Articles de revues sur le sujet « Geothermal resource »
Pour voir les autres types de publications sur ce sujet consultez le lien suivant : Geothermal resource.
Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres
Consultez les 50 meilleurs articles de revues pour votre recherche sur le sujet « Geothermal resource ».
À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.
Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.
Parcourez les articles de revues sur diverses disciplines et organisez correctement votre bibliographie.
1
Hermanto, Agus. « Modeling of geothermal energy policy and its implications on geothermal energy outcomes in Indonesia ». International Journal of Energy Sector Management 12, no 3 (3 septembre 2018) : 449–67. http://dx.doi.org/10.1108/ijesm-11-2017-0011.
Texte intégralRésumé :
Purpose This study aims to improve the performance of geothermal energy. Therefore, this research requires a deep examination of the determinant factors that affect the performance of geothermal energy; the results of this study are expected to increase the outcomes that can be enjoyed by the people of Indonesia. Design/methodology/approach This research uses quantitative approach. Data are obtained via questionnaires. The population in this study is all stakeholders of the national geothermal energy policy throughout the region. The stakeholders in question are the Community Care for Energy and the Environment (MPEL), using a sample of 400 respondents. The variables used were human resource capacity (X1), political resource capacity (X2), economic resource capacity (X3), social resource capacity (X4), performance of geothermal energy policy (Y1) and geothermal energy policy outcomes (Y2). Data analysis used to solve hypothetical model built in this research is partial least square. Findings While human resource, political resource, economic resource and social resource capacities affect the performance of geothermal energy policy, those capacities directly affect the performance of geothermal energy policies. On the other hand, the results of the indirect effect test show that with the mediation of good geothermal energy policy, it will be seen that the effect of human resource capacity, political resource capacity, capacity of economic resources and the capacity of social resources to the utilization of geothermal energy. The utilization of geothermal energy cannot be directly felt by the community without the support of the formulation of geothermal energy policy or unless it is supported by high human resources, political resources, economic resource and social resource capacities. Originality/value No previous research has comprehensively examined the effect of human resource, political resource, economic resource and social resource capacities on geothermal energy policy and its implications for the outcomes of geothermal energy policy.
2
Zhu, Huan Lai, Shang Ming Shi, Chun Bo He et Xiao Meng Fang. « Study on the Oilfield Produced Water Geothermal Resource Utilization ». Advanced Materials Research 524-527 (mai 2012) : 1284–88. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.1284.
Texte intégralRésumé :
Oilfield produced water geothermal resource that is very easy overlooked or wasted in the exploitation of oilfield geothermal resources is a special form of sedimentary basin geothermal resource. Based on detailed analysis of oilfield produced water geothermal resource formation mechanism, its concept is firstly proposed. The paper expounds oilfield produces water geothermal resource characteristics from three aspects of resource potential, development cost and market prospect, proposes the idea of using heat and adverse water, discusses the feasibility of development water geothermal resource to service in oil production and circumjacent dweller by using heat pump technology and lays a solid foundation for its in-depth exploitation.
3
Dai, Peng, Kongyou Wu, Gang Wang, Shengdong Wang, Yuntao Song, Zhenhai Zhang, Yuehan Shang, Sicong Zheng, Yinsheng Meng et Yimin She. « Geothermal Geological Characteristics and Genetic Model of the Shunping Area along Eastern Taihang Mountain ». Minerals 12, no 8 (22 juillet 2022) : 919. http://dx.doi.org/10.3390/min12080919.
Texte intégralRésumé :
Knowledge about subsurface geological characteristics and a geothermic genetic model plays an essential role in geothermal exploration and resource assessment. To solve the problem in the Shunping area along eastern Taihang Mountain, geothermal geological conditions were analyzed by geophysical, geochemical, and geological methods, such as magnetotelluric, gas geochemistry, and structural analysis. The geothermic genetic model was developed by analyzing the characteristics of the heat source, water source, migration channel, reservoir, and cap rock of the geothermal geological conditions. Favorable deep thermal conduction conditions and sufficient atmospheric precipitation in the study area provide an original heat source and water supply for geothermal formation. The faults and unconformities of different scales have become effective channels for the migration of underground hot water. The thermal reservoir formed by marine carbonate rocks with karst fissure development provides suitable space for the storage of underground hot water. Although the Cenozoic strata have good thermal insulation and water insulation function, the thermal insulation and water insulation effect is not ideal because of the shallow coverage in the Shunping area and the damage by tectonic action, which affected thermal insulation and water insulation to some extent, restricting the practical preservation of underground heat energy in the Shunping area. The bedrock geothermal resource in the Shunping area is original from the combined action of multiple indexes of source, transport, reservoir, and cap. The geothermal geologic conditions of source and reservoir in the Shunping area are very similar to those in the Xiongan new area, and have obvious advantages in hydrodynamic conditions. Although limited by the cap’s effectiveness, the geothermal resources in the Shunping area can provide some clean energy support for local production and life, thereby satisfying economic development conditions and encouraging further geological exploration.
4
Fauzi, A. « Geothermal resources and reserves in Indonesia : an updated revision ». Geothermal Energy Science 3, no 1 (17 février 2015) : 1–6. http://dx.doi.org/10.5194/gtes-3-1-2015.
Texte intégralRésumé :
<p><strong>Abstract.</strong> More than 300 high- to low-enthalpy geothermal sources have been identified throughout Indonesia. From the early 1980s until the late 1990s, the geothermal potential for power production in Indonesia was estimated to be about 20 000 MWe. The most recent estimate exceeds 29 000 MWe derived from the 300 sites (Geological Agency, December 2013). <br><br> This resource estimate has been obtained by adding all of the estimated geothermal potential resources and reserves classified as "speculative", "hypothetical", "possible", "probable", and "proven" from all sites where such information is available. However, this approach to estimating the geothermal potential is flawed because it includes double counting of some reserve estimates as resource estimates, thus giving an inflated figure for the total national geothermal potential. <br><br> This paper describes an updated revision of the geothermal resource estimate in Indonesia using a more realistic methodology. The methodology proposes that the preliminary "Speculative Resource" category should cover the full potential of a geothermal area and form the base reference figure for the resource of the area. Further investigation of this resource may improve the level of confidence of the category of reserves but will not necessarily increase the figure of the "preliminary resource estimate" as a whole, unless the result of the investigation is higher. A previous paper (Fauzi, 2013a, b) redefined and revised the geothermal resource estimate for Indonesia. The methodology, adopted from Fauzi (2013a, b), will be fully described in this paper. As a result of using the revised methodology, the potential geothermal resources and reserves for Indonesia are estimated to be about 24 000 MWe, some 5000 MWe less than the 2013 national estimate.</p>
5
Yang, Peng, Qiang Guo et Delong Zhang. « Survey on Geothermal Resources in Zhangjiakou Area ». E3S Web of Conferences 350 (2022) : 02007. http://dx.doi.org/10.1051/e3sconf/202235002007.
