Journal articles: 'Geothermal geology'

1

TOMASZEWSKA, Barbara, Marta DENDYS, and Leszek PAJĄK. "ANALYSIS OF HYDROGEOLOGICAL CONDITIONS SUPPORTED BY A MATHEMATICAL MODELING AS THE BASIC STAGE OF INVESTMENT PROJECTS IN GEOTHERMY FIELD." Biuletyn Państwowego Instytutu Geologicznego 471 (October 1, 2018): 179–84. http://dx.doi.org/10.5604/01.3001.0012.4931.

Full text

Abstract:

Geothermal groundwaters are deposits that must be categorised as a mining property. Their exploitation is possible with a mining concession and permission of use. Geothermal groundwaters in Poland are used in heating, balneotherapy and recreation purposes. Over the last years, investigations have been carried out to intensify the use of geothermal groundwaters. They can be used as new geothermal products, for example as a mineralised concentrate. Investment projects related to geothermal groundwaters should be prepared with care about safe and sustained exploitation in long-term perspective. Using of geothermal groundwaters is determined by technical and economical conditions. However, successful exploitation depends also on natural conditions e.g. water temperature, physical features, chemical composition and durability of parameters, and renewability of resources. Recognition of these elements give a basic information that nowadays can be integrated as mathematical models. The models are created to analyse and simulate the conditions of geothermal systems. It often happens before starting project operating activities. The paper presents examples of projects carried out over the recent years. They have been associated with the using and management of geothermal groundwaters and the key role has been played by mathematical modelling in the field of geothermy and hydrogeology.

APA, Harvard, Vancouver, ISO, and other styles

2

Mazzoli, Stefano. "Geothermal Energy and Structural Geology." Energies 15, no. 21 (October 31, 2022): 8074. http://dx.doi.org/10.3390/en15218074.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Dai, Peng, Kongyou Wu, Gang Wang, Shengdong Wang, Yuntao Song, Zhenhai Zhang, Yuehan Shang, Sicong Zheng, Yinsheng Meng, and Yimin She. "Geothermal Geological Characteristics and Genetic Model of the Shunping Area along Eastern Taihang Mountain." Minerals 12, no. 8 (July 22, 2022): 919. http://dx.doi.org/10.3390/min12080919.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

4

Zhang, Xiao Ling, Hong Zhan Liu, and Kang Chen. "Geothermal Geology Characteristic and Origin Analysis of Shilin Basin in Yunnan Province." Advanced Materials Research 779-780 (September 2013): 1449–52. http://dx.doi.org/10.4028/www.scientific.net/amr.779-780.1449.

Full text

Abstract:

based on geothermal anomalies and geothermal wells of Shilin basin, the structure of geothermal reservoirs, geothermal geological characteristics and hydrochemistry of thermal groundwater are examined. Geothermal reservoir of the geothermal field is Proterozoic Sinian dolomite and dolomitic limestone. Characteristic of geothermal water runoff and geothermal field are controlled by Jiuxiang fracture and Niutoushan ancient mainland. The drillings data shows that the temperature gradient is 1.5-4.8°C/100m. Deep circulation is the main origin of geothermal water. The chemical type of geothermal water is HCO3-Ca, and high silicic acid content. The geothermal water supply is limited from the hydrogeological conditions; we should control the development and utilization.

APA, Harvard, Vancouver, ISO, and other styles

5

Shang, Yun Hu, Li Qing Liang, Peng Yuan Xu, An Da Zhang, and Yang Shen. "Prospecting and Evaluation of Geothermal Resources in Julang Pasture Area, Lindian County." Applied Mechanics and Materials 501-504 (January 2014): 451–54. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.451.

Full text

Abstract:

Based on collecting the regional survey data and prospecting the study region of geothermal geology and geothermal fluid characteristics, evaluate the geothermal energy reserves and the recoverable reserves of geothermal water uses geothermal reserve method and analytical method in Julang Pasture, and evaluates the geothermal fluid quality comprehensively. The above evaluation provides a preliminary basis for sustainable development, utilization and protection of geothermal resources in that region.

APA, Harvard, Vancouver, ISO, and other styles

6

Ogoso-Odongo, Meshack E. "Geology of the Olkaria geothermal field." Geothermics 15, no. 5-6 (January 1986): 741–48. http://dx.doi.org/10.1016/0375-6505(86)90087-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Wood, C. P. "Geology of the rotorua geothermal system." Geothermics 21, no. 1-2 (February 1992): 25–41. http://dx.doi.org/10.1016/0375-6505(92)90066-i.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

SONG, Guofeng, Xianzhi SONG, Gensheng LI, Ruina XU, Wenjiong CAO, and Chenru Zhao. "Multi‐objective Optimization of Geothermal Extraction from the Enhanced Geothermal System in Qiabuqia Geothermal Field, Gonghe Basin." Acta Geologica Sinica - English Edition 95, no. 6 (December 2021): 1844–56. http://dx.doi.org/10.1111/1755-6724.14875.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Yan, Hua, Zhi Yuan Ma, Ting Li, and Guang Liang Niu. "Environmental Isotope Hydrogeochemical Characteristics and Instructions of Geothermal Water in Xianyang Urban Area." Advanced Materials Research 518-523 (May 2012): 4161–64. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.4161.

Full text

Abstract:

In order to find out the origin of geothermal water in Xianyang urban area and provide scientific basis for sustainable use, taking the geothermal water as study object, we systematically studied supply circulation mechanism of geothermal water in Xianyang urban area through environmental isotope hydrogeochemical methods, and come to the conclusion: geothermal water in Xianyang urban area is bounded by shore fracture of Wei River, which shows totally different hydrogeochemical features. The differences suggests that the geothermal water belongs to different tectonic geology units and sedimentary environment. The distribution characteristics of environmental isotope such as δD、δ18O and 14C confirmed that geothermal water exists contact between the study area and northwest of Wei River. The supply water source of geothermal water comes from the atmospheric precipitation of Holocene in northwest direction, its updating ability is poor except partial deep fault slightly being recharged from modern atmospheric water.

APA, Harvard, Vancouver, ISO, and other styles

10

Cheng, Arthur. "President's Page: Geothermal energy: Current and future." Leading Edge 41, no. 9 (September 2022): 588–89. http://dx.doi.org/10.1190/tle41090588.1.

