Dissertations / Theses on the topic 'Geothermal geology'
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Malkemus, Donnel Alexander. "Geothermometry of Two Cascade Geothermal Systems." PDXScholar, 2016. https://pdxscholar.library.pdx.edu/open_access_etds/3369.
Full textSavage, Shannon Lea. "Mapping changes in Yellowstone's geothermal areas." Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/savage/SavageS0809.pdf.
Full textSpake, Phillip. "Geothermal Exploration North of Mount St. Helens." Master's thesis, Temple University Libraries, 2019. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/585881.
Full textM.S.
Active seismicity and volcanism north of Washington state’s Mount St. Helens provide key ingredients for hydrothermal circulation at depth. This broad zone of seismicity defines the St. Helens Seismic Zone, which extends well north of the volcanic edifice below where several faults and associated fractures in outcrop record repeated slip, dilation, and alteration indicative of localized fluid flow. Candidate reservoir rocks for a geothermal system include marine metasediments overlain by extrusive volcanics. The colocation of elements comprising a geothermal system at this location is tested here by analysis of the structures potentially hosting a reservoir, their relationship to the modern stress state, and temperature logs to a depth of 250 m. Outcrop mapping and borehole image log analysis down to 244 m document highly fractured volcaniclastic deposits and basalt flows. Intervening ash layers truncate the vertical extent of most structures. However, large strike slip faults with well-developed fault cores and associated high fracture density cross ash layers; vein filling and alternation of the adjacent host rock in these faults suggest they act as vertically extensive flow paths. These faults and associated fractures record repeated slip, dilation, and healing by various dolomite, quartz, and hematite, as well as clay alteration, indicative of long-lived, localized fluid flow. In addition, where these rocks are altered by igneous intrusion, they host high fracture density that facilitated heat transfer evidenced by associated hydrothermal alteration. Breakouts in image logs indicate the azimuth of SHmax in the shear zone is broadly consistent with both the GPS plate convergence velocity field as well as seismically active strike slip faults and strike-slip faults mapped in outcrop and borehole image logs. However, the local orientation of SHmax varies by position relative to the edifice and in some cases with depth along the borehole making a simple regional average SHmax azimuth misleading. Boreholes within the seismic zone display a wider variety of fracture attitudes than those outside the shear zone, potentially promoting permeability. Temperature profiles in these wells all indicate isothermal conditions at average groundwater temperatures, consistent with rapidly flowing water localized within fractures. Together, these results indicate that the area north of Mount Saint Helens generates and maintains porosity and permeability suggesting that conditions necessary for a geothermal system are present, although as yet no modern heat source or hydrothermal circulation was detected at shallow depth.
Temple University--Theses
Varriale, Jerome A. "The MH-2 Core from Project Hotspot: Description, Geologic Interpretation, and Significance to Geothermal Exploration in the Western Snake River Plain, Idaho." DigitalCommons@USU, 2016. https://digitalcommons.usu.edu/etd/4677.
Full textMiller, Joshua K. "A conceptual model of the Pilgrim Hot Springs geothermal system, Seward Peninsula, Alaska." Thesis, University of Alaska Fairbanks, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1550238.
Full textThis work has developed a conceptual geological model for the Pilgrim Hot Springs geothermal system supporting the exploration, assessment and potential development of this resource for direct use and electric power production. The development of this model involved the analysis of a variety of subsurface and geophysical data and the construction of a 3D lithostratigraphic block model. Interpretation of the data and block model aimed to establish the most likely scenario for subsurface geothermal fluid flow. As part of this work, well cuttings were analyzed for permeability and correlated with geophysical logs from well to well to constrain the stratigraphic architecture of the unconsolidated sediments. Hydrothermal alteration of the sediments and bedrock core was also studied through reflectance spectroscopy and methylene blue titration in order to investigate past fluid migration pathways. The structure of the basin was interpreted through geophysical surveys including aeromagnetic resistivity, isostatic gravity, and magnetotelluric resistivity. Based on temperature, well logs, geophysical surveys, and lithologic data, the system is subdivided into a shallow outflow aquifer and a deeper reservoir beneath a clay cap connected by a conduit with 91°C hydrothermal fluid upflow. Stratigraphic correlations indicate several clay layers throughout the section with a dominant clay cap at 200-275 m depth. Extensive pyritization and the clay mineral assemblage suggest an argillic-style alteration facies indicative of past temperatures at or slightly elevated above current conditions of hydrothermal activity at Pilgrim Hot Springs. The conceptual model supports production from this resource in those subsurface zones where there is sufficient permeability and connectivity with the upflow zone.
Faizy, Shelly Mardhia. "Assessing a Modeling Standard in Volcanic-Geothermal Systems: the Effects of the Lower System Boundary." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-438664.