Texte intégralRésumé :
The Zhangjiakou area is rich in geothermal resources, and many counties in the region have discovered low-temperature geothermal. Structurally, Huailai County, Zhangjiakou City is located at the intersection of Zhangjiakou-Penglai Fault Zone and Shanxi Fault Basin (or Fenwei Seismic Tectonic Zone), namely the Yanqing-Huailai Basin (Yanhuai Basin). A large amount of geothermal resource investigation and research works has preliminarily defined that the area has good geothermal resource accumulation conditions. From 2019 to 2020, the China Geological Survey has organized several investigation and research in the area for in-depth geothermal resource. As one method of the survey results verification, a parameter well for geothermal resource survey was deployed as ZK02 and completed at 3000m depth. The ZK02 well was completed at a depth of 3006.9m, drilling through the Quaternary, Neogene, and Jixian strata, and entered the Archean gneiss strata. The well successfully explored high-quality artesian heat storage in the Jixian strata, obtained deep geothermal geological data and physical data, revealed the regional stratigraphic sequence and geological structure characteristics, and provided a scientific basis for regional geothermal resource potential evaluation. Based on the engineering practice of ZK02 well, this paper systematically summarizes drilling technology and experience from well structure to drilling equipment, construction technology and key technology, analyses the complex conditions and countermeasures downhole, and provide reference for the follow-up regional geothermal resources investigation, research and development and.
6
He, Yujiang, Guiling Wang, Wenjing Lin et Wei Zhang. « The Analysis of Heat Storage Capacity and the Formation Characteristics of Geothermal Resources in Sedimentary Basins —— A Case Study on Dunhuang Basin ». Open Fuels & ; Energy Science Journal 8, no 1 (31 mars 2015) : 73–76. http://dx.doi.org/10.2174/1876973x01508010073.
Texte intégralRésumé :
The geothermal resources in sedimentary basin are affected by many factors because the characteristic of geothermal reservoirs is very complex, so the heat storage capacities are hard to calculate. This paper took Dunhuang Basin as an example to analyze the geological structure, stratigraphic structure and the formation mechanism of geothermal water based on the formation characteristics of the geothermal resources. The analysis results showed the geothermal reservoir parameters, including the area, thickness, and temperature of the geothermal reservoir, and porosity, etc. Based on geothermal reservoir model, the conclusion was that the geothermal resource of Dunhuang Basin was 7.75E+16kJ. The results provided an advice for the exploitation of geothermal resources in sedimentary basins.
7
Li, Qi Min. « The Cascaded Utilization of Geothermal Resources ». Applied Mechanics and Materials 178-181 (mai 2012) : 131–34. http://dx.doi.org/10.4028/www.scientific.net/amm.178-181.131.
Texte intégralRésumé :
The geothermal resource is a clean complex resource, which can be changed into sustainable energy guided by the science theories. Demonstrating the heating engineering of a immigration village in Tianjin, the intention of this paper is to survey the sustainable utilization of geothermal resource meeting basic heating load, containing: (1) the dynamic prediction technologies of the production–reinjection of geothermal wells; (2) the design of inclined geothermal well; (3) the technologies of cascaded utilization of geothermal resource; and (4) the project appraisal. The results show geothermal resource is sustainable, and yield good economic returns and social benefits.
8
Rybach, Ladislaus. « Geothermal Sustainability or Heat Mining ? » International Journal of Terrestrial Heat Flow and Applications 4, no 1 (22 mars 2021) : 15–25. http://dx.doi.org/10.31214/ijthfa.v4i1.61.
Texte intégralRésumé :
Heat mining” is, in fact a complete deceptive misnomer. When a mineral deposit (e.g. copper) is mined and the ore has been taken out, it will be gone forever. Not so with geothermal resources: The heat and the fluid are coming back! Namely, the heat and fluid extraction create heat sinks and hydraulic minima; around these, strong temperature and pressure gradients develop. Along the gradients, natural inflow of heat and fluid arises to replenish the deficits. The inflow from the surroundings can be strong: around borehole heat exchangers, heat flow densities of several W/m2 result, whereas terrestrial heat flow amounts only to about 50 – 100 mW/m2.
The regeneration of geothermal resources after production, in other words, extraction of fluid and/or heat) is a process that runs over different timescales, depending on the kind and size of the utilization system, the production rate, and the resource characteristics. The resource renewal depends directly on the heat/fluid backflow rate. Heat, respectively fluid production from geothermal resources can be accomplished with different withdrawal rates. Although forced production is more attractive financially (with quick payback), it can nevertheless degrade the resource permanently. The longevity of the resource (and thus the sustainability of production) can be ensured by moderate production rates. The sustainable geothermal production level depends on the utilization technology as well as on the local geologic conditions. The stipulation of the sustainable production level requires specific clarifications, especially by numerical modelling, based on long-term production strategies. In general, resource regeneration proceeds asymptotically: strong at the beginning and slowing down subsequently, reaching the original conditions only after infinite time. However, regeneration to 95 % can be achieved much earlier, e.g. within the lifetime of the extraction/production system. In other words, geothermal resources may under certain circumstances may be considered as having potential regrowth, like biomass. Concerning the requirements for such sustainable production, it is convenient to consider four resource types and utilization schemes. These may be treated by numerical model simulations that consider heat extraction by geothermal heat pumps, hydrothermal aquifer, used by a doublet system for space heating, high enthalpy two-phase reservoir, tapped to generate electricity, and enhanced Geothermal Systems (EGS).
9
Rawat, Piyush, et J. P. Kesari. « Geothermal Energy Resource of North-western Himalayas ». International Journal of Advance Research and Innovation 6, no 3 (2018) : 112–15. http://dx.doi.org/10.51976/ijari.631817.
Texte intégralRésumé :
Geothermal energy came into the picture after the oil crisis in the 1970s, with proper research and exploration took place in 1973. India's geothermal potential is entirely undeveloped with a power potential of 10,600 MWe. The capital cost of generating energy from geothermal sources in India is estimated to be US$1.6–2.0 million per MW, but the operating cost is minimal. This paper discusses geothermal heat source of different provinces of Jammu and Kashmir and Himachal Pradesh, with its direct use for production of electricity.
10
GUO, Jianci, Peng ZHOU, Zhongyan WAN, Yueting XIAO et Lianhe ZHOU. « Current Situation and Suggestions for work of Geothermal Resources Development and Utilization in Tibe ». Chinese Earth Sciences Review 1, no 1 (28 septembre 2022) : 1–9. http://dx.doi.org/10.48014/cesr.20220908001.
Texte intégralRésumé :
Geothermal energy is a kind of renewable and clean energy.It has unique and significant advantages in the energy family.The effective development and utilization of geothermal resources is of great significance to help achieve the strategic goal of “double carbon”.The Tibet Autonomous Region has abundant and high-quality geothermal resources,and is one of the few areas in China suitable for large-scale development of geothermal power generation,central heating and cascade comprehensive utilization.This paper systematically analyzes the characteristics of geothermal heat flow in Tibet,and concludes that Tibet has great prospects for finding high-temperature geothermal resources and is an important direction for geothermal exploration.It also elaborates on the distribution characteristics,resource potential and current development and utilization of geothermal resources in Tibet,and puts forward opinions and suggestions for promoting the high-quality development of geothermal resources in the region.
11
Kundu, Arijit. « Geothermal Resource Exertion : Indian Scenario ». IOP Conference Series : Materials Science and Engineering 377 (juin 2018) : 012018. http://dx.doi.org/10.1088/1757-899x/377/1/012018.
Texte intégral
12
Moore, Glenis. « Geothermal energy. A natural resource ». Electronics and Power 32, no 3 (1986) : 217. http://dx.doi.org/10.1049/ep.1986.0143.
Texte intégral
13
Lee, Youngmin, Sungho Park, Jongchan Kim, Hyoung Chan Kim et Min-Ho Koo. « Geothermal resource assessment in Korea ». Renewable and Sustainable Energy Reviews 14, no 8 (octobre 2010) : 2392–400. http://dx.doi.org/10.1016/j.rser.2010.05.003.