Full text

Abstract:

Geothermal energy is a key component and crucial part of the transition from fossil fuel to renewable energy. There are many places on earth where one can produce significant amounts of electricity from geothermal reservoirs. In addition to electricity generation, geothermal energy is used extensively for space heating. The identification, construction, and operation of a geothermal energy system requires the combined expertise of geologists, engineers, and geophysicists. As we strive for carbon-neutral energy solutions, geothermal energy will play an increasingly important part in our future.

APA, Harvard, Vancouver, ISO, and other styles

11

Kaven, J. O., D. C. Templeton, and Arpita P. Bathija. "Introduction to this special section: Geothermal energy." Leading Edge 39, no. 12 (December 2020): 855–56. http://dx.doi.org/10.1190/tle39120855.1.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

12

Bergerat, Françoise, Kristjan Sæmundsson, Loïc Fourel, and Jacques Angelier. "Structure and activity of the geothermal field of Hvalfjörður (Iceland) from brittle tectonic, geothermal and paleostress analysis." Bulletin de la Société Géologique de France 184, no. 4-5 (July 1, 2013): 451–65. http://dx.doi.org/10.2113/gssgfbull.184.4-5.451.

Full text

Abstract:

Abstract This paper presents the results of brittle tectonic, palaeostress inversion, and hydrothermal mineralisation studies of the Hvalfjörður low-temperature geothermal field in Southwest Iceland. This geothermal field (including two pronounced thermal anomalies) is located in the highly altered core area of an extinct and deeply eroded Tertiary central volcano. Most of the geothermal water appears to be conducted by vertical extension fractures. Palaeostress analysis indicates a rather complex stress history, with four major trends of extension involving normal and strike-slip faulting modes as well as dyke injection. Analysis of the data on the relative chronology indicates that these four regimes were closely intricate in time and space. The most important regime is a NW-SE, rift-perpendicular extension related to the oceanic rifting in Iceland. This trend partly controls the past (Pliocene-Early Pleistocene) hydrothermal activity in the Hvalfjörður area; however, an E-W rift-oblique extension also occurred with a N-S trending fracture system including normal faults, dykes and veins that show higher levels of hydrothermal mineralisation. Currently, there is strong hot-water convection, producing a thermal anomaly, in this N-S-trending fracture system. Our study highlights the paleostress evolution and the development of fracture systems in Hvalfjörður, including the past geothermal history; nevertheless the most efficient tool in geothermal prospection in such complex area remains the shallow geothermal survey. It has proved successful in many localities in Early Pleistocene to Miocene rocks where no surface indication of geothermal activity exists.

APA, Harvard, Vancouver, ISO, and other styles

13

ZHAO, Jiayi, Guiling WANG, Cuiyun ZHANG, Linxiao XING, Man LI, and Wei ZHANG. "Genesis of Geothermal Fluid in Typical Geothermal Fields in Western Sichuan, China." Acta Geologica Sinica - English Edition 95, no. 3 (June 2021): 873–82. http://dx.doi.org/10.1111/1755-6724.14715.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Julzarika, Atriyon, and Udhi Catur Nugroho. "PRELIMINARY DETECTION OF GEOTHERMAL MANIFESTATION POTENTIAL USING MICROWAVE SATELLITE REMOTE SENSING." International Journal of Remote Sensing and Earth Sciences (IJReSES) 15, no. 2 (February 25, 2019): 187. http://dx.doi.org/10.30536/j.ijreses.2018.v15.a2772.

Full text

Abstract:

The satellite technology has developed significantly. The sensors of remote sensing satellites are in the form of optical, Microwave, and LIDAR. These sensors can be used for energy and mineral resources applications. The example of those applications are height model and the potential of geothermal manifestation detection. This study aims to detect the potential of geothermal manifestation using remote sensing. The study area is the Northern of the Inverse Arc of Sulawesi. The method used is remote sensing approach for its preliminary detection with 4 steps as follow (a) mining land identification, (b) geological parameter extraction, (c) preparation of standardized spatial data, and (d) geothermal manifestation. Mining lands identification is using Vegetation Index Differencing method. Geological parameters include structural geology, height model, and gravity model. The integration method is used for height model. The height model integration use ALOS PALSAR data, Icesat/GLAS, SRTM, and X SAR. Structural geology use dip and strike method. Gravity model use physical geodesy approach. Preparation of standardized spatial data with re-classed and analyzed using Geographic Information System between each geological parameter, whereas physical geodesy methods are used for geothermal manifestation detection. Geothermal manifestation using physical geodesy approach in Barthelmes method. Grace and GOCE data are used for gravity model. The geothermal manifestation detected from any parameter is analyzed by using geographic information system method. The result of this study is 10 area of geothermal manifestation potential. The accuracy test of this research is 87.5 % in 1.96 σ. This research can be done efficiently and cost-effectively in the process. The results can be used for various geological and mining applications.

APA, Harvard, Vancouver, ISO, and other styles

15

Civilini, Francesco, Aasha Pancha, Martha Kane Savage, Steven Sewell, and John Townend. "Inferring shear-velocity structure of the upper 200 m using cultural ambient noise at the Ngatamariki geothermal field, Central North Island, New Zealand." Interpretation 4, no. 3 (August 1, 2016): SJ87—SJ101. http://dx.doi.org/10.1190/int-2015-0204.1.

Full text

Abstract:

We have determined subsurface structure using the refraction microtremor (ReMi) method at the Ngatamariki geothermal field, Central North Island, New Zealand. The local geology is such that refraction and reflection studies are hindered by energy scattering and attenuation in the near-surface layers. The ReMi method uses surface waves from ambient noise and active sources to determine S-wave velocities in the shallow subsurface. We have deployed two lines of 72-channel, 10 Hz vertical geophones with 10 m spacing, and we were able to model near-surface S-wave velocity to depths of 57–93 m for 2D profiles and as much as 165 m for 1D profiles. Shear-velocity anomalies were detected on one line that were spatially correlated with a fault. The location of the fault was previously inferred from stratigraphic offset in the geothermal wells, suggesting that the ReMi method can provide important constraints on near-surface geology in noisy geothermal settings.