Full textMcLachlan, Holly S. "Stratigraphy, Structure, and Fluid Flow at the Soda Lake Geothermal Field, Western Nevada, USA." Thesis, University of Nevada, Reno, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10841261.
Full textThis study assessed the geologic setting of the Soda Lake geothermal field, which lies in the southern part of the Carson Sink basin of northwestern Nevada within the Basin and Range of the western USA. The Basin and Range is a world-class geothermal province with significant untapped potential, particularly in blind (no surface hot springs or steam vents) geothermal systems. Blind systems probably comprise the majority of geothermal resources in the region, with many lying buried under thick accumulations of sediments in the broad basins that make up >50% of the province. Locating fault-hosted blind geothermal systems in these basins is challenging, and identifying the most prospective parts of these systems is even more demanding. The Soda Lake geothermal field is one of the more deeply buried known systems in this region. This study was undertaken to elucidate the stratigraphic and structural framework of the Soda Lake field, and to determine the probable controls on fluid flow in the production areas. Due to the depth of basin-fill sediments at the Soda Lake field, the structural setting and specific controls on fluid flow are not discernable at the surface. However, the Soda Lake geothermal field has produced electricity for over 30 years, and a wealth of subsurface data has been acquired since the field was first targeted for geothermal exploration in 1972-73. The abundant well data and geophysical surveys in particular provided a foundation for investigation of the geologic setting of the field.
This study was divided into three major parts. In the initial part of the study, a stratigraphic framework was developed for the Soda Lake area from analysis of cuttings, borehole geophysical logs, and radiometric dates of key igneous units. It was validated against exposed stratigraphic sections in the surrounding ranges and interpreted basin-fill sections derived from wells across the Carson Sink basin. Pursuant to this in the second part of the study, a comprehensive 3D geologic model of the Soda Lake field was construct from three inputs: 1) the new stratigraphic framework model, 2) bedding attitude estimates from seismic reflection surveys and borehole logs, and 3) a fault framework derived from both well data and geophysical surveys. The Soda Lake fault framework had been modeled from seismic reflection and borehole data in previous studies. In this study, one of the seismic fault pick sets was enhanced along strike and extended to >2 km depth using well data and forward modeled gravity. This enhanced fault framework served as the initial input to the Soda Lake geologic model. A ‘horizon model’ based on stratigraphic well intercepts and attitude data was then built around the fault framework to generate a 3D geologic block model for the Soda Lake field. In the final phase of this study, the Soda Lake temperature anomaly was modeled in a series of cross-sections extracted from the geologic model. The temperature anomaly was interpreted in context with the geologic model and production data in order to identify the main upwelling and outflow conduits. Key controls on fluid upwelling and probable fluid flow pathways were catalogued based on the spatial relationship between the temperature anomaly and the geologic model of the field area.
There are three major stratigraphic divisions at the Soda Lake geothermal field. The field is situated in and beneath ∼900-1100 m of unconsolidated basin-fill sediments. The basin-fill section is divided into an upper 300-500 m thick, relatively coarse-grained, quartzo-feldspathic unit, and a lower ∼150-300 m thick mud-rich unit. The unconsolidated basin fill is interrupted by a 5.1 Ma trachyandesite body that is up to ∼750 m thick in the central part of the Soda Lake well field. The body consists of a buried vent edifice near one of the main production wells, 50-90 m thick outflow aprons, and a conical root on the west side of the well field that can be traced to the Miocene bedrock contact. About 1 km of Miocene bedrock underlies the basin-fill section. The Miocene bedrock section is dominated by mafic lavas, interbedded with lesser tuff, clastic sedimentary rocks, and minor limestone. No early Miocene or Oligocene strata have been found at the Soda Lake field area. The middle to late Miocene section overlies Triassic-Jurassic metamorphic basement and Jurassic-Cretaceous granite. (Abstract shortened by ProQuest.)
Kent, Tyler. "Comparing Deformation at Soda Lake Geothermal Field from GPS and 3D Seismic." Thesis, University of Nevada, Reno, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1540191.
Full textThe transition between the two distinct structural regimes of the Walker Lane and the Basin and Range allows for complex transtensional fault interactions. The Carson Sink is the surface expression of the interaction of shear and extensional strains that cause both crustal extension and block rotation. This study investigates this tectonic shift at the Soda Lake geothermal field by comparing the direction and rate of deformation from both regional GPS and a 34 sq km 3D seismic survey. The GPS stations in the region estimate the strain field by comparing tensor solutions that show changing direction and magnitude of strain across the Carson Sink. Using stations surrounding the Soda Lake 3D seismic survey, the strain tensor produced is comparable in orientation to Basin and Range strain but has larger magnitudes. To quantify deformation within the Soda Lake 3D seismic survey, we calculate fault dip and offset of a deformed paleo-planer lacustrine mudstone. Plotting the mean dip direction of the faults in the seismic reflectivity, matches the mean surrounding GPS extensional direction, suggesting fault displacement is likely to be normal dipslip. Using a minimum age of 0.51 Ma from nearby sedimentation rates, the measured extension across the 5.4 km length of this study has a rate of 0.19 mm/yr. This is quite a high value for Basin and Range extension and it is likely a result of some influence from the Northern Walker Lane. The lack of an obvious piercing point for shear observed within the seismic volume precludes a clear estimate of strike-slip related motion within the Soda Lake 3D seismic survey. Clear extension and a large fault bend, indicates a localized relay ramp model. With focused extension indicated by two late Quaternary extrusive volcanic bodies, a model of a transtensional pull-apart basin is also considered. Given the few mapped intrabasinal faults at the surface, this study gives a unique view into fault offsets inside the Carson Sink.