Texte intégral
14
Trota, Ferreira, Gomes, Cabral et Kallberg. « Power Production Estimates from Geothermal Resources by Means of Small-Size Compact Climeon Heat Power Converters : Case Studies from Portugal (Sete Cidades, Azores and Longroiva Spa, Mainland) ». Energies 12, no 14 (23 juillet 2019) : 2838. http://dx.doi.org/10.3390/en12142838.
Texte intégralRésumé :
Renewable forms of energy are increasingly penetrating the electricity market, particularly, geothermal energy. A wide range of resource temperatures and fluid quality are converted mostly using traditional binary power plants and, recently, using Climeon modular units. Portuguese natural geothermal resources are far from precise estimations. Despite the parameter uncertainties, electric power resource estimations of two natural geothermal reservoirs are presented: a volcanic sourced heated high-enthalpy geothermal reservoir in Sete Cidades, São Miguel Island, Azores; and a low-enthalpy geothermal reservoir linked to a fractured zone in a granitic setting in Longroiva, in the northern part of the Portuguese mainland. Based on the volumetric method, we assessed the power potential of geothermal resources in Sete Cidades and Longroiva using a probabilistic methodology—Monte Carlo simulation. The average reserve estimations for Climeon module were 5.66 MWe and 0.64 MWe for Sete Cidades and Longroiva, respectively. This figure was by far higher when compared to traditional binary technology; those differences were mostly attributed to distinct conversions efficiency factors.
15
Hamza, Valiya Mannathal, Fábio Pinto Vieira, Suze Nei Pereira Guimarães et Jorge Luiz dos Santos Gomes. « Geothermal Resources of the Asian Continent : A regional Assessment ». International Journal of Terrestrial Heat Flow and Applications 5, no 1 (2 avril 2022) : 26–33. http://dx.doi.org/10.31214/ijthfa.v5i1.85.
Texte intégralRésumé :
The present work is an attempt for regional assessment of geothermal resources of the continental region of Asia. It is based on integrated analysis of the results of experimental data on heat transfer by conduction as well as hydrothermal and magmatic processes in the upper crust. The current compilation makes use of geothermal data reported at the website of IHFC but also estimates based on available information on occurrences thermal springs and volcanic events. The resource assessment has been carried out for 11260 sites distributed in 46 countries. A modified method of magmatic heat budget (MHB) has been employed in deriving estimates of geothermal resources in areas of recent volcanic activity. These datasets were reevaluated and spatially gridded using kigrid interpolation to construction of regional distribution maps of geothermal resources and interpreted on the basis of available information on tectonic setting and geological characteristics. According to results obtained the total resource base (RB) is estimated to be 47024 ± 4525 GJ. The mean resource base per unit area (RBUA) is 1765 GJ. The most prominent features in geothermal maps are the significantly high values of resource base of greater than 1000 GJ in countries such as Japan, Indonesia, China, Bhutan, Nepal and Pakistan. In addition, vertical distributions of temperatures were calculated in such areas for depths reaching down to 6 km. The results obtained indicate potential availability of high temperature resources in vast regions of the Asian continent.
16
Webster, Stuart, et Sandip Patel. « The Petroleum and Geothermal Energy Resources (Resource Management and Administration) Regulations 2013 ». APPEA Journal 54, no 1 (2014) : 373. http://dx.doi.org/10.1071/aj13038.
Texte intégralRésumé :
These Regulations have been proposed under the Petroleum and Geothermal Energy Resources Act 1967 to replace the existing Schedule of Onshore Petroleum Exploration and Production Requirements 1991 (Amended 21 May 2010). The Department of Mines and Petroleum (DMP) is the agency that administers the regulations on behalf of the Minister and keeps the Minister informed of petroleum or geothermal energy resource activities. A draft was released on 5 April 2014 for public comment. The precise form and language of the proposed Regulations may change after public consultation, but the intent of the regulations will remain the same. The regulations will provide the framework for administration and compliance for petroleum field developments, geothermal energy projects, well construction and data submission and release. Activities are expected to be carried out in accordance with good oilfield practice and be compatible with the optimum long-term recovery of petroleum or geothermal energy. The Resource Management and Administration Regulations (RMA) have moved from a prescriptive type of regime to an objectives-based risk management regime requiring operators to manage their operations ensuring world’s leading practice and a fit-for-purpose design. It is expected that operators will apply the relevant standards appropriate for their activities. It is understood also that technology will change and that standards might be changed to embrace the new technology. It is this factor that makes objectives-based regulation more apt than prescription-based regulation. Another factor is that prescription is unlikely to cover every possible circumstance that might occur. The focus is on a whole-of-life approach to exploration and development, from an initial exploration process, through any well interventions all the way to final decommissioning. This includes requiring titleholders to consider what maintenance and monitoring programs will be in place throughout the life of wells and to be ready for eventual decommissioning. The DMP has a continuous improvement process which involves monitoring developments in regulation worldwide. Published papers on drilling, completion, hydraulic stimulation, cementing and production on both conventional reservoirs and also shale and tight sands have been, and continue to be, researched to ensure that the regulations cover all aspects of petroleum and geothermal resource development.
17
Zhang, Delong, Qiang Guo, Peng Yang, Tong Lu, Yunchao He, Wei Weng et Baolin Liu. « Development, Application and Prospect of Comprehensive Logging Technology in Geothermal Drilling ». E3S Web of Conferences 350 (2022) : 02003. http://dx.doi.org/10.1051/e3sconf/202235002003.
Texte intégralRésumé :
With the continuous acceleration of the exploration and development progress of geothermal (hot dry rock) resources, the workload of geothermal resource investigation and drilling has increased sharply, but the research and application of comprehensive logging technology is relatively lagging behind in China. This article analyses the response relationship of various logging data to geothermal geological conditions item by item, introduces the development and application status of logging technology at home and abroad, and takes HR-1 well as an example to give a brief introduction and analysis of the comprehensive logging technology. Theory and practice have proved that the comprehensive logging can provide an important reference and scientific basis for the evaluation of the potential of geothermal reserves. The development and application status of the geothermal logging technology in China can no longer meet the needs of geothermal resource exploration and development. It is imperative to carry out in-depth research on geothermal logging technology and further increase its application.
18
Ba, Jun Jie, Shi Guang Xu et Chen Chen Li. « Application of Comprehensive Geophysical Prospecting Method to Geothermal Resource Exploration in Yiliang County, Kunming ». Applied Mechanics and Materials 707 (décembre 2014) : 299–302. http://dx.doi.org/10.4028/www.scientific.net/amm.707.299.
Texte intégralRésumé :
The earth is a huge heat reservoir and contains amounts of heat. The geothermal internal heat is about50000 times more than the energy in the oil and gas resources. In order to investigate the occurrence and formation of geothermal resources in Yiliang basin, several methods, such as electrical sounding, Very low frequency electromagnetic method, and Electrostatic α-card method are applied in the exploration area. The geothermal resource survey of the Yiliang basin has been carried out. Based on the above results, two investigation wells have been designed at the location of favorable geological conditions in the exploration area. The application of multiple geophysical prospecting methods obtains preferable effort in geothermal exploration and provides meaningful reference for the area with lower level of the geothermal survey work.
19
Wahyudi, Noeroso L. « A Comparative Global Geothermal Development Analysis : Indonesia Investment Perspective ». Information Management and Business Review 9, no 5 (30 novembre 2017) : 43–51. http://dx.doi.org/10.22610/imbr.v9i5.1963.