APA, Harvard, Vancouver, ISO, and other styles

16

Vasco, Donald W., Jonny Rutqvist, Pierre Jeanne, Sergey V. Samsonov, and Craig Hartline. "Using geodetic data in geothermal areas." Leading Edge 39, no. 12 (December 2020): 883–92. http://dx.doi.org/10.1190/tle39120883.1.

Full text

Abstract:

Geodetic observations, often in conjunction with other data, provide a cost-effective means for identifying and characterizing geothermal resources. A review of the various methods reveals how the technology for measuring deformation has advanced considerably in the past few decades. Currently, interferometric synthetic aperture radar is the method of choice for monitoring deformation at a geothermal field. A discussion of geodetic monitoring at The Geysers geothermal field, California, illustrates some of the progress made and the challenges that remain.

APA, Harvard, Vancouver, ISO, and other styles

17

Martínez-Garzón, Patricia, Grzegorz Kwiatek, Stephan Bentz, Marco Bohnhoff, and Georg Dresen. "Induced earthquake potential in geothermal reservoirs: Insights from The Geysers, California." Leading Edge 39, no. 12 (December 2020): 873–82. http://dx.doi.org/10.1190/tle39120873.1.

Full text

Abstract:

Geothermal reservoir production and associated induced seismicity may experience pronounced attention in the near future, given the ambitious plans for reducing greenhouse gas emissions toward a carbon-neutral economy and society. At some geothermal sites, the occurrence of hazard- and risk-prone induced earthquakes caused by or associated with reservoir stimulation has resulted in project shutdown (e.g., Pohang, South Korea, and Basel Deep Heat Mining, Switzerland). At other geothermal sites, the maximum event magnitudes were successfully maintained below a threshold defined by local authorities (e.g., Helsinki St1 Deep Heat project in Helsinki, Finland). In this study, we review some of our results from seismological and geomechanical reservoir characterization at The Geysers geothermal reservoir in California, USA, the largest producing geothermal field worldwide. We relate our findings to other geothermal sites to better understand the variability of reservoir behavior. In particular, we obtain a constant and relatively low seismic injection efficiency at The Geysers, which is interpreted to be related to the large energy dissipation through thermal processes and additional dissipation through aseismic slip, the latter now being considered to play a fundamental role in earthquake nucleation. We discuss some characteristics of the seismicity from The Geysers that suggest stable reservoir seismic injection efficiency and possibly low potential to rupture into large induced earthquakes, reducing the associated seismic hazard.

APA, Harvard, Vancouver, ISO, and other styles

18

Primaleon, Loraine Pastoriza, Kenneth J. W. McCaffrey, and Robert E. Holdsworth. "Fracture attribute and topology characteristics of a geothermal reservoir: Southern Negros, Philippines." Journal of the Geological Society 177, no. 5 (May 5, 2020): 1092–106. http://dx.doi.org/10.1144/jgs2019-126.

Full text

Abstract:

The characterization of fracture networks using attribute and topological analyses has not been widely applied to the understanding and prediction of the secondary porosity, permeability and fluid flow characteristics of geothermal resources. We acquired fracture length, aperture, intensity and topological data from remotely sensed images and surface exposures of the Cuernos de Negros region and compared these data with well cores and thin sections from the underlying active geothermal reservoir: the Southern Negros Geothermal Field, west central Philippines. We show that the fracture attributes of the analogue and reservoir are best described by a power law distribution of fracture length and aperture intensity across six to eight orders of magnitude. This characterization of outcrop and borehole fractures validates the use of surface exposures as analogues for the Southern Negros Geothermal Field reservoir rocks at depth. An observed change in the scaling exponent in the 100–500 m length scale suggests that regional to sub-regional fracture systems scale differently from those at the meso- and macroscale, which may be a strata-bound effect or a sampling issue. Topological analyses show a dominance of Y-nodes and doubly connected branches, that indicates a high degree of fracture connectivity, which is important for effective fluid flow.Supplementary Material: Slopes, coefficient of determination and Aikake information criterion values of the cumulative frequency v. length and aperture plots of all fracture transects are available at https://doi.org/10.6084/m9.figshare.c.4960559Thematic collection: This article is part of the The Geology of Fractured Reservoirs collection available at: https://www.lyellcollection.org/cc/the-geology-of-fractured-reservoirs

APA, Harvard, Vancouver, ISO, and other styles

19

Voulgaris, N., I. Parcharidis, M. Pahoula, and E. Pirlis. "CORRELATION OF TECTONICS, SEISMICITY AND GEOTHERMICS OF LESBOS ISLAND USING REMOTE SENSING DATA AND GEOGRAPHICAL INFORMATION SYSTEMS." Bulletin of the Geological Society of Greece 36, no. 2 (July 23, 2018): 938. http://dx.doi.org/10.12681/bgsg.16895.

Full text

Abstract:

The development of a specialized Geographical Information System aiming at the better understanding of the relation between tectonics, seismicity and geothermal potential of Lesbos Island is discussed in the present paper. The development of this system was based on the processing and analysis of satellite images in order to identify both tectonic and thermal anomalies for further correlation with available vector and raster data. For this purpose a database including topology, geology, tectonics, seismicity and geothermy, was created. This data set derived from digitizing the topographic and geological maps of HAGS and IGME, from the analysis of the satellite image and from bibliography. As a result of the data processing there were indications about new evidence concerning the tectonics and the geothermy of Lesbos Island.

APA, Harvard, Vancouver, ISO, and other styles

20

Salaun, Nicolas, Helene Toubiana, Jean-Baptiste Mitschler, Guillaume Gigou, Xavier Carriere, Vincent Maurer, and Alexandre Richard. "High-resolution 3D seismic imaging and refined velocity model building improve the image of a deep geothermal reservoir in the Upper Rhine Graben." Leading Edge 39, no. 12 (December 2020): 857–63. http://dx.doi.org/10.1190/tle39120857.1.