Gestsson, Einar Bessi. "Geothermal Potential of Sub-Volcanic Intrusions in a Typical Caldera Setting." Thesis, Uppsala universitet, Mineralogi, petrologi och tektonik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-354072.
Full textVulkaner är en viktig energikälla i många länder runt om i världen. Geotermisk vätska och ånga av högtemperatur som finns i vulkanområden kan utnyttjas för bland annat elproduktion och fjärrvärme. Värmekällan till de geotermiska områdena är magma som ligger ytligt i jordskorpan. All magma når inte ytan i utbrott, utan stannar under vulkanen i form av magmaintrusioner. Intrusionerna av olika former och storlekar utgör ett nätverk som tillsammans utgör vulkanens magma transportsystem. I denna studie studeras en uppsättning av magmaintrusioner på nordöstra Island. Intrusionerna har en gång befunnit sig längre ner i jordskorpan under ett aktivt vulkanområde men exponeras nu vid ytan på grund av glacial erosion. Intrusionernas storlek och form varierar, men de flesta återfinns som gångar, både vertikala och horisontella. När en magmatintrusion bildas värms omkringliggande berggrund och grundvatten upp. Studiens fokus är att undersöka hur temperaturfördelningen i omgivningen skiljer sig vid en stor intrusion jämfört med flera mindre intrusioner med totalt samma volym. Även effekten från olika typer av berggrund runt intrusionerna studerades genom att jämföra temperaturfördelningen och kylningstiderna för intrusioner i tre vanliga bergarter. Numerisk modellering användades för att besvara dessa frågor. Bergarternas fysiska och termiska egenskaper krävdes som ingångsparametrar för den numeriska modelleringen. Parametrana uppskattades genom laboratorieexperiment och termometriberäkningar från fältprover. Värden från publicerat material användes också i modelleringen. Resultaten från den numeriska modelleringen antyder att högre maximivärden för temperaturen nås i berget över en stor, enskild intrusion jämfört med flera mindre intrusioner. När man jämför vertikala og horisontella gångar, ökar de vertikala gångarna berggrundens temperatur mer än de horisontella, medan medeltemperaturen ökar mer över horisontella gångar än i vertikala gångar. Trots den numeriska modellens förenklade struktur är förhoppningen att den nya datan kan inspirera vidare forskning, och bidra till en bättre förståelse om förhållandet mellan grunda magmaintrusioner och geotermiska system.
Skog, Gabriella. "Current Status and Future Outlook of Geothermal Reinjection: A Review of the Ongoing Debate." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-383963.
Full textHuebner, Laura E. "Investigations of the Steamboat Hills geothermal reservoir beneath the University of Nevada, Reno's Redfield campus using shallow geophysical techniques /." abstract and full text PDF (UNR users only), 2009. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1461543.
Full text"December, 2008." Includes bibliographical references (leaves 82-85). Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2009]. 1 microfilm reel ; 35 mm. Online version available on the World Wide Web.
Atkinson, Trevor Alex. "Geochemical Characterization of the Mountain Home Geothermal System." DigitalCommons@USU, 2015. https://digitalcommons.usu.edu/etd/4599.
Full textSant, Christopher Joseph. "Geothermal Alteration of Basaltic Core from the Snake River Plain, Idaho." DigitalCommons@USU, 2012. https://digitalcommons.usu.edu/etd/1451.
Full textLaboso, Roselyne Cheptoo. "Fault-Controlled Damage and Permeability at the Brady Geothermal System, Nevada, U.S.A." Master's thesis, Temple University Libraries, 2016. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/413206.
Full textM.S.