Texte intégralRésumé :
One of the current suggestions on low global oil price is a good momentum to optimize utilization of geothermal resources as renewable energy. Meanwhile, Government and donors countries have partnership experiences to remove some barriers such as legal framework on business process for attracting private sectors to invest in geothermal project financing. An explorative analysis on comparative global geothermal development based on Indonesia investment perspective is methodology of this paper. As a qualitative-descriptive paper, this method focused on literature review to obtain literature or secondary data. The data used are secondary data obtained from various sources, such as Ministry of Energy and Mineral Resources (MEMR), Ministry of Finance, PT PLN as well as a range of research and other resources accessed through the internet. The goal of these explorations to find some lessons learned which might be used by the GoI to utilize its largest world potential of geothermal resources more transparent, efficiently, and effectively. Based on global geothermal development current status shows that the role of private companies in Indonesia position is the second-ranking on share geothermal utilization. Unfortunately, Indonesia position on the share of resource to potential utilization is in the third-ranking compare to six leading geothermal countries. This means that Indonesia has the opportunity to scale up its resource potential utilization. Managing this opportunity, the GoI should continue its experience to support and guarantee private companies business process strategically.
20
Tang, Yanhong, et Xiangyang Deng. « Economic and Environmental Impacts of Geothermal Resource Development in Hunan, China ». International Journal of Heat and Technology 39, no 2 (30 avril 2021) : 581–86. http://dx.doi.org/10.18280/ijht.390228.
Texte intégralRésumé :
The global warming and soaring energy consumption have motivated many scholars and policymakers to pursue energy conservation and environmental improvement. As a renewable cleaning energy, geothermal resources have been actively developed in recent years. Taking six geothermal projects in Hunan, China as examples, this paper determines the input and output indices for each project. The input indices cover both economic and environmental dimensions. Then, the authors deeply explored how much geothermal resource quantity, single-well yield, total investment, and annual cost investment influence dynamic investment recovery period, coal reduction of summer operation, coal reduction of winter operation, environmental protection and energy saving, standard coal reduction, and emission reduction. The results show that total investment, single-well yield, and total investment have significant effects on economic indices, while geothermal resource quantity, single-well yield, and total investment have significant effects on environmental indices.
21
Xu, Zhi-He, Zhen-Jun Sun, Wei Xin et Liping Zhong. « Geothermal resource potential assessment of Erdaobaihe, Changbaishan volcanic field : Constraints from geophysics ». Open Geosciences 13, no 1 (1 janvier 2021) : 1053–63. http://dx.doi.org/10.1515/geo-2020-0282.
Texte intégralRésumé :
Abstract Geothermal resources occurring in the Changbaishan volcanic field are directly or indirectly controlled by volcanic activity and exhibit a close correlation with deep-seated faults. Energy and thermal transfer are generally controlled by groundwater circulation and hot gas emission. This article considers the detectability of hot water and gas by geophysical methods. The controlled source acoustic magnetotelluric (CSAMT) and radon (222Rn) gas methods give straightforward information on electrical resistivity and natural radon emissions, respectively, to assess the geothermal condition. The CSAMT method detected five-banded low-apparent resistivity bodies (decreasing from 3,000 to 300 Ωm), indicating that there exists a high degree of water-bearing capacities in the subsurface. The radon (222Rn) gas concentrations were monitored in two rapid growth zones: one zone showing values ranging from 3,000 to 23,000 Bq/m3, and the other with values from 4,000 to 24,000 Bq/m3. These changes demonstrate that the heat energies available in these areas were very high and that there is potential for geothermal resources in those zones. Combining with previously published data from geothermometry and geothermal drilling, we argue that there is great potential in Erdaobaihe for geothermal exploitation and that the geothermal resource type should be classified into uplift mountain geothermal system no magma type.
22
Axelsson, G. « Tracer tests in geothermal resource management ». EPJ Web of Conferences 50 (2013) : 02001. http://dx.doi.org/10.1051/epjconf/20135002001.
Texte intégral
23
Sinuhaji, Adrian Rizki, et Yudha Herlambang. « Characterizing Unggaran Geothermal Resource Potential in Central Java : Application of Gedongsongo Manifestations Evaluation ». KnE Energy 2, no 2 (1 décembre 2015) : 1. http://dx.doi.org/10.18502/ken.v2i2.350.
Texte intégralRésumé :
<p>Geothermal power is extracted from heat stored in the earth. This paper discusses the use of geothermal energy in our electrical power systems and potential development in Central Java. Gedongsongo surface manifestations of the Ungaran geothermal prospect in Central Java have high temperature properties, (72 to 87) ºC, pH 2 to pH 6 and 770 g/kg of chloride. Geothermal power plant is very compatible built in Gedongsongo. At present, the development of geothermal resources as renewable energy have to be primarily focused on utilization of ground source heat pumps which can make good use of the enormous low temperature geothermal resources. </p><p><strong>Keywords</strong>: Central Java; Geothermal; renewable energy</p>
24
Wang, Lei, Lihua Zuo et Changming Zhu. « Tracer Test and Streamline Simulation for Geothermal Resources in Cuona of Tibet ». Fluids 5, no 3 (3 août 2020) : 128. http://dx.doi.org/10.3390/fluids5030128.
Texte intégralRésumé :
The exploration and production of geothermal energy have been important missions for the energy contribution of the world, especially because geothermal energy is one environmentally friendly resource. The geothermal resources exist around the world but there are differences in the exploration and production procedures depending on the geophysical properties and brine temperatures in each reservoir. There are plenty of geothermal reservoirs in southwest China but the subsurface situations are so complicated that it is hard to produce the geothermal resource economically and in an environmentally friendly way. In this paper, we summarized the current situations of the geothermal exploration in Cuona and studied the impact of injection wells on the geothermal production performance. Tracer tests were performed to test the connections between three injection wells and two production wells and the streamline algorithm based on Complex Analysis Potential methods is applied to simulate the trajectories and running time of the water from the injection well. The tracer test results were analyzed to get possible interconnection relations between different wells. The most reasonable subsurface conditions including porosity and faults locations were investigated. The technique proposed here could be extended and applied for other geothermal projects in China and other countries in the world.
25
Wang, An Dong, Zhan Xue Sun, Bao Qun Hu, Jin Hui Liu et Cheng Dong Liu. « Guangdong, a Potential Province for Developing Hot Dry Rock Geothermal Resource ». Applied Mechanics and Materials 492 (janvier 2014) : 583–85. http://dx.doi.org/10.4028/www.scientific.net/amm.492.583.
Texte intégralRésumé :
In the past decades, the study on Hot Dry Rock (HDR) geothermal resource has been a hot topic. A large number of investigations confirm that electricity power generated from HDR is feasible and suggest that HDR geothermal source is a kind of local and renewable energy. Up no now, many countries have carried out HDR experiments. As a large energy consumption country, China will also develop HDR geothermal energy in the near future. In the present study, our preliminary data potentially suggest that Guangdong province have great potential to develop HDR geothermal applications.
26
Zhu, Jie, Sheng Jin, Yang Yang et Tianyu Zhang. « Geothermal Resource Exploration in Magmatic Rock Areas Using a Comprehensive Geophysical Method ». Geofluids 2022 (28 janvier 2022) : 1–12. http://dx.doi.org/10.1155/2022/5929324.