Full text

Abstract:

Over the past 35 years, geothermal projects have been developed in the Upper Rhine Graben (URG) to exploit deep geothermal energy. Underneath approximately 2 km of sedimentary deposits, the deep target consists of a granitic basement, which is highly fractured and hydrothermally altered. Therefore, it has high potential as a geothermal reservoir. Despite dense 2D seismic data coverage originally acquired for oil exploration (for a target two-way traveltime between 300 and 700 ms), the faults at the top of the granitic basement (between 1400 and 4000 ms) are poorly imaged, and their locations remain uncertain. To gain a better understanding of this large-scale faulting and to ensure the viability of future geothermal projects, a 3D seismic survey was acquired in the French part of the URG during the summer of 2018. This paper describes how an integrated project, combining seismic data processing, high-end imaging, and enhanced interpretation, was conducted to improve the understanding of this complex basin for geothermal purposes. By revealing the deep granite layer and its complex associated fault network, the insight from this project can help accurately locate future production wells.

APA, Harvard, Vancouver, ISO, and other styles

21

Jones, M. Q. W. "Anomalous geothermal gradients and heat flow in the Limpopo Province, South Africa: Implications for geothermal energy exploration." South African Journal of Geology 120, no. 2 (June 1, 2017): 231–40. http://dx.doi.org/10.25131/gssajg.120.2.231.

Full text

Abstract:

Abstract The crustal rocks of South Africa are generally regarded as too old and cold for utilisation of geothermal energy. However, demands for alternative energy and the introduction of new technology have instigated a number of research projects in this and surrounding countries. Higher than average heat flow and the occurrence of several thermal springs in the northern Limpopo Province suggest that this region is a potential target area. Geothermal measurements in the eastern part of the Province yield anomalously high rock temperatures, thermal gradients (up to 90 K/km) and heat flow (up to 200 mW m-2). The anomalies are attributed to deep-seated circulation of meteoric water that provides an effective mechanism for concentrating geothermal heat. Heat flow studies of this kind may reveal more extensive potential geothermal fields elsewhere in South Africa.

APA, Harvard, Vancouver, ISO, and other styles

22

Rigault, Cécile, Patricia Patrier, and Daniel Beaufort. "Clay minerals related to circulation of near neutral to weakly acidic fluids in active high energy geothermal systems." Bulletin de la Société Géologique de France 181, no. 4 (July 1, 2010): 337–47. http://dx.doi.org/10.2113/gssgfbull.181.4.337.

Full text

Abstract:

Abstract Clay minerals are widespread alteration products in most hydrothermal systems and are considered as efficient petrogenetic guides. Their distribution in active geothermal fields depends on the ability of the fluid to approach equilibrium with host rocks at any scale during the hydrothermal processes. Both illitization and chloritization reactions depend on factors such as time, water-rock ratio, deformation history... as well as the variables used to define equilibrium (i.e., temperature, composition). This paper is focussed on how the properties of clay minerals change with respect to the evolution of hydrogeological conditions during the life time of geothermal systems. The presented data are based on comparative studies performed in productive and non productive zones of several active geothermal systems related to subduction plate tectonics (Chipilapa, Milos and Bouillante). The temporal sequence of clay crystallizations can be summarized as follows. The opening stage of the geothermal system promotes a massive crystallization of metastable smectites in conditions of strong thermodynamic disequilibrium. As time and alteration progress, clay minerals of the newly sealed parts of the reservoir are transformed in more stable phases (via dissolution crystallization processes). Metastable smectites continue to precipitate in the permeable zones still subjected to strong physico-chemical disequilibrium such as boiling or mixing of fluids of contrasted composition and/or temperature, whereas clay minerals close to those predicted by thermodynamic calculations (illite, chlorite) crystallize in other zones in which the geothermal fluid can reach chemical equilibrium with the altered host rock. Downward infiltration of surficial water led to crystallization of montmorillonite in the outer part of geothermal fields. Collapsing of hydrothermal activity leads to a change in the heat flow regime with predominance of a depth dependant conductive thermal gradient. Even if such thermal conditions promote the transformation of the previously formed smectite rich metastable clay minerals and lead to a progressive emplacement of depth dependant conversion series of di- and trioctahedral smectites to respectively illite and chlorite, signatures of the ancient geothermal reservoirs are preserved in the textural or microstructural properties of the clay particles which sealed them.

APA, Harvard, Vancouver, ISO, and other styles

23

Johnston, Ian. "Geothermal energy: shallow sources." Proceedings of the Royal Society of Victoria 126, no. 2 (2014): 25. http://dx.doi.org/10.1071/rs14025.

Full text

Abstract:

Below a depth of around 5 to 8 metres below the surface, the ground displays a temperature which is effectively constant and a degree or two above the weighted mean annual air temperature at that particular location. In Melbourne, the ground temperature at this depth is around 18°C with temperatures at shallower depths varying according the season. Further north, these constant temperatures increase a little; while for more southern latitudes, the temperatures are a few degrees cooler. Shallow source geothermal energy (also referred to as direct geothermal energy, ground energy using ground source heat pumps and geoexchange) uses the ground and its temperatures to depths of a few tens of metres as a heat source in winter and a heat sink in summer for heating and cooling buildings. Fluid (usually water) is circulated through a ground heat exchanger (or GHE, which comprises pipes built into building foundations, or in specifically drilled boreholes or trenches), and back to the surface. In heating mode, heat contained in the circulating fluid is extracted by a ground source heat pump (GSHP) and used to heat the building. The cooled fluid is reinjected into the ground loops to heat up again to complete the cycle. In cooling mode, the system is reversed with heat taken out of the building transferred to the fluid which is injected underground to dump the extra heat to the ground. The cooled fluid then returns to the heat pump to receive more heat from the building.

APA, Harvard, Vancouver, ISO, and other styles

24

Zui, Vladimir I., and Siamak Mansouri Far Far. "Geothermal field and geology of the Caspian Sea region." Journal of the Belarusian State University. Geography and Geology, no. 1 (June 20, 2019): 104–18. http://dx.doi.org/10.33581/2521-6740-2019-1-104-118.

Full text

Abstract:

The Caspian Sea and adjacent areas form the vast oil and gas-bearing megabasin. It consists of North Caspian, Middle Caspian, and South Caspian sedimentary basins. The granite-metamorphic basement of the basins becomes from north to south younger in the direction from Early Precambrian to Early Cimmerian age. It represents a transitional zone from the southern edge of the East European Craton to Alpine folding. Geothermal investigations have been carried out both in hundreds of deep boreholes and within the Caspian Sea and a few preliminary heat flow maps were published for the Caspian Sea region. All they excluded from consideration the southern part of the region within Iranian national borders. We prepared a new heat flow map including the northern Iran. The purpose of the article is to consider heat flow pattern within the whole Caspian Sea region including its southern part. Two vast high heat flow anomalies above 100 mW/m2 distinguished in the map: within the southwestern Iran and in waters of the Caspian Sea to the North of the Apsheron Ridge, separated by elongated strip of heat flow below 50 –55 mW/m 2 . A general tendency of heat flow from growing was distinguished from the Precambrian crustal blocks of the North Caspian Depression to the Alpine folding within the territory of Iran. Analysis of the heat flow pattern is discussed and two heat flow density profiles were compiled.