Identifying and locating permeable zones in geothermal fields is a critical step in determining reservoir potential and realizing energy production. Despite a general association with active faults, geothermal systems typically display heterogeneously distributed permeability that makes locating successful wells difficult. Faults are associated with complex distributions of secondary fractures, with variable attitude, fracture density, and connectivity – all of which can influence permeability. Simulations of the local stress state due to slip on a detailed model of the fault system at Brady Geothermal Field, NV, supported by models of key idealized fault geometries, are used to test the relationship between both productive wells or hydrothermal features and failed wells with stress states that promote or suppress fracture. These simulations show that hydrothermal features are generally associated with portions of faults best oriented to slip in the stress state measured at Brady. Critically, regions of enhanced coulomb stress (S_c^((max))) and reduced least compressive principal stress (σ3) that promote fractures occur at narrow, extensional relays and at intersections between faults; at Brady such locations correlate with the locations of production wells and hydrothermal surface manifestations. Despite this positive correlation, several of these structures do not host evidence of hydrothermal flow due to a lack of persistence along the dip of the fault necessary to connect to the heat source at depth. In contrast, regions of reduced S_c^((max)) and enhanced σ3 correspond to volumes that lie near the interior of faults, including at bends and at contractional relays. These locations are generally associated with failed wells; however, major production wells occur at a clear bend in a large fault at Brady. This may reflect the origin of the bend as breached relay and warrants further investigation.
Temple University--Theses
Avsar, Ozgur. "Geochemical Evaluation And Conceptual Modeling Of Edremit Geothermal Field." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12612903/index.pdf.
Full textC discharge temperatures is utilized for space heating. Alternation of permeable and impermeable units created two superimposed aquifers in the area: upper unconfined and lower confined. Water samples from 21 (hot, warm, cold) wells were taken in this study. 8 of these wells penetrate the deeper confined, while 13 penetrate the shallower unconfined aquifer. Geochemical analysis revealed Na+K&ndash
SO4 nature for the hot (>
40°
C), Ca&ndash
HCO3 nature for the cold (<
30°
C) and Ca&ndash
SO4 nature for the warm (30-40°
C) waters. &delta
18O-&delta
D compositions point to a meteoric origin for all waters, while 14C analyses suggest longer subsurface residence times for the hot, compared to the cold/warm waters. Chemical and isotopic compositions indicate that &ldquo
mixing&rdquo
and &ldquo
water-rock interaction&rdquo
are the possible subsurface processes. When silica and cation geothermometers are evaluated together with fluid mineral equilibria calculations, a 110°
C reservoir temperature is expected in the field. Saturation indices indicate potential silica scaling for waters at temperatures lower than discharge temperatures. Hydrogeology of the study area is highly affected by faults. The groundwater is percolated (down to 3 km depth) via deep seated step faults, heated at depth and ascends to surface at the low lands, especially through intersection of buried, mid-graben faults. During its ascent towards surface, geothermal water invades the two superimposed aquifers and mixing between hot and cold waters takes place in the aquifers. Resource assessment studies suggest a 3.45x1013 kJ accessible resource base and 9.1 MWt recoverable heat energy for Edremit geothermal field with 90% probability.
Asher, Cameron Michael. "Carbon and nitrogen isotopes in lichen as a geothermal exploration tool." Thesis, University of Canterbury. Geological Sciences, 2014. http://hdl.handle.net/10092/9651.
Full textGuducu, Hatice. "Geological, Hydrogeological And Geochemical Analyses Of The Geothermal Systems In The Buyuk Menderes Graben." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12615115/index.pdf.
Full textespecially Western Anatolia is a promising region in terms of its highest energy. Bü
yü
k Menderes Graben system is a tectonically active extensional region and is undergoing a N&ndash
S extension leading to form geothermal fields in the graben. In the last decade, geothermal exploration, investigations and investments have been increased rapidly through the law related to geothermal energy assigned. The aim of this study is to analyze the geothermal fields located in the graben system in order to investigate their geological, hydrogeological and geochemical features and reservoir characteristics. A data set is compiled from the accessible archives, published papers and documents and several variables have been searched at every field in the graben. The variables include the fluid temperature, the distance to sea, the depth to the reservoir, the reservoir lithology, the chemical constituents, etc. In view of these variables the fields are compared and constrasted and their common characterisrics have been noted. Interpretation of the data set reveals that the fields have some common features and characters however some fields have got notable differences.
Tufekci, Nesrin. "Gis Based Geothermal Potential Assessment For Western Anatolia." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607651/index.pdf.
Full textRiml, Joakim. "Prestandaförändringen hos en bergvärmeanläggning efter fem års drifttid." Thesis, Uppsala University, Department of Earth Sciences, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-88901.
Full textThe aim of this report was to do a case study at a geothermal heating system which has been in operation for about 5 years, and study if its performance has changed during this period of time. A literature study about the processes involved was also done in purpose of background knowledge.