Texte intégralRésumé :
Geothermal resources have significant development and usage potential. It is critical to conduct geological investigation of geothermal resources prior to mining, so as to deepen our knowledge and comprehension of geothermal resources. Ground water is heated by magmatic rocks and geothermal resources can be created in magmatic rock areas. However, their communication is weak, and the depth of burial is typically great. It is difficult for traditional geophysical methods, such as induced polarization method, to achieve useful exploration depths, and they have low accuracy. In this article, a comprehensive geophysical method, based on the controlled source audio-frequency magnetotelluric method (CSAMT) and transient electromagnetic method (TEM), is applied to geothermal exploration in a magmatic rock area. This method compensates for the shortcomings of a single method and achieves a good exploration effect, thereby providing a reliable geological foundation for further development and utilization of geothermal resources.
27
Jatmiko, Bambang Wahyu, Muhamad Hasbi Assiddiqy, Prajamukti Ediatmaja, Ricky Prabowo, Sutopo, Heru Berian Pratama et Muhamad Ridwan Hamdani. « Resource Assessment of Ungaran Geothermal Field Using Numerical model and Monte Carlo Simulation ». IOP Conference Series : Earth and Environmental Science 1031, no 1 (1 mai 2022) : 012021. http://dx.doi.org/10.1088/1755-1315/1031/1/012021.
Texte intégralRésumé :
Abstract A careful decision needs a comprehensive and effective way to estimate the subsurface condition and the possible resource contained in the geothermal system. Numerical model and simulation sum up the result of geoscience study and its correlation to the behavior of the subsurface fluid flows. A well-developed numerical simulation could give a thorough analysis of a geothermal system and be utilized as input parameters to apply the resource assessment method. This study applied the numerical simulation to the Ungaran geothermal field using TOUGH2 reservoir simulation software. Several parameters were referring to these simulation results and used as the input parameters to the resource assessment method using Monte Carlo simulation. The result shows that the resource value with the highest confidence is lower than the earlier resource estimation of the Ungaran Geothermal System, which is only based on geoscience study. This study gives a careful analysis to support decision-making, especially in a geothermal green field.
28
Bujanská, Alena, et László Böszörményi. « The Idea of an Innovated Concept of the Košice Geothermal Project ». Selected Scientific Papers - Journal of Civil Engineering 10, no 2 (1 novembre 2015) : 69–80. http://dx.doi.org/10.2478/sspjce-2015-0019.
Texte intégralRésumé :
Abstract Slovakia has very limited amounts of fossil resources. However, it has a relatively high potential of geothermal energy which use is far below its possibilities. The most abundant geothermal resource, not only in Slovakia but throughout the central Europe, is Košice basin. Since the publication of the first ideas about the ambitious goal to exploit the geothermal potential of this site, 20 years has passed and three geothermal wells has been made but without any progress. In the article the authors present the idea of a fundamental change in the approach to improve the energy and economic efficiency of the project.
29
Kaven, J. O., D. C. Templeton et Arpita P. Bathija. « Introduction to this special section : Geothermal energy ». Leading Edge 39, no 12 (décembre 2020) : 855–56. http://dx.doi.org/10.1190/tle39120855.1.
Texte intégralRésumé :
Geothermal energy is a global renewable resource that has the potential to provide a significant portion of baseload energy in many regions. In the United States, it has the potential to provide 8.5% of the electric generation capacity by the middle of the century. In general, geothermal systems require heat, permeability, and water to be viable for energy generation. However, with current technologies, only heat is strictly necessary in a native system. Engineered geothermal systems (EGS) introduce water into the subsurface at elevated pressures and reduced temperatures and enhance permeability through hydraulic and/or shear fracturing. Additionally, although moderate- to high-temperature resources currently dominate geothermal energy production, low-temperature resources have been utilized for direct-use cases. When well balanced and maintained, geothermal resources can produce significant amounts of heat and achieve long-term sustainability on the order of an estimated tens to hundreds of years.
30
Liu, Hong Bin, Yong Sheng Shi, Lei Zhang et Ming Qiu. « Present Situation of Exploitation and Utilization of Geothermal Resources in China ». Applied Mechanics and Materials 541-542 (mars 2014) : 911–15. http://dx.doi.org/10.4028/www.scientific.net/amm.541-542.911.
Texte intégralRésumé :
Geothermal energy provides the renewable energy sector with an opportunity to produce base load power, whilst meeting current government objectives of many countries in relation to greenhouse gas emission and renewable energy portfolio standards. The utilization of geothermal power develops well in many developed countries, such as America, Japan, France, Italy, Iceland, etc. But it is still at an early stage in China. The development of alternative energy such as geothermal energy is as a basic national policy. It is also an important issue for China how to make good use of geothermal resource currently. In this paper, according to the distribution, we introduce the development and utilization of Chinese geothermal resources.
31
Zafar, S. Daniel, et Bruce L. Cutright. « Texas’ geothermal resource base : A raster-integration method for estimating in-place geothermal-energy resources using ArcGIS ». Geothermics 50 (avril 2014) : 148–54. http://dx.doi.org/10.1016/j.geothermics.2013.09.003.
Texte intégral
32
Armandine Les Landes, Antoine, Théophile Guillon, Mariane Peter-Borie, Arnold Blaisonneau, Xavier Rachez et Sylvie Gentier. « Locating Geothermal Resources : Insights from 3D Stress and Flow Models at the Upper Rhine Graben Scale ». Geofluids 2019 (12 mai 2019) : 1–24. http://dx.doi.org/10.1155/2019/8494539.
Texte intégralRésumé :
To be exploited, geothermal resources require heat, fluid, and permeability. These favourable geothermal conditions are strongly linked to the specific geodynamic context and the main physical transport processes, notably stresses and fluid circulations, which impact heat-driving processes. The physical conditions favouring the setup of geothermal resources can be searched for in predictive models, thus giving estimates on the so-called “favourable areas.” Numerical models could allow an integrated evaluation of the physical processes with adapted time and space scales and considering 3D effects. Supported by geological, geophysical, and geochemical exploration methods, they constitute a useful tool to shed light on the dynamic context of the geothermal resource setup and may provide answers to the challenging task of geothermal exploration. The Upper Rhine Graben (URG) is a data-rich geothermal system where deep fluid circulations occurring in the regional fault network are the probable origin of local thermal anomalies. Here, we present a current overview of our team’s efforts to integrate the impacts of the key physics as well as key factors controlling the geothermal anomalies in a fault-controlled geological setting in 3D physically consistent models at the regional scale. The study relies on the building of the first 3D numerical flow (using the discrete-continuum method) and mechanical models (using the distinct element method) at the URG scale. First, the key role of the regional fault network is taken into account using a discrete numerical approach. The geometry building is focused on the conceptualization of the 3D fault zone network based on structural interpretation and generic geological concepts and is consistent with the geological knowledge. This DFN (discrete fracture network) model is declined in two separate models (3D flow and stress) at the URG scale. Then, based on the main characteristics of the geothermal anomalies and the link with the physics considered, criteria are identified that enable the elaboration of indicators to use the results of the simulation and identify geothermally favourable areas. Then, considering the strong link between the stress, fluid flow, and geothermal resources, a cross-analysis of the results is realized to delineate favourable areas for geothermal resources. The results are compared with the existing thermal data at the URG scale and compared with knowledge gained through numerous studies. The good agreement between the delineated favourable areas and the locations of local thermal anomalies (especially the main one close to Soultz-sous-Forêts) demonstrates the key role of the regional fault network as well as stress and fluid flow on the setup of geothermal resources. Moreover, the very encouraging results underline the potential of the first 3D flow and 3D stress models at the URG scale to locate geothermal resources and offer new research opportunities.