APA, Harvard, Vancouver, ISO, and other styles

25

Xiao, Jun, Bei Zhu, and Ji Hua Liao. "Effects of High Temperature and Overpressure on Deep Reservoir in Qiongdongnan Basin, Northwestern South China Sea." Advanced Materials Research 356-360 (October 2011): 3033–37. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.3033.

Full text

Abstract:

Abnormal temperature and pressure with their effects on deep reservoir is the frontier in petroleum geology. Taking Qiongdongnan basin as a case study, the geological settings of this basin are primarily analyzed in this paper. Then, based on the full consideration of sedimentation and diagenesis, effects of abnormal temperature and pressure on deep reservoir are discussed. Main conclusions are drawn as following: (1) high geothermal or geothermal gradient accelerates the reduction of sandstone porosity, (2) high geothermal or geothermal gradient can improve the reservoir properties by promoting the dissolution of carbonate minerals, the filling of hydrocarbon and the development of overpressure, (3) overpressure can preserve partial primary pores, (4) overpressure can inhibit the growth of some cements and slow down the destruction of diagenesis on deep reservoir, and (5) overpressure can generate some secondary pores by enhancing dissolution.

APA, Harvard, Vancouver, ISO, and other styles

26

BURGESS, WILLIAM G. "Geothermal energy." Geology Today 5, no. 3 (May 1989): 88–92. http://dx.doi.org/10.1111/j.1365-2451.1989.tb00630.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Horn, Daniel, Matthias Gross, Maria Pfeiffer, and Marco Sonnberger. "How Far Is Far Enough? The Social Constitution of Geothermal Energy through Spacing Regulations." Sustainability 14, no. 1 (January 4, 2022): 496. http://dx.doi.org/10.3390/su14010496.

Full text

Abstract:

This article argues that the sociotechnical context in which near-surface geothermal energy is embedded draws out its characteristic of being temporarily depletable. Thereby, the minimization of unavoidable side effects, such as cold plumes, which result from the social constitution of geothermal energy, is a crucial area of consideration. Using the situation in Germany as a touchstone, we discuss how cold plumes and interferences from neighboring ground source heat pumps test the limits of the existing regulatory framework, requiring negotiations between different knowledge sets stemming from areas as diverse as planning law, geology, cultural habits, and engineering. This makes the operation of geothermal energy highly uncertain and continuous negotiations on sustainable modes of extractions a pressing issue.

APA, Harvard, Vancouver, ISO, and other styles

28

Tiwari, Sameer K., Kalachand Sain, and Jairam Singh Yadav. "Assessment of Geothermal Renewable Energy with Reference to Tapoban Geothermal Fields, Garhwal Northwest Himalaya, India." Journal of the Geological Society of India 98, no. 6 (June 2022): 765–70. http://dx.doi.org/10.1007/s12594-022-2066-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Prana, Antoni Wira. "Policy Directions of Geothermal Potential at Sembalun District of East Lombok Regency in Nusa Tenggara Barat Province, Indonesia." Sumatra Journal of Disaster, Geography and Geography Education 2, no. 1 (June 5, 2018): 71. http://dx.doi.org/10.24036/sjdgge.v2i1.127.

Full text

Abstract:

This research attempted to study physical characteristics of geothermal and formulate policy directions of geothermal potential through the process of ISM (Interpretative Structural Modelling) analysis in Sembalun District of East Lombok Regency. This descriptive qualitative research design used observation, interview, and documentation for collecting the data. Two types of data were collected, namely primary and secondary data. The result of ISM analysis on the data found that the geology of Sembalun area is the remains of an old volcano which has gone through destruction process with today’s remains’ characteristics of rough, rocky and steep ground surface and 550-2250 masl height. The geomorphology of Sembalun is classified into three units, namely morphology of steep volcano, morphology of sloping volcanic hills, and morphology of denudational plains. Sloping volcanic hills stretch from the northwestern to the southwestern areas and some in the southeastern area as a part of protected forest and national park of Mount Rinjani. The slope is between 30-70 degrees and arranged by volcanic rocks. Policy directions of geothermal potential are 1) as geothermal power plants for power sources, 2) geothermal energy for crop drying, 3) geothermal energy for sterilization of planting media in the future, and 4) geothermal energy for tourism sector.

APA, Harvard, Vancouver, ISO, and other styles

30

Kramers, L., J. D. van Wees, M. P. D. Pluymaekers, A. Kronimus, and T. Boxem. "Direct heat resource assessment and subsurface information systems for geothermal aquifers; the Dutch perspective." Netherlands Journal of Geosciences - Geologie en Mijnbouw 91, no. 4 (December 2012): 637–49. http://dx.doi.org/10.1017/s0016774600000421.

Full text

Abstract:

AbstractA resource assessment methodology has been developed to designate prospective high permeable clastic aquifers and to assess the amount of potential geothermal energy in the Netherlands. It builds from the wealth of deep subsurface data from oil and gas exploration and production which is publicly and digitally available. In the resource assessment various performance indicator maps have been produced for direct heat applications (greenhouse and spatial heating). These maps are based on detailed mapping of depth, thickness, porosity, permeability, temperature and transmissivity (methodology presented in other papers in this NJG issue). In the resource assessment analysis 14 lithostratigraphic units (clastic aquifers) have been considered, ranging in age from the Permian to the Cenozoic. Performance maps have been made which include a) the expected doublet power (MWth) to be retrieved; b) the number of houses or hectares that can be heated from one doublet; and c) a potential indicator map, which provides insight in subsurface suitability for specific applications from a techno-economic perspective. To obtain a nationwide overview of the resource potential in terms of recoverable geothermal energy, a progressive filtering approach was used from total heat content of the reservoirs (Heat In Place – HIP) via the heat that can potentially be recovered (Potential Recovery Heat – PRH) to energy maps taking into account a techno-economic performance evaluation (Recoverable Heat – RH). Results show that the HIP is approximately 820,000 PJ which is significantly more than previous estimates of around 90,000 PJ. This considerable increase in geothermal energy potential is the result of accurate geological mapping of key reservoir properties and the development of state-of-the-art techno-economic performance assessment tools that performs Monte Carlo simulation. Moreover, for the previous estimates boundary conditions were set with the aim to compare the geothermal potential between different EU countries (Rijkers & Van Doorn, 1997). Taking into account techno-economic aspects, the RH is in the order of 85,000 PJ. This is equivalent to ~70% of the ultimate recoverable gas of the Slochteren Gas field. In total over 400 maps have been created or used as input for the resource assessment. Together, they provide comprehensive information for geothermal energy development from various stakeholder perspectives. The maps can be interactively assessed in the web-based portal ThermoGIS (www.thermogis.nl). This application complements existing subsurface information systems available in the Netherlands and supports the geothermal community in assessing the feasibility of a geothermal system on a regional scale.

APA, Harvard, Vancouver, ISO, and other styles

31

Trainor-Guitton, Whitney. "The value of geophysical data for geothermal exploration: Examples from empirical, field, and synthetic data." Leading Edge 39, no. 12 (December 2020): 864–72. http://dx.doi.org/10.1190/tle39120864.1.

Full text

Abstract:

The value of information (VOI) metric requires geophysicists to clearly link their measurements to important subsurface parameters in geothermal exploration, such as temperature, permeability, and fluid information. The metric quantifies the increase in the expected (average) value outcome of a decision. The decision is made with a certain type of additional information, compared to if the decision was made without the information. VOI has challenges that are similar to those faced by machine learning enthusiasts. Labeled data sets are needed in which the labels are the decision variables and the features are the geophysical observables. This paper presents three examples of how the statistical relationship, or reliability, may be calculated for geothermal exploration applications. VOI provides a way to document successes and identify opportunities for improvement in derisking geothermal prospecting with geophysical information.

APA, Harvard, Vancouver, ISO, and other styles

32

Cobos, Jacquelin E., Christen Knudby, and Erik G. Søgaard. "A Geothermal Plant from a Time-Scale Perspective." Energies 14, no. 19 (September 24, 2021): 6096. http://dx.doi.org/10.3390/en14196096.

Full text

Abstract:

In recent years, geothermal energy use from low-temperature sandstone reservoirs has sharply increased. Nonetheless, the injection of heat-depleted geothermal fluids has not been an easy task because of well/formation damage and operational/economic issues. Sønderborg geothermal plant is a case example of heat-mining from a low-temperature reservoir. It is in the northeast of Sønderborg towards Augustenborg Fjord. The present work takes into consideration the regional and local geology of the Sønderborg area, construction of the wells, field experience and water chemistry. The main issues of the geothermal plant appear to be related to the construction of the wells and reinjection of the heat-depleted brine. Our water chemistry analysis and PHREEQC simulations indicate that geothermal brine was saturated with respect to carbonate and barite minerals. The excess of Ca2+ and SO42− ions could have led to the formation and precipitation of carbonate and sulfate scales. Moreover, the increment of iron concentration over time could suggest the ingress of oxygen and pitting corrosion due to the presence of halide ions.

APA, Harvard, Vancouver, ISO, and other styles

33

Siregar, Ahmat Munawir, Ira Kusuma Dewi, and Ngatijo Ngatijo. "Identifikasi Batuan Granit Daerah Prospek Panas Bumi Nyelanding menggunakan Metode Magnetik." Science, and Physics Education Journal (SPEJ) 4, no. 2 (June 27, 2021): 62–69. http://dx.doi.org/10.31539/spej.v4i2.2388.

Full text

Abstract:

This study aimed to identify granite rocks around the Nyelanding geothermal area, especially in the geothermal manifestations. This research used the magnetic method to analyze the subsurface structure of the geothermal area. Correction of magnetic data was performed in Microsoft excel 2010 software and two-dimensional modeling was performed using Oasis Montaj 8.4. The results showed that there are three layers of rock under Nyelanding hot springs, namely granite with a susceptibility of 0.009 - 0.05 SI to a depth of 500 meters and a layer of sandstone - clay, as well as layers of clay, gravel and silt with a susceptibility of 0.00001 - 0, 00005 SI. In conclusion, the local geology of the Nyelanding hot spring area is dominated by the presence of granite to a depth of 500 meters. The results of forward modeling on layers A-A' and C-C' show the subsurface structure of Nyelanding hot springs in the form of a granite rock basin which is estimated to be able to accumulate geothermal energy. Key words: Nonvolcanic Geothermal, Magnetic Method, Granite Susceptibility, Forward Modeling

APA, Harvard, Vancouver, ISO, and other styles

34

Zui, Vladimir I., Dmitriy N. Andreyev, and Khikmatilla Kh Rakhmatullayev. "Heat flow of Uzbekistan: geology and interpretation." Journal of the Belarusian State University. Geography and Geology, no. 1 (May 29, 2020): 95–105. http://dx.doi.org/10.33581/2521-6740-2020-1-95-105.

Full text

Abstract:

The first determinations of the heat flow density in Uzbekistan, as well as in Central Asia as a whole, were carried out in the middle 1960s. In subsequent years, many researchers, primarily in connection with the search and exploration of oil and natural gas deposits, studied the geothermal field of the region. The data accumulated to date show a significant heterogeneity of the thermal field in both Uzbekistan and the adjacent territory of Central Asia. Rare wells were studied in the desert areas of Kyzyl Kum and Kara Kum. The heat flow in Uzbekistan varies over a wide range from 20–30 to approximately 100 mW/m2. Its high values are characteristic of intermountain depressions and blocks of the earth’s crust with a dense network of deep faults. The heat flow increases significantly in the southern and eastern parts of Uzbekistan, as well as in the neighbouring territories adjacent to the mountain structures of the Tien Shan and Pamir, characterized by high seismicity, tectonic and thermal activation. An updated map of the heat flow density of Uzbekistan was compiled and, separately for the Fergana Depression. They reflect a significant regional variability of the geothermal field. With the transition from the relatively flat territory of the Turanian Plate to mountain structures, the degree of differentiation by the heat flow increases significantly. This is typical of the entire orogenic Alpine-Himalayan Belt.