The tenant-owner’s association Duvan at Petterslundsgatan in Uppsala installed year 1999-2000 a geothermal heating system. The purpose of this installation was that they hoped it would lead to a smaller usage of district heating which would lead to a reduction of the heating expenses for their buildings. The geothermal heating system consists of 19 energy wells and 4 geothermal heat pumps, and it is one of the first systems of that size in the region of Uppsala. Due to that, the system at Duvan is referred to as a reference project for geothermal heating system of this size. The reason that the study was made after 5 years is that it takes about 5 years before the heat equilibrium in the bedrock has been stabilized after a geothermal heat system has been installed. The temperature in the bedrock will decrease during this 5 year period and the performance of the system will change.
In this report factors such as geology, groundwater levels and temperature changes are examined to get a summery of the processes that extract heat from the bedrock and convert it to conventional energy. Data from the compressors has been examined, energy usage before and after the installation of the system has been compared and finally an economical calculation of the tenant-owner’s association energy consumption has been made. All the main points in this report point to the fact that the system is working properly and that it has contributed to an economical benefit regarding to the energy usage.
Syftet med detta examensarbete var att göra en fallstudie på ett befintligt bergvärmesystem som har varit i drift i 5 år, och studera om dess prestanda har förändrats under den tid som systemet använts. Som bakgrund genomfördes även en litteraturstudie över de processer som äger rum då geotermisk energi kan utvinnas samt hur denna energi konverteras till konventionell energi för uppvärmning av lokaler.
Bostadsrättsföreningen Duvan på Petterslundsgatan i Uppsala installerade under år 1999-2000 ett bergvärmesystem som skulle leda till ett mindre användande av fjärrvärme och således bidra till att utgifterna för inköp av energi skulle minska. Systemet består av 19 energibrunnar och 4 värmepumpar, och är en av de första anläggningarna av denna storlek i Uppsala regionen. Detta gör att Bostadsrättsföreningen Duvan ses som ett referensobjekt för anläggningar av denna storlek. Anledningen till att studien gjordes vid denna tidpunkt var att det tar ungefär 5 år innan värmebalansen i berggrunden stabiliseras när ett bergvärmesystem installeras, och temperaturen i berggrunden kommer under denna period minska vilket leder till prestandaförändringar hos värmepumpen. Denna femårsperiod har nu gått och en relevant undersökning av systemet har kunnat göras.
I denna rapport beskrivs bakomliggande parametrar så som geologi, grundvattennivåer och temperaturförändringar som behövs för att få en överblick över situationen och kunna ge en inblick i vad som påverkar utvinningen av energi i berggrunden. Data från kompressorernas drifttider och förbrukning av energi före och efter installationen av bergvärmesystemet jämförs och slutligen görs en ekonomisk kalkyl för bostadsrättsföreningens energiförbrukning. Alla de punkter som rapporten undersöker visar att systemet fungerar väl och att det bidragit till en ekonomisk vinst med avseende på energianvändandet.
Hawkins, Adam J. "Measurement of the spacial distribution of heat exchange in a geothermal analog bedrock site using fiber-otic distributed temperature sensing." Thesis, California State University, Long Beach, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1527320.
Full textLaw, Ryan. "Geothermal systems in the Chalk of the south east of England : methods of predicting thermal transport in a fractured aquifer." Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/981/.
Full textFreeman, Thomas G. "Evaluation of the Geothermal Potential of the Snake River Plain, Idaho, Based on Three Exploration Holes." DigitalCommons@USU, 2013. https://digitalcommons.usu.edu/etd/2020.
Full textSt, John Anna Maria. "Hydrogeochemical Characterization of the Alvord Valley Known Geothermal Resources Area, Harney County, Oregon." PDXScholar, 1993. https://pdxscholar.library.pdx.edu/open_access_etds/2678.
Full textSwyer, Michael Wheelock. "Evaluating the role of the Rhyolite Ridge Fault System in the Desert Peak Geothermal Field, NV: Boundary Element Modeling of Fracture Potential in Proximity of Fault Slip." Master's thesis, Temple University Libraries, 2013. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/214817.
Full textM.S.
Slip on the geometrically complex Rhyolite Ridge Fault System and associated local stresses in the Desert Peak Geothermal Field in Nevada, were modeled with the boundary element method (BEM) implemented in Poly3D. The impact of uncertainty in the fault geometry at depth, the tectonic stresses driving slip, and the potential ranges of frictional strength resisting slip on the likely predictions of fracture slip and formation in the surrounding volume due to these local stresses were systematically explored and quantified. The effect of parameter uncertainty was evaluated by determining the frequency distribution of model predicted values. Alternatively, Bayesian statistics were used to determine the best fitting values for parameters within a probability distribution derived from the difference of the model prediction from the observed data. This approach honors the relative contribution of uncertainties from all existing data that constrains the fault parameters. Lastly, conceptual models for different fault geometries and their evolution were heuristically explored and the predictions of local stress states were compared to available measurements of the local stresses, fault and fracture patterns at the surface and in boreholes, and the spatial extent of the geothermal field. The complex fault geometry leads to a high degree of variability in the locations experiencing stress states that promote fracture, but such locations generally correlate with the main injection and production wells at Desert Peak. In addition, the strongest and most common stress concentrations occur within relays between unconnected fault segments, and at bends and intersections in faults that connect overlapping fault segments associated with relays. The modeling approach in this study tests the conceptual model of the fault geometry at Desert Peak while honoring mechanical constants and available constraints on driving stresses and provides a framework that aids in geothermal exploration by predicting the spatial variations in stresses likely to cause and reactivate fractures necessary to sustain hydrothermal fluid flow. This approach also quantifies the relative sensitivity of such predictions to fault geometry, remote stress, and friction, and determines the best fitting model with its associated probability.