33
Yin, Zhibin, Xuan Li, Changsheng Huang, Wei Chen, Baoquan Hou, Xiaozhe Li, Wenjing Han et al. « Analysis of the Formation Mechanism of Medium and Low-Temperature Geothermal Water in Wuhan Based on Hydrochemical Characteristics ». Water 15, no 2 (5 janvier 2023) : 227. http://dx.doi.org/10.3390/w15020227.
Texte intégralRésumé :
Wuhan and its surrounding areas have obvious geothermal spring outcrops, which are unexplored potential geothermal resources. The degree of geothermal resource development in Wuhan is low, and there is a lack of systematic research on their hydrochemical characteristics and formation mechanism. The Wuhan area is bounded by the Xiang-Guang fault, the South Qinling-Dabie orogenic belt in the north, and the Yangtze landmass in the south, with Silurian and Quaternary outcrops and little bedrock outcrops. The Silurian is the main water barrier in the region, which separates the upper Triassic and Paleogene as shallow aquifers and the lower Cambrian and Ordovician as deep aquifers. Different strata are connected by a series of fault structures, which constitute Wuhan’s unique groundwater water-bearing system. Eleven geothermal water (23~52 °C) and six surface water samples (around 22 °C) were collected from the study area. The geothermal water in the study area is weakly alkaline, with a pH of 7.04~8.24. The chemical type of geothermal water is mainly deep SO42− with a higher TDS and shallow HCO3− type water with a lower TDS. Isotopic analysis indicates that atmospheric precipitation and water-rock interaction are the main ionic sources of geothermal water. The chemical composition of geothermal water is dominated by ion-exchange interactions and the dissolution of carbonates and silicates. The characteristic coefficients, correlation analysis, water chemistry type, recharge elevation, geothermal water age, reservoir temperature, and cycle depth were also analyzed. The performance was similar in the same geothermal reservoir, which could be judged as an obviously deep and shallow geothermal fluid reservoir, and the genetic conceptual model of Wuhan geothermal was preliminarily deduced. DXR-8 and DXR-9 had the best reservoir conditions, hydrodynamic conditions, rapid alternation of water bodies, and large circulation depth, which is a favorable location for geothermal resource development and will bring considerable economic and social benefits.
34
Gao, Cheng, Le Zhang, Chuanxiang Sun et Jiayuan He. « The Numerical Simulation of Heat and Mass Transfer on Geothermal System-A Case Study in Laoling Area, Shandong, China ». Mathematical Problems in Engineering 2022 (25 mai 2022) : 1–11. http://dx.doi.org/10.1155/2022/3398965.
Texte intégralRésumé :
Geothermal resources have become increasingly attractive and promising because of their abundant resource base and environmental protection, especially for hydrothermal resources, which are widely developed for heating in winter. It is indicated that numerical simulation is an important tool for high efficiency geothermal system development. Compared with other methods, numerical simulation is a more comprehensive, scientific, and effective method in the evaluation of recoverable resources and the formulation of development plans. However, there are some problems in the existing software, such as deviation in physical property calculation, incomplete multifields coupling, and poor applicability for low-permeability reservoir and large-scale models. Therefore, based on the optimized multiphysics coupling mathematical model and MPI architecture, a simulator for a multiphysics-coupling geothermal system (SMG) was developed by Sinopec. A case study in the Laoling area, Shandong, China was primarily conducted by using geothermal software SMG, where the effect of well spacing and injection fluid temperature on the production was illustrated. Moreover, a geothermal recoverable resources evaluation method based on numerical simulation is proposed and used for the evaluation of regional geothermal dynamic recoverable resources in Laoling.
35
Falcone, G. « Proposal of a consistent framework to integrate geothermal potential classification with energy extraction ». Geothermal Energy Science 3, no 1 (12 mars 2015) : 7–11. http://dx.doi.org/10.5194/gtes-3-7-2015.
Texte intégralRésumé :
<p><strong>Abstract.</strong> The classification of geothermal resources is dependent on the estimate of their corresponding geothermal potential, so adopting a common assessment methodology would greatly benefit operators, investors, government regulators and consumers. <br><br> Several geothermal classification schemes have been proposed, but, to date, no universally recognised standard exists. This is due to the difficulty in standardising fundamentally different geothermal source and product types. The situation is not helped by the accepted use of inconsistent jargon among the geothermal community. In fact, the term "geothermal potential" is often interpreted differently by different geothermal practitioners. <br><br> This paper highlights the importance of integrating the classification of geothermal potential with that of geothermal energy extraction from well-defined development projects. A structured progression, from estimates of in situ quantities for a given prospect to actual production, is needed. Employing a unique, unambiguous framework would ensure that the same resource cannot exist simultaneously under different levels of maturity of the estimate (as in double bookings of resources), which would let stakeholders better assess the level of risk involved and the steps needed for a geothermal potential to achieve commercial extraction.</p>
36
Sun, Minglu, Xu Zhang, Xingcheng Yuan, Zhongyou Yu, Yao Xiao, Ying Wang et Yunhui Zhang. « Hydrochemical Characteristics and Genetic Mechanism of Geothermal Springs in the Aba Area, Western Sichuan Province, China ». Sustainability 14, no 19 (8 octobre 2022) : 12824. http://dx.doi.org/10.3390/su141912824.
Texte intégralRésumé :
Geothermal resources have been a source of significant clean energy in the world. The Sichuan Province is famous for its abundant geothermal resources in China, especially in western Sichuan. The Aba area is a significant minority region in northwestern Sichuan with abundant geothermal resources. In this study, hydrochemical and D-O analyses were conducted on the eight collected geothermal springs to investigate the genetic mechanism of the geothermal resource in the Aba area. The exposed temperatures and pH values of the geothermal springs ranged from 23 °C to 48 °C and from 6.6 to 9.5, respectively. Based on the hydrochemical characteristics, the eight geothermal springs were classified into two types: class A and class B. The class A geothermal springs belonged to the hydrochemical type of Ca-Mg-HCO3-SO4 and Ca-Mg-HCO3 and were affected by the weathering and dissolution of carbonate and silicate. The class B hydrochemical type of geothermal spring was Na-HCO3, which was determined by the weathering and dissolution of evaporite and silicate. A Na-K-Mg triangle diagram revealed that the geothermal springs belonged to immature water. A chalcedony geothermometer indicated that the temperature of the class A shallow geothermal reservoir in the Aba area was 59.70–73.00 °C and 70.65–120.91 °C for class B. Silicon enthalpy approaches showed that the initial reservoir temperature for class A was 181.36–203.07 °C (mixed by 85.76–89.44% cold water) and 271.74–295.58 °C (mixed by 87.39–87.54% cold water) for class B. The recharge elevation of the geothermal spring was 3415–3495 m as calculated by the D-O isotopes. We have proposed these genetic models of the two typical geothermal springs. The achievements provide a vital reference for the further development of geothermal water and the sustainable utilization of geothermal resources in the Aba area.
37
Gomes, Antonio Jorge de Lima, et Jorge Luiz dos Santos Gomes. « Deep-seated Geothermal Resources of the Parana Basin ». International Journal of Terrestrial Heat Flow and Applications 1, no 1 (30 avril 2018) : 52–58. http://dx.doi.org/10.31214/ijthfa.v1i1.24.