APA, Harvard, Vancouver, ISO, and other styles

35

Burchardt, Steffi, Mohsen Bazargan, Einar Bessi Gestsson, Christoph Hieronymus, Erika Ronchin, Hugh Tuffen, Michael J. Heap, et al. "Geothermal potential of small sub-volcanic intrusions in a typical Icelandic caldera setting." Volcanica 5, no. 2 (December 12, 2022): 477–507. http://dx.doi.org/10.30909/vol.05.02.477507.

Full text

Abstract:

Geothermal exploration targets large magmatic intrusions as heat sources because of their size, longevity, and amount of stored energy, but as shallow volcanic plumbing systems comprise numerous smaller intrusions, their geothermal potential warrants consideration. Here, we evaluate the geothermal impact of dykes and sills on caldera-infill rocks. We present geological data and geothermometry on intrusions in the eroded Breiðuvík caldera in Northeast Iceland, which serves as an analogue to the active, and geothermally exploited, Krafla volcano. These data inform 2D finite element models of dyke and sill intrusions that consider heat transfer in porous media. Our results indicate that small intrusions create considerable thermal anomalies in their immediate vicinity. These anomalies are larger-magnitude and longer-lasting for individual thick sills and dykes, but networks of smaller sills and dykes emplaced close in time and space can create more widespread thermal anomalies that may be viable economic targets for decades after their emplacement.

APA, Harvard, Vancouver, ISO, and other styles

36

Pluymaekers, M. P. D., L. Kramers, J. D. van Wees, A. Kronimus, S. Nelskamp, T. Boxem, and D. Bonté. "Reservoir characterisation of aquifers for direct heat production: Methodology and screening of the potential reservoirs for the Netherlands." Netherlands Journal of Geosciences - Geologie en Mijnbouw 91, no. 4 (December 2012): 621–36. http://dx.doi.org/10.1017/s001677460000041x.

Full text

Abstract:

AbstractGeothermal low enthalpy heat in non-magmatic areas can be produced by pumping hot water from aquifers at large depth (>1 km). Key parameters for aquifer performance are temperature, depth, thickness and permeability. Geothermal exploration in the Netherlands can benefit considerably from the wealth of oil and gas data; in many cases hydrocarbon reservoirs form the lateral equivalent of geothermal aquifers. In the past decades subsurface oil and gas data have been used to develop 3D models of the subsurface structure. These models have been used as a starting point for the mapping of geothermal reservoir geometries and its properties. A workflow was developed to map aquifer properties on a regional scale. Transmissivity maps and underlying uncertainty have been obtained for 20 geothermal aquifers. Of particular importance is to take into account corrections for maximum burial depth and the assessment of uncertainties. The mapping of transmissivity and temperature shows favorable aquifer conditions in the northern part of the Netherlands (Rotliegend aquifers), while in the western and southern parts of the Netherlands aquifers of the Triassic and Upper Cretaceous / Jurassic have high prospectivity. Despite the high transmissivity of the Cenozoic aquifers, the limited depth and temperature reduce the prospective geothermal area significantly.The results show a considerable remaining uncertainty of transmissivity values, due to lack of data and heterogeneous spatial data distribution. In part these uncertainties may be significantly reduced by adding well test results and facies parameters for the map interpolation in future work. For underexplored areas this bears a significant risk, but it can also result in much higher flowrates than originally expected, representing an upside in project performance.

APA, Harvard, Vancouver, ISO, and other styles

37

Sulistyanto, Rakhmadi, Udi Harmoko, and Gatot Yuliyanto. "Geothermal Systems Characteristics in Pesanggrahan Area, Bawang Distric, Batang Regency, Based on Geology and Geochemistry Analysis." E3S Web of Conferences 125 (2019): 14002. http://dx.doi.org/10.1051/e3sconf/201912514002.

Full text

Abstract:

Research conducted at Pesanggrahan area, Sangubanyu Village, Bawang District, Batang Regency with geographical coordinates at 7°5'00 "00 S - 7°7'30" 00 S, and 109 ° 56'00 "E-109°58'30"E, with an area of around 25 Km². Research methods used quantitative and qualitative methods with descriptive analysis, geological and geochemical analysis. Geochemical fluid samples were taken in manifestations hot springs Pesanggrahan and hot water samples in Sibanteng and Sileri Crater to determine the relationship with geothermal systems in this area. Geomorphology divided into two geomorphology units, they are steep slope and sloping hill. Stratigraphy can be divided into three lithologies, which are andesite breccia, tuff breccia, and tuff sandstone. Based on fluid geochemical characteristics of manifestations, it can be interpreted that hot spring of Pesanggrahan area is outflow zone with bicarbonate-chloride water type, Sibanteng Crater and Sileri Crater, include upflow zone with water type sulfate for Sibanteng Crater, bicarbonate-sulfide water type for Sileri Crater. Environmental source geothermal fluid Pesanggrahan from the magmatic volcanic process. Sources geothermal fluid in Pesanggrahan, Sibanteng and Sileri Crater from meteoric water. Estimated temperature Pesanggrahan in the interval 50-100°C, Sileri Craters 160-180°C, and Sibanteng Craters 140-150°C. The Conceptual model of Pesanggrahan includes a geothermal system that associated with volcanic system and high relief liquid dominated system.