Temple University--Theses
Suer, Selin. "Monitoring Of Chemical And Isotopic Compositions Of Geothermal Waters Along The North Anatolian Fault Zone." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605369/index.pdf.
Full text#948
18O-&
#948
D-3H) of the geothermal waters along the North Anatolian Fault Zone (NAFZ) and highlight any possible seismicity-induced temporal variations during the course of two years (2002-2003) monitoring programme. The geothermal sites are alligned along a 800 km transect of the NAFZ and are, from west to east, Yalova, Efteni, Bolu, Mudurnu, Seben, KurSunlu, Hamamö
zü
, Gö
zlek and ReSadiye. The thermal waters of NAFZ are dominantly Na-HCO3, whereas the cold waters are dominantly Ca-HCO3 in character. The highest temperature (72.3&
#61616
C) is recorded in Seben. The hot waters are slightly acidic to alkaline in character with pH values ranging between 5.92-7.97, while the cold waters are comparatively more alkaline with pH values between 6.50-8.83. Both hot and the cold waters are meteoric in origin. The hot waters have lower &
#948
18O-&
#948
D and tritium values suggesting higher recharge altitudes for aquifers and longer residence times for waters, respectively, in the geothermal system (compared to the cold waters). Temporal variations are detected in both ionic and isotopic compositions of the cold and the hot waters, and these reflect seasonal variations for cold and seismicity-induced variations for hot waters. Although no major earthquakes (M>
5) occurred along the NAFZ during the monitoring period, temporal variations recorded in Cl and 3H, and to a lesser extent in Ca and SO4 contents seem to correlate with seismicity along the NAFZ. In this respect, Yalova field deserves the particular attention since seismicity induced variations were better recorded in this field.
Mitchell, Peter Ashley. "Geology, hydrothermal alteration and geochemistry of the Iamalele (D'Entrecasteaux Islands, Papua New Guinea) and Wairakei (North Island, New Zealand) geothermal areas." Thesis, University of Canterbury. Geology, 1989. http://hdl.handle.net/10092/5561.
Full textKessler, James Andrew. "In Situ Stress and Geology from the MH-2 Borehole, Mountain Home, Idaho: Implications for Geothermal Exploration from Fractures, Rock Properties, and Geomechanics." DigitalCommons@USU, 2014. https://digitalcommons.usu.edu/etd/3966.
Full textArfstrom, John David. "A model of the hydrothermal system at Casa Diablo in Long Valley, California, based on resistivity profiles and soil mercury analyses." FIU Digital Commons, 1993. http://digitalcommons.fiu.edu/etd/1306.
Full textGrimaldi, David Andres. "Dissolved Gases and a Carbon Dioxide Balance from the San Vicente Geothermal Fieldin El Salvador, Central America." Ohio University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1615276127141058.
Full textSullivan, Michael P. "Water Balance of the San Simon Groundwater Basin, El Salvador, Central America: Implications for the Berlin Geothermal Field." Ohio : Ohio University, 2008. http://www.ohiolink.edu/etd/view.cgi?ohiou1212673612.
Full textNukman, Mochamad [Verfasser], Wilhelm [Akademischer Betreuer] Dominik, and Inga [Akademischer Betreuer] Moeck. "Geothermal exploration involving structural geology and hydrochemistry in the Tarutung Basin, Northern Central Sumatra (Indonesia) / Mochamad Nukman. Gutachter: Inga Moeck. Betreuer: Wilhelm Dominik." Berlin : Technische Universität Berlin, 2014. http://d-nb.info/1065669704/34.
Full textGrigsby, Nathan. "Evaluating the effect of hyporheic exchange on intake temperatures of open-loop geothermal wells in glacigenic outwash aquifers." Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1341855556.
Full textJacquey, Antoine Baptiste [Verfasser], Magdalena [Akademischer Betreuer] Scheck-Wenderoth, and Jan Florian [Akademischer Betreuer] Wellmann. "Coupled thermo-hydro-mechanical processes in geothermal reservoirs: a multiphysic and multiscale approach linking geology and 3D numerical modelling / Antoine Baptiste Jacquey ; Magdalena Scheck-Wenderoth, Jan Florian Wellmann." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/1169657664/34.
Full textRichardson, Joshua J. "Thermal and Hydrological Study of Flooded Abandoned Coal Mines in Ohio as Potential Heat Exchangers." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1399479195.
Full textYoung, Nathan Lee. "Effect of Rivers on Groundwater Temperature in Heterogeneous Buried-Valley Aquifers: Extent, Attenuation, and Phase Lag of Seasonal Variation." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1401813367.
Full textMadera-Martorell, Andreana. "Potential Use of Abandoned Underground Coal Mine AS-029 as a Reservoir for Ground Source Heat Pumps, Athens, OH." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1597189919105252.
Full textAly, Husein, and Gur Singh. "Värmesystem." Thesis, KTH, Byggvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173954.
Full textThis rapport is about evaluating four different heating systems. These systems are first, each system is described, how it works and then pros and cons with each system. Choosing the right heating system is different for different buildings since they all have different conditions. In the discussion these four systems are compared to each other considering all these conditions. The Conditions examined can be found in the beginning of the report.
Rajeh, Tawfik. "Modeling flow in fractured geologic media : upscaling and application to deep geothermal reservoirs." Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0051.
Full textFractures constitute major pathways for flow and transport in fractured porous rocks. These types of rocks are encountered in a wide range of applications like for example gas and petroleum engineering, CO2 sequestration and geothermal energy extraction. The present thesis presents a framework to analyze geometrical, topological and hydraulic properties of 3D planar fracture networks with focus on upscaling these properties to obtain an equivalent continuum, in view of application to simulations of geothermal reservoir exploitation. The description of fractures and discrete fracture networks (DFN), their statistical properties and their generation procedures are studied. As permeability plays a key role in flow and transport in fractured porous rocks, we have developed a fast upscaling approach for determining the equivalent permeability tensor of 3D fractured porous media. This new approach is based on the superposition principle improved by empirical connectivity factors in order to take into account the connectivity and percolation properties of the fracture network. Although efficient in predicting permeability, the proposed method presents a major limitation due mainly to the difficulty in assessing the percolation and connectivity properties of the network. To overcome these limitations and for further insightful analyses of DFN composed of planar fractures, an original framework of geometrical and topological analysis of 3D fracture networks has been developed. In this framework, all the geometrical and topological attributes (intersections, areas, trace lengths, clusters, percolating clusters, etc.) of a DFN are explicitly calculated by a set of algorithms. These algorithms are validated in detail by comparison to commercial softwares, and their computational efficiency is highlighted. The final purpose of this framework is to give a graph representation of the DFN. Given the newly developed tools, our capabilities of treating fracture networks have drastically increased. Hence, using a graph representation of the DFN, new approaches have been developed concerning two main issues with fracture networks: (i) percolation, (ii) clustering phenomenon (i.e., the formation of clusters by groups of fractures) and (iii) permeability upscaling. A large scale thermo-hydraulic simulator has therefore been developed with the finite volume open source code “OpenFoam”. The purpose is to apply the upscaling techniques to large scale reservoir configurations with a full coupling with heat transfer. A typical example of injectionproduction wells in a 3D geothermal reservoir is presented, and other cases are being developed within the GEOTREF project ( www.geotref.com )
Miele, Roberto. "Thermal rock properties of geothermal reservoirs and caprocks in the Danish Basin – prerequisites for geothermal applications." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16250/.
Full textGriesser, Jean-Claude. "Geothermische Prospektion zwischen Baden und Schinznach : geophysikalische Untersuchungen und thermohydraulische Modellrechnungen /." Zürich : ETH, 1985. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=7845.
Full textKerry, Kristopher Edwin 1973. "An exploratory survey of the experimental determination of the activity of jadeite component in binary (jadeite-hedenbergite) pyroxene: Implications for geothermo-barometry of eclogites." Thesis, The University of Arizona, 1999. http://hdl.handle.net/10150/291827.
Full textWybo, Jean-Luc. "Expertgraph : analyse basée sur des connaissances et suivi temps réel d'information géographique évolutive : application à la prévention des incendies de forêt." Nice, 1991. http://www.theses.fr/1991NICE4504.
Full textIn the recent years, computer techniques have brought new tools for analysis and synthesis of cartographic documents, generally called GIC (graphical information system). Likewise, monitoring of industrial processes have been improved for real time response and user interface. The work presented in this thesis is intended to enhance graphical information management, allowing the study of evoluting situations. To reach this goal, we propose a software environment for applications development, built around a real time kernel in charge of monitoring. Originality of our approach consists in allowing : Automation of the different tasks needed for real time monitoring : receive evoluting data, analyse situation and present synthetic information for user ; to specify the behaviour of the real time kernel in a declarative way, on the basis of knowledge given by experts, whatever this knowledge describe : data processing, situation analysis, or graphical aspect of date ; to supply users with a graphical interface allowing them to dicern spatial and temporal evolution of the situation. First we present the context of the problem, then we propose an architecture for the environment and finally we present an application to forest fire prevention in the mediteranean area
Raguenel, Margaux. "Modélisation des phénomènes thermo-hydrauliques dans des réservoirs fracturés sur des maillages non structurés : application au réservoir géothermique de Basse-Terre, Guadeloupe." Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0338.
Full textThe quantification of natural geological resources (oil, gas, water, ore deposits, geothermal energy, etc) calls for a precise understanding and description of the geological heterogeneities and physical and chemical processes that influence their formation, their settings, their preservation and their recovery. In order to understand the physical behavior of subsurface reservoirs, 2D, 3D and 4D geological models must be developed as basis for numerical simulations. A numerical model needs the integration and homogenization of various and multi-scale data. This implies hypothesis, choices and simplifications to represent the complexity of geological objects and physical processes with a limited number of parameters. In the case of high temperature geothermal studies, one must face both the geometric and structural complexity of volcanic environments and the resolution of coupled physical processes. This calls for the use of several developments made in different research domains, with different tools. However, interoperability between all these theoretical and numerical tools remains a challenge. This work tackles this issue by preserving the geometrical complexity of geological models thanks to unstructured grids and tools which allows realistic physical simulations. New strategies are proposed to preserve the geological characteristics of the model, by honoring field data and the organization of geological structures during physical simulations. Several tools have been developed to identify and represent these structures that play a fundamental role in physical processes, such as layers, faults or model boundaries. An adapted numerical representation (allowed by the RINGMesh library which focuses on using geological concepts in the model description) preserves these elements from the geomodeler (SKUA-GocadTM) to the physical simulator (CSMP++). These tools are part of an integrated workflow, going from geological modeling to physical simulations, i.e. from geometrical characterization of the main geological structures to the quantification of reservoir resources. The developed methodologies are first benchmarked with analytical solutions and applied on synthetic cases. They have then been used in a case study to understand the evolution of thermo-hydraulic processes in the geothermal reservoir of Basse-Terre, Guadeloupe (in the frame of the GEOTREF project). A first study has been led in 2D to assess the physical realism of three possible geological scenarios designed in regard of the available field data, such as temperature profiles and MT survey. This study reproduces the observed temperature profiles in two of the studied scenarios and seems to exclude the hypothesis of strong lateral heat transfers at the island scale. A second study has then been realized in 3D, using a progressive model complexification approach to test the impact of heterogeneities on the global physical behavior of the reservoir. It appears that the thermal behavior of the designed model is mainly influenced by the topography of the area, rather than the introduction of permeable heterogeneities, such as fault corridors. However, impermeable features such as sliding surfaces have not been added and a major uncertainty about the heat source position, shape and size remains and could be further studied. These works have allowed (1) to build of a numerical environment that facilitates the tests regarding the impact of geological heterogeneities on the physical behavior of reservoirs, (2) to open the path toward a better understanding and characterization of the thermo-hydraulic behavior of a geothermal reservoir, and especially toward the quantification of the influence of the geometry and connectivity of heterogeneities on physical processes
Goy, Laurent. "Mesure et modélisation des températures dans les massifs rocheux : application au projet de tunnel profond Maurienne-Ambin." Phd thesis, Université Joseph Fourier (Grenoble), 1996. http://tel.archives-ouvertes.fr/tel-00642650.
Full textDurand, Philippe. "Traitement des donnees radar varan et estimation de qualites en geologie, geomorphologie et occupation des sols." Paris 7, 1988. http://www.theses.fr/1988PA077183.
Full textLecuyer, Christophe. "Hydrothermalisme fossile dans une paléocroûte océanique associée à un centre d'expansion lent : le complexe ophiolitique de Trinity (N. Californie, U.S.A.)." Rennes 1, 1989. https://tel.archives-ouvertes.fr/tel-00655957.
Full textLavedan, Gérard. "Aménagement hydroélectrique de Turkwel en bordure du rift - Kenya : contribution du génie géologique à la conception et aux travaux de l'aménagement souterrain." Grenoble 1, 1991. http://www.theses.fr/1991GRE10145.
Full textSunjoto. "La mesure de l'ouverture de filtration des géotextiles : analyse des méthodes d'essai." Grenoble 1, 1986. http://www.theses.fr/1986GRE10095.
Full textBouddour, Ahmed. "Contribution de l'homogénéisation à l'étude des transferts couplés de fluides, de chaleur et de particules en suspension en milieu poreux : application à l'étude de réservoirs géothermiques." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10140.
Full textHadj, Hassen Faouzi. "Modelisation par un milieu continu du comportement mecanique d'un massif rocheux a fissuration orientee." Paris, ENMP, 1988. http://www.theses.fr/1988ENMP0120.
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