Texte intégralRésumé :
Updated data sets on terrestrial heat flow and thermal springs have been employed in outlining the nature of deep-seated geothermal resources of the Parana basin. A 1o x1o grid system was adopted for data processing and in determinations of vertical distributions of excess temperatures. The results obtained have led to an improved understanding of the occurrence of high temperature geothermal resources and allowed estimates of associated resource base. It has been possible to identify more than 20 crustal blocks where the resource base per unit area, referred to the accessible depth limit of 6 km, are in the range of 2x1011 to 9x1011 Joules. There are indications pointing to occurrence of medium temperature geothermal resources at depths of 4 to 6 km in several sectors of the central and western parts of the basin. The area extent of such blocks has dimensions of several tens of kilometers. Most high temperature resources occur within the well-known sectors of fault-controlled magmatic activity associated with the eruption of Serra Geral flood basalts. In addition, isolated pockets of high enthalpy geothermal resources are found to be present along the northwestern border. The results have also allowed better assessments of low temperature resources of the Guarani aquifer system, which span over large areas of southern Brazil, western Uruguay and northern Argentina.
38
Vieira, Fabio, et Valiya Hamza. « Assessment of Geothermal Resources of South America - A New Look ». International Journal of Terrestrial Heat Flow and Applications 2, no 1 (25 mars 2019) : 46–57. http://dx.doi.org/10.31214/ijthfa.v2i1.32.
Texte intégralRésumé :
The present work provides a new look into the nature and distribution of geothermal resources of South America, on the basis of recent advances in data analysis and regional assessments. Notable in this context is the progress achieved in the use of a procedure termed as magmatic heat budget (MHB) that allow estimation of heat flux in areas of recent volcanic activity. In addition, an updated compilation of temperature gradients and heat flux have been completed. Such advances have allowed new resource assessments for 6526 sites. These span over more than 100 crustal blocks, distributed in thirteen countries of the continent. Following this, a 2ox2ogrid system with homogenized data sets were employed for calculating the in-situ heat content. Determinations of resource base based on observational data are now available for 253 out of a total of 418 cells in this grid system. Values of resource base based on estimated heat flow were calculated for the remaining 165 grid elements. The data and model results on temperatures of subsurface strata at depths less than three kilometers have been employed in classifying the resources, into three general categories: hot dry rock (HDR), hot wet rock (HWR) and low enthalpy (LE). HDR type resources, classified as those with temperatures higher than 150oC, occur in 318 localities mainly in the Andean regions. Similarly, HWR type resources, classified as those with temperatures in the range of 90 to 150oC, occur in 352 localities. Low enthalpy (LE) resources, with temperatures < 90oC, are numerous mainly in the eastern parts of the continent. The total resource base (RB) of HDR systems is estimated to be 1329x1021J and the corresponding resource base per unit area (RBUA) is 513GJ/m2. The HWR systems have a total resource base of 586x1021J, while the corresponding value for RBUA is 409GJ/m2. The low enthalpy systems, with temperatures in the range of 60 to 90oC, have a total resource base of 240GJ/m2, while those with temperatures less than 60oCis estimated to be 210GJ/m2. There are indications that HDR resources, with temperatures higher than 150oC at depths less than three kilometers, occur in 318 localities of the Andean regions. The total resource base (RB) of HDR systems is estimated to be 1329x1021J, while the corresponding weighted mean resource base per unit area (RBUA) is estimated to be 513GJ/m2. The new results have also been useful in regional scale identification of resources with notable pore fluid circulation, classified as HWR systems. Such systems with temperatures in the range of 90 to 150oC, are inferred to occur at depths less than three kilometers, in 352 localities of the Andean region. The total resource base of HWR systems is estimated to be 586x1021J, while the corresponding value for RBUA is estimated to be 409GJ/m2. Low enthalpy (LE) resources, with temperatures in the range of < 90oC, are numerous in the remaining parts of Andean regions and also in the eastern parts of the continent. The resource base per unit area of low enthalpy systems with temperatures in the range of 60 to 90oC is estimated to be 240GJ/m2, while that for systems with temperatures less than 60oCis estimated to be 210GJ/m2.
39
Yu, Ouyang. « Current Situation, Challenges and Prospects of Geothermal Energy Development in China ». Highlights in Science, Engineering and Technology 25 (13 décembre 2022) : 165–74. http://dx.doi.org/10.54097/hset.v25i.3473.
Texte intégralRésumé :
Based on the geothermal resource conditions, the current situation of China's geothermal energy utilization in heating (cooling), power generation, hot spring bathing, high-end seed breeding, and hot dry rock exploration and development are explained. The development trend of geothermal energy in the fields of resource discovery, exploration, development and utilization technology, utilization scale, macro policies, and market participants are predicted in the context of the goal of "carbon peak and carbon neutral". Finally, suggestions on the management of China's geothermal industry is proposed.
40
Batchelor, Tony. « Geothermal energy : a major renewable energy resource ». Proceedings of the Institution of Civil Engineers - Civil Engineering 158, no 6 (novembre 2005) : 40–44. http://dx.doi.org/10.1680/cien.2005.158.6.40.
Texte intégral
41
Batchelor, Tony. « Geothermal energy : a major renewable energy resource ». Civil Engineering Innovation 1, no 2 (6 janvier 2007) : 69–74. http://dx.doi.org/10.1680/einn.2007.1.2.69.
Texte intégral
42
Batchelor, Tony. « Geothermal energy : a major renewable energy resource ». Civil Engineering Innovation 1, no 2 (juin 2007) : 69–74. http://dx.doi.org/10.1680/jciei.2007.14211.
Texte intégral
43
Kohl, T., S. Signorelli, I. Engelhardt, N. Andenmatten Berthoud, S. Sellami et L. Rybach. « Development of a regional geothermal resource atlas ». Journal of Geophysics and Engineering 2, no 4 (14 novembre 2005) : 372–85. http://dx.doi.org/10.1088/1742-2132/2/4/s11.
Texte intégral
44
Barcelona, Hernan, Martin Senger et Daniel Yagupsky. « Resource assessment of the Copahue geothermal field ». Geothermics 90 (février 2021) : 101987. http://dx.doi.org/10.1016/j.geothermics.2020.101987.
Texte intégral
45
Kohl, Thomas, Nathalie Andenmatten et Ladislaus Rybach. « Geothermal resource mapping—example from northern Switzerland ». Geothermics 32, no 4-6 (août 2003) : 721–32. http://dx.doi.org/10.1016/s0375-6505(03)00066-x.
Texte intégral
46
Grant, M. A. « Stored-heat assessments : a review in the light of field experience ». Geothermal Energy Science 2, no 1 (17 décembre 2014) : 49–54. http://dx.doi.org/10.5194/gtes-2-49-2014.
Texte intégralRésumé :
<p><strong>Abstract.</strong> Stored-heat or volumetric assessments of geothermal resources are appealingly simple: the resource being exploited is heat. A stored-heat calculation simply computes the amount of heat in the resource, similarly to computing the amount of ore in an ore body. The method has theoretical support in numerical simulations of resource production. While there are significant unknowns in any resource, some of these can be covered by probabilistic approaches, notably a Monte Carlo method. The Australian Geothermal Reporting Code represents one specification of such stored-heat assessments. <br><br> However the experience of recent decades, with the development of significant numbers of geothermal resources, has shown that the method is highly unreliable and usually biased high. The tendency to overestimates, in particular, has led to the reduced credibility of the method. An example is quoted where simple application of the apparently simple rules gives a ridiculous result. Much of the problem lies in the "recovery factor", the proportion of the resource that can actually be exploited, where comparison with actual performance shows past values have been in all cases too high, as is the current version of the Australian code. <br><br> There are further problems, usually overlooked, in the way that the reservoir volume and "cutoff temperature" are defined. Differing approaches mean that results between different reports are not comparable. The different approaches also imply unrecognised assumptions about the physical processes controlling reservoir depletion. The failure of Monte Carlo methods is similarly due to unrecognised violation of logical consistency in the use of probabilities. <br><br> The net effect of these problems is that the method is not a simple means to generate a rough resource estimate, and it often generates faulty results. Usually, such results are overestimates. Monte Carlo methods do not provide a protection against these errors. <br><br> The Australian Geothermal Reporting Code should be used for hydrothermal systems with an average recovery factor of 10%. With this average, results are subject to an error of ±70%. For enhanced geothermal systems (EGS), the recovery factor should be a few percent.</p>
47
Karlsdottir, Marta Ros, Jukka Heinonen, Halldor Palsson et Olafur Petur Palsson. « High-Temperature Geothermal Utilization in the Context of European Energy Policy—Implications and Limitations ». Energies 13, no 12 (19 juin 2020) : 3187. http://dx.doi.org/10.3390/en13123187.
Texte intégralRésumé :
The European Union (EU) has made climate change mitigation a high priority though a policy framework called “Clean Energy for all Europeans “. The concept of primary energy for energy resources plays a critical role in how different energy technologies appear in the context of this policy. This study shows how the calculation methodologies of primary energy content and primary energy factors pose a possible negative implication on the future development of geothermal energy when comparing against EU’s key energy policy targets for 2030. Following the current definitions of primary energy, geothermal utilization becomes the most inefficient resource in terms of primary energy use, thus contradicting key targets of increased energy efficiency in buildings and in the overall energy use of member states. We use a case study of Hellisheidi, an existing geothermal power plant in Iceland, to demonstrate how the standard primary energy factor for geothermal in EU energy policy is highly overestimated for efficient geothermal power plants. Moreover, we combine life cycle assessment and the commonly utilized combined heat and power production allocation methods to extract the non-renewable primary energy factor for geothermal and show how it is only a minimal fraction of the total primary energy factor for geothermal. The findings of the study apply to other geothermal plants within the coverage of the European Union’s energy policy, whether from high- or low-temperature geothermal resources. Geothermal has substantial potential to aid in achieving the key energy and climate targets. Still, with the current definition of the primary energy of geothermal resources, it may not reach the potential.
48
Priisholm, Søren, et Steen Christensen. « Assessment of geothermal resources and reserves in Denmark. A contribution to the geothermal ressource and reserve estimate of the European Community ». Danmarks Geologiske Undersøgelse Serie C 2 (31 janvier 1985) : 1–54. http://dx.doi.org/10.34194/seriec.v2.7096.
Texte intégralRésumé :
In 1979 the European Community (EC) Directorate-General for Research and Development invited the member states to look into the aspects of geothermal resource and reserve evaluation and practical implementation of the assessment exercise within the EC. From fall 1979 to fall 1981 a working group, in which Denmark was represented by E. Gosk, set-up guidelines for a description, classification, and evaluation of geothermal resources and reserves. The guidelines are basically those outlined by Muffler and Cataldi (1978), USGS Circ 790, and applied by Cataldi et al. (1978). Contractors working on geothermal energy within the EC were from 1982 involved in the assessment of geothermal resources and reserves. From Denmark the company Danish Oil and Natural Gas A/S (D.O.N.G. A/S) and the Geological Survey of Denmark (DGU) were invited to participate in the assessment. D.O.N.G. A/S was involved as the company had the concession on geothermal energy in Denmark and was making exploration drilling. DGU was involved as the survey up to that date had made the regional mapping of the reservoirs (Michelsen et al. 1981) and was involved in contract work for the EC. The contract (no. EG-B-3-005-DK(G)) between EC and DGU, 1981-1982, had the goal of investigating the reservoir properties of possible geothermal reservoir rocks. The study was terminated with the report "Geothermal Reservoirs in Denmark" (Priisholm et al. 1982). The above mentioned contract was by a First Supplementary Agreement extended to cover 1983 with the aim of making an assessment of the geothermal resources and reserves in Denmark. The work is terminated with this final report. The report is based on the general geological knowledge of the reservoir properties which are available at the survey from the previous studies and on data made available through the exploration activities of D.O.N.G. A/S. The evaluation of assessments has been carried out as a joint work where D.G.U. has contributed with the geology and reservoir data while Tage Sørensen A/S made the resource and reserve assessments.
49
Chen, Hong, Xingbing Xie, Enqin Liu, Lei Zhou et Liangjun Yan. « Application of Infrared Remote Sensing and Magnetotelluric Technology in Geothermal Resource Exploration : A Case Study of the Wuerhe Area, Xinjiang ». Remote Sensing 13, no 24 (8 décembre 2021) : 4989. http://dx.doi.org/10.3390/rs13244989.
Texte intégralRésumé :
As a new green energy source, geothermal resource’s exploration, development, and utilization are an important direction in geophysical exploration at present. In this study, the actual land surface temperature was inferred based on the thermal infrared band of Landsat8 remote-sensing images, and the information about the surface anomalies and their spatial distribution was obtained through a multifactor analysis. In addition, three magnetotelluric sounding profiles were deployed in the study area, and the geo-electric sections in the study area were obtained through inversion of the measured data. Then, based on the inverse geo-electric information and the land surface temperature anomaly information, we analyzed and verified the geothermal resource genesis of the thermal anomaly area and inferred the favorable geothermal resource area in the study area. The results show that these two methods can be used to compare and analyze the possible distribution of the geothermal resources in the study area in two dimensions: the spatial distribution on the surface and the vertical distribution in the subsurface. Moreover, the results of the geothermal anomalies inferred from the thermal infrared remote sensing and the geo-electric results inferred from the magnetotelluric data are in good agreement. This study demonstrates that the integrated application of thermal infrared remote sensing and magnetotelluric technology is a promising tool for geothermal exploration.
50
Axelsson, G. « Sustainable geothermal energy utilization ». International Review of Applied Sciences and Engineering 1, no 1-2 (1 décembre 2010) : 21–30. http://dx.doi.org/10.1556/irase.1.2010.1-2.4.
Texte intégralRésumé :
Abstract Sustainable development involves meeting the needs of the present without compromising the ability of future generations to meet their needs. The Earth's enormous geothermal resources have the potential to contribute significantly to sustainable energy use worldwide and to help mitigate climate change. Experience from the use of geothermal systems worldwide, lasting several decades, demonstrates that by maintaining production below a certain limit the systems reach a balance between net energy discharge and recharge that may be maintained for a long time. Therefore, a sustainability time-scale of 100 to 300 years has been proposed. Studies furthermore indicate that the effect of heavy utilization is often reversible on a time-scale comparable to the period of utilization. Geothermal resources can be used in a sustainable manner either through (1) constant production below a sustainable limit, (2) step-wise increase in production or (3) intermittent excessive production with breaks during which other geothermal resources need to fill in the gap. The long production histories that are available for geothermal systems provide the most valuable data available for studying sustainable management of geothermal resources, and reservoir modelling is the most powerful tool available for this purpose. The paper reviews long utilization experiences from e.g. Iceland, France and Hungary and presents sustainability modelling studies for the Hamar geothermal system in Iceland and the Beijing Urban system in China. International collaboration has facilitated sustainability research and fruitful discussions as well as identifying several relevant research issues. Distinction needs to be made between sustainable production from a particular geothermal resource and the more general sustainable geothermal utilization, which involves integrated economical, social and environmental development. Developing a sustainability policy involves setting general sustainability goals and consequently defining specific sustainability indicators to measure the degree of sustainability of a given geothermal operation or progress towards sustainability.