APA, Harvard, Vancouver, ISO, and other styles

38

Scott, Graeme L. "Heat source for Tongonan Geothermal Field." Island Arc 9, no. 4 (July 18, 2008): 513–26. http://dx.doi.org/10.1111/j.1440-1738.2000.00298.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Scott, Graeme L. "Heat source for Tongonan Geothermal Field." Island Arc 9, no. 4 (December 2000): 513–26. http://dx.doi.org/10.1046/j.1440-1738.2000.00298.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Il'in, V. A. "ACTIVE GEOTHERMAL PROCESSES AND CRUSTAL ENERGETICS." International Geology Review 28, no. 11 (November 1986): 1262–68. http://dx.doi.org/10.1080/00206818609466362.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

DOWNING, R. A., and D. A. GRAY. "Geothermal resources of the United Kingdom." Journal of the Geological Society 143, no. 3 (May 1986): 499–507. http://dx.doi.org/10.1144/gsjgs.143.3.0499.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Bloomquist, R. Gordon. "Geothermal space heating." Geothermics 32, no. 4-6 (August 2003): 513–26. http://dx.doi.org/10.1016/j.geothermics.2003.06.001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Guglielminetti, Massimiliano. "Mofete geothermal field." Geothermics 15, no. 5-6 (January 1986): 781–90. http://dx.doi.org/10.1016/0375-6505(86)90091-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Ármannsson, Halldór, and Hrefna Kristmannsdóttir. "Geothermal environmental impact." Geothermics 21, no. 5-6 (October 1992): 869–80. http://dx.doi.org/10.1016/0375-6505(92)90038-b.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Chenet, P. Y. "Organic metamorphism and geothermal history." Marine and Petroleum Geology 6, no. 2 (May 1989): 190. http://dx.doi.org/10.1016/0264-8172(89)90022-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Patrier, Patricia, Sylvain Bruzac, Rebecca Pays, Daniel Beaufort, Vincent Bouchot, Chrystèle Verati, and Alain Gadalia. "Occurrence of K-feldspar-bearing hydrothermal breccias in the Bouillante geothermal field (Basse Terre – Guadeloupe)." Bulletin de la Société Géologique de France 184, no. 1-2 (January 1, 2013): 119–28. http://dx.doi.org/10.2113/gssgfbull.184.1-2.119.

Full text

Abstract:

Abstract Surficial indicators of recent to present geothermal activity are present around Bouillante (Guadeloupe, French West Indies). Until lately, most mineralogical parageneses identified in this area were typical of low temperature alteration (< 100°C) with the occurrence of dioctahedral aluminous smectites accompanied by zeolites (heulandite-clinoptilolite) ± calcite ± silica ± kaolinite, as an evidence of the cap rock of the geothermal system. Recently, numerous boulders of highly silicified breccias containing high temperature minerals (> 200°C) have been identified in the Bouillante bay (Anse Marsolle). Their petrographic study revealed several hydrothermal parageneses typical of a multistage alteration process. Stage 1) An early potassic alteration facies typical of a high-temperature geothermal system characterized by K-feldspar/adularia + quartz + pyrite. K-feldspars have been shown to be present both in the clasts (replacement) and cement of these breccias. They are associated with quartz whose textural properties have revealed fracturing associated with boiling. Stage 2) An acid-sulphate advanced argillic alteration facies with the occurrence of jarosite, gypsum ± silica (≥ 150°C) as usually observed in the upper part of epithermal systems worldwide as marker of deeper boiling. Stage 3) An argillic alteration facies (illite/smectite mixed layers ± smectite ± calcite). With temperatures typically ranging from 100 to 200°C, this alteration facies is associated with near neutral fluids of mainly meteoric origin as known in the present geothermal reservoir (pH = 5.4). This alteration is the later one as evidenced by petrographic observations. These results highlight mineral assemblages and mineral textures characteristic of high temperature hydrothermal alteration in epithermal settings. The occurrence of these breccias involved the existence of eruptive events (magmatic/hydrothermal explosion) which ejected this material. Isotopic (oxygen, argon) and geochemical (trace elements) studies are now necessary to clarify the timing of these breccias and the nature and the connection of the original fluids with current geothermal fluids

APA, Harvard, Vancouver, ISO, and other styles

47

Singh, Hemant Kumar, D. Chandrasekharam, A. Minissale, N. Janardhana Raju, and A. Baba. "Geothermal potential of Manuguru geothermal field of Godavari valley, India." Geothermics 105 (November 2022): 102545. http://dx.doi.org/10.1016/j.geothermics.2022.102545.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Garg, Sabodh K., John W. Pritchett, Philip E. Wannamaker, and Jim Combs. "Characterization of geothermal reservoirs with electrical surveys: Beowawe geothermal field." Geothermics 36, no. 6 (December 2007): 487–517. http://dx.doi.org/10.1016/j.geothermics.2007.07.005.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Bertelsmeier, Wolfgang, and Janet A. Koch. "Geothermal: Energy for development—The World Bank and Geothermal development." Geothermics 15, no. 5-6 (January 1986): 559–64. http://dx.doi.org/10.1016/0375-6505(86)90065-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Allo, Fabien, Jean-Philippe Coulon, Jean-Luc Formento, Romain Reboul, Laure Capar, Mathieu Darnet, Benoit Issautier, Stephane Marc, and Alexandre Stopin. "Characterization of a carbonate geothermal reservoir using rock-physics-guided deep neural networks." Leading Edge 40, no. 10 (October 2021): 751–58. http://dx.doi.org/10.1190/tle40100751.1.

Full text

Abstract:

Deep neural networks (DNNs) have the potential to streamline the integration of seismic data for reservoir characterization by providing estimates of rock properties that are directly interpretable by geologists and reservoir engineers instead of elastic attributes like most standard seismic inversion methods. However, they have yet to be applied widely in the energy industry because training DNNs requires a large amount of labeled data that is rarely available. Training set augmentation, routinely used in other scientific fields such as image recognition, can address this issue and open the door to DNNs for geophysical applications. Although this approach has been explored in the past, creating realistic synthetic well and seismic data representative of the variable geology of a reservoir remains challenging. Recently introduced theory-guided techniques can help achieve this goal. A key step in these hybrid techniques is the use of theoretical rock-physics models to derive elastic pseudologs from variations of existing petrophysical logs. Rock-physics theories are already commonly relied on to generalize and extrapolate the relationship between rock and elastic properties. Therefore, they are a useful tool to generate a large catalog of alternative pseudologs representing realistic geologic variations away from the existing well locations. While not directly driven by rock physics, neural networks trained on such synthetic catalogs extract the intrinsic rock-physics relationships and are therefore capable of directly estimating rock properties from seismic amplitudes. Neural networks trained on purely synthetic data are applied to a set of 2D poststack seismic lines to characterize a geothermal reservoir located in the Dogger Formation northeast of Paris, France. The goal of the study is to determine the extent of porous and permeable layers encountered at existing geothermal wells and ultimately guide the location and design of future geothermal wells in the area.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Geothermal geology'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles