Geothermics最新文献_第4页

Evaluation of geothermal resource potential based on spatial data integration models: case study of Xiong’an New Area, North China 基于空间数据集成模型的地热资源潜力评价——以雄安新区为例

IF 3.5 2区工程技术

Geothermics Pub Date : 2025-05-09 DOI: 10.1016/j.geothermics.2025.103376

Tingting Ke , Wei Xu , Ruyang Yu , Yang Zhou , Yage Zhang , Zhiqiang Zhao , Jianqiang Liu

{"title":"Evaluation of geothermal resource potential based on spatial data integration models: case study of Xiong’an New Area, North China","authors":"Tingting Ke , Wei Xu , Ruyang Yu , Yang Zhou , Yage Zhang , Zhiqiang Zhao , Jianqiang Liu","doi":"10.1016/j.geothermics.2025.103376","DOIUrl":"10.1016/j.geothermics.2025.103376","url":null,"abstract":"<div><div>As one of the most realistic and competitive renewable energy, geothermal resources are increasingly valued by governments and industries. Recognizing the favorable geothermal areas is conducive to reduce the economic risk of geothermal exploitation projects. This work is based on a case study from Xiong’an New Area, North China, which is rich in geothermal fluids in carbonate reservoirs. Three spatial data integration models are established to identify the geothermal favorable areas. The geothermal favorability map is developed based on five criteria layers generated from five evidence factors (bouguer gravity anomaly, magnetic anomaly, buried depth of carbonate reservoir, geothermal gradient and terrestrial heat flow). The performance of the model is evaluated by kappa coefficient analysis, success index analysis and receiver operating characteristic curve analysis. The results reveal that the Weighted Information Content Model is more effective and accurate. The extremely high favorable area and the high favorable area in Xiong’an New Area account for 6% and 8% of the total area, respectively. Moreover, the amount of thermal energy in geothermal favorable areas is determined by the unit volumetric method. The insights from this study provide a low-cost and efficient approach for evaluating the geothermal potential of regions lacking sufficient exploration data.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103376"},"PeriodicalIF":3.5,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Geospatial assessment of soil thermal conductivity for geothermal energy systems in Ecuador 厄瓜多尔地热能源系统土壤导热系数的地理空间评价

IF 3.5 2区工程技术

Geothermics Pub Date : 2025-05-09 DOI: 10.1016/j.geothermics.2025.103373

Jaime Duque , Marcelo Moya , Esteban Urresta , Kerby Harnisth

{"title":"Geospatial assessment of soil thermal conductivity for geothermal energy systems in Ecuador","authors":"Jaime Duque , Marcelo Moya , Esteban Urresta , Kerby Harnisth","doi":"10.1016/j.geothermics.2025.103373","DOIUrl":"10.1016/j.geothermics.2025.103373","url":null,"abstract":"<div><div>This study presents a detailed cartographic assessment of soil thermal conductivity in continental Ecuador using an adapted methodology based on the THERMOMAP project and Kersten's (1949) model. Soil thermal conductivity is essential for geothermal energy applications, particularly for designing efficient ground-source heat pump (GSHP) systems. Accurate mapping requires an analysis of soil texture, bulk density, and moisture content, applying mathematical correlations to estimate conductivity across different depths and regions. Climatic parameters (temperature and precipitation data from 2013–2022) and pedological data (soil texture and density) were processed through Geographic Information System (GIS) tools to create a thermal conductivity map. Results revealed soil thermal conductivity values ranging from 0.87 W/mK to 2.30 W/mK, with 95.34% of the surveyed area exhibiting values above 1.0 W/mK. Conductivity distribution was primarily within the ranges of 1.00–1.25 W/mK (54.36%) and 1.50–1.75 W/mK (33.48%). The Andean region demonstrated the highest geothermal potential, with 70.35% of its soils exceeding 1.25 W/mK, whereas coastal and eastern regions had lower proportions (37.99% and 28.10%, respectively). These findings align with previous research, highlighting significant variability driven by soil composition, moisture dynamics, and geological formations. The resulting map is valuable for identifying sites where knowledge of shallow soil thermal properties (less than 1 meter depth) is crucial for closed-loop geothermal system design. It supports optimal location selection for geothermal heat pumps, contributing to reliable heating and cooling in urban and rural areas, promoting sustainable energy diversification, and enhancing environmental sustainability in Ecuador.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103373"},"PeriodicalIF":3.5,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of magma chamber on the formation of high-temperature geothermal resource in volcanic geothermal systems: A case study of the Changbai mountain region 火山地热系统中岩浆房对高温地热资源形成的影响——以长白山地区为例

IF 3.5 2区工程技术

Geothermics Pub Date : 2025-05-08 DOI: 10.1016/j.geothermics.2025.103375

Jialin Song , Nansheng Qiu , Qianqian Feng , Chuanqing Zhu , Yonghui Huang , Keyan Liao , Zhanwen Zhang , Yike Zhou

{"title":"Influence of magma chamber on the formation of high-temperature geothermal resource in volcanic geothermal systems: A case study of the Changbai mountain region","authors":"Jialin Song , Nansheng Qiu , Qianqian Feng , Chuanqing Zhu , Yonghui Huang , Keyan Liao , Zhanwen Zhang , Yike Zhou","doi":"10.1016/j.geothermics.2025.103375","DOIUrl":"10.1016/j.geothermics.2025.103375","url":null,"abstract":"<div><div>Magma chambers significantly influence geothermal temperature distribution, particularly in forming high-temperature (>150 °C) geothermal resources. This study investigates the role of magma chambers in controlling geothermal temperature distribution, with a focus on the Changbai Mountain volcanic geothermal system, located within the Circum-Pacific Geothermal Belt. Despite extensive surface manifestations of medium-low temperature hot springs, the region lacks high-temperature geothermal features. By integrating drilling data, geophysical surveys, and geochemical analyses, a three-dimensional geological model was constructed, revealing an elliptical magma chamber (30 km east-west, 70 km north-south) as a significant heat source which influences an area of ∼11,780 km², The surface heat flow value of Changbai Mountain region ranging from 70.1 to 130.8 mW/m² (average 83.8 mW/m²), of which ∼10.3 mW/m² is directly attributable to the magma chamber. The 150°C isotherm burial depth ranges from 2.35 to 4.43 km, with the shallowest depths distributed in the chamber’s thermal influence zone. The geothermal resource potential of the 2-4 km carbonate reservoir is estimated at ∼5.79 × 10<sup>20</sup> J, corresponding to a power generation potential of ∼6759.4 MWe, with an additional ∼262.4 MWe contributed by the magma chamber. This study provides a reliable model and case reference for geothermal resource assessment in volcanic geothermal systems, offering quantitative data to support the exploitation of high-temperature geothermal resources in magma chamber-associated volcanic systems.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103375"},"PeriodicalIF":3.5,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143918462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The genesis of typical geothermal water in Shigatse based on hydrochemical characteristics and isotopes 从水化学特征和同位素分析日喀则地区典型地热水成因

IF 3.5 2区工程技术

Geothermics Pub Date : 2025-05-06 DOI: 10.1016/j.geothermics.2025.103374

Yadong Zheng , DaWa Nan , Zhao Liu , Ciren Pubu , Mengmeng Zhu , Haihua Zhao , Yifei Xing , Sihang Han , Qifeng Zeng , Linjie Zhang

{"title":"The genesis of typical geothermal water in Shigatse based on hydrochemical characteristics and isotopes","authors":"Yadong Zheng , DaWa Nan , Zhao Liu , Ciren Pubu , Mengmeng Zhu , Haihua Zhao , Yifei Xing , Sihang Han , Qifeng Zeng , Linjie Zhang","doi":"10.1016/j.geothermics.2025.103374","DOIUrl":"10.1016/j.geothermics.2025.103374","url":null,"abstract":"<div><div>Shigatse City, located in the tectonically active Qinghai-Tibet Plateau, possesses abundant geothermal resources with complex formation mechanisms. This study systematically examines the characteristics of water-rock interactions within the geothermal system using an integrated approach that combines hydrogeochemical analysis and multiple isotope tracers. The key findings are as follows: (1) The geothermal system is classified as a thermal convection type within tectonic uplift zones. Geothermal water undergoes extensive water-rock interactions during migration, exhibiting deep circulation characteristics; (2) Hydrochemical analysis identifies the geothermal water was predominantly HCO<sub>3</sub>-Na type, with notably high Na<sup>+</sup> and TDS concentrations compared to typical geothermal fluids. Sulfur isotope analysis indicates that sulfate mineral dissolution is the primary sulfur source; (3) Geothermometric calculations estimate reservoir temperatures between 118 and 275°C, while mixing model analysis suggests that shallow cold water contributes 67−88% of the geothermal water composition; (4) Stable isotope studies reveal that the primary recharge sources are high-altitude snowmelt water and atmospheric precipitation, with recharge elevations ranging from 2541 to 5971 m. Strontium isotope analysis further establishes a genetic relationship between geothermal water and regional marine sedimentary formations. This study innovatively introduces a \"deep water-rock interaction-shallow mixing\" genetic model and develops a comprehensive conceptual model of the geothermal system. The findings enhance understanding of geothermal formation mechanisms in tectonically active plateau regions and provide a theoretical foundation for exploration, development, and sustainable utilization of geothermal resources.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103374"},"PeriodicalIF":3.5,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143911849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Terrestrial heat flow and lithospheric thermal structure of Gaoyang low uplift in Jizhong depression, North China 冀中坳陷高阳低隆起带大地热流与岩石圈热结构

IF 3.5 2区工程技术

Geothermics Pub Date : 2025-05-05 DOI: 10.1016/j.geothermics.2025.103352

Feng Liu , Wei Zhang , Feng Chen , Chen Yue , Linxiao Xing , Long Li

{"title":"Terrestrial heat flow and lithospheric thermal structure of Gaoyang low uplift in Jizhong depression, North China","authors":"Feng Liu , Wei Zhang , Feng Chen , Chen Yue , Linxiao Xing , Long Li","doi":"10.1016/j.geothermics.2025.103352","DOIUrl":"10.1016/j.geothermics.2025.103352","url":null,"abstract":"<div><div>Gaoyang Low Uplift, situated in Jizhong Depression's central region, is a key geothermal zone in the North China Plain yet remains under-researched regarding its geothermal characteristics. This study selects it as a model area, probing into the ground heat flow and lithospheric thermal structure of its southern and northern parts via geothermal logging and rock-sample tests. By integrating regional tectonic evolution and stratigraphic and structural distribution, the study highlights the significance of various parameters in understanding the lithospheric thermal structure for geothermal resource development in the area. The advantageous geothermal conditions in the northern region stem from several factors: higher mantle heat flow and higher deep temperatures, a thinner lithosphere, shallowly buried carbonate geothermal reservoirs, and extensive extensional water-conducting faults within the Cenozoic strata. Here, mantle heat flow is the key driver of geothermal resources formation. By influencing the strength of geological activity, it in turn affects the other factors.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103352"},"PeriodicalIF":3.5,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143906505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unlocking geothermal potential: Activating calcite-filled veins using chelating agents to improve granitic rock permeability 释放地热潜力：利用螯合剂激活方解石充填的矿脉，提高花岗岩的渗透性

IF 3.5 2区工程技术

Geothermics Pub Date : 2025-05-05 DOI: 10.1016/j.geothermics.2025.103356

Lena Muhl , Luis Salalá , Eko Pramudyo , Jiajie Wang , Ingo Sass , Noriaki Watanabe

{"title":"Unlocking geothermal potential: Activating calcite-filled veins using chelating agents to improve granitic rock permeability","authors":"Lena Muhl , Luis Salalá , Eko Pramudyo , Jiajie Wang , Ingo Sass , Noriaki Watanabe","doi":"10.1016/j.geothermics.2025.103356","DOIUrl":"10.1016/j.geothermics.2025.103356","url":null,"abstract":"<div><div>Chemical stimulation of geothermal reservoirs using environmentally friendly chelating agents has emerged as a promising method to complement hydraulic stimulation. While hydraulic techniques have been the primary approach for enhancing permeability, numerous basement rock types worldwide contain infilled veins with calcium-bearing minerals (e.g., calcite) that present a significant opportunity for achieving higher permeability improvements through chemical methods. In this study, flooding experiments were performed on fractured granitic rocks with calcite-filled veins at 200 °C using a 20 wt.% <em>N,N</em>-bis(carboxymethyl)-<em><span>L</span></em>-glutamic acid (GLDA) solution at a pH of 4. The GLDA solution selectively dissolved calcite, reactivating mineral-filled veins, which provided superior fluid-flow pathways compared to the initial artificial fractures. Reactivated veins resulted in dramatic permeability enhancements, reaching up to three orders of magnitude within two hours of stimulation. These results demonstrate the feasibility and effectiveness of chelating agents-assisted chemical stimulation by activating calcite-filling veins.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103356"},"PeriodicalIF":3.5,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143906506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Geophysical characterization of the Cerro Machin geothermal area using three dimensional seismic and resistivity models 利用三维地震和电阻率模型对Cerro Machin地热区进行地球物理表征

IF 3.5 2区工程技术

Geothermics Pub Date : 2025-05-03 DOI: 10.1016/j.geothermics.2025.103370

Juan Herrera , Marco Calò

{"title":"Geophysical characterization of the Cerro Machin geothermal area using three dimensional seismic and resistivity models","authors":"Juan Herrera , Marco Calò","doi":"10.1016/j.geothermics.2025.103370","DOIUrl":"10.1016/j.geothermics.2025.103370","url":null,"abstract":"<div><div>The volcanic complex of Cerro Machín is located on the eastern flank of Colombia’s Cordillera Central. It exhibits complex geological and geothermal features indicative of a significant subsurface geothermal reservoir. This study proposes the first joint interpretation of passive 3D seismic tomography and magnetotelluric resistivity modeling to characterize the geothermal potential of the Cerro Machín area. Seismic data recorded from 1998 to 2019 are used to generate P wave velocity and Vp/Vs ratio models down to 8 km below sea, level (b.s.l.), Additionally, statistical analysis of the seismicity is used to refine the data interpretation. Magnetotelluric data acquired in 2019, are used to generate a high-resolution resistivity model to depths of 5.1 km. The results are then combined to propose an integral model where a high resistivity sealing cup is topping a vertically elongated low Vp, low Vp/Vs and low resistivity body beneath the Cerro Machín Volcano. These bodies reach depths of ∼2 km b.s.l., providing useful information about the lateral and vertical extension of a potential geothermal reservoir. Additionally, a high Vp body identified at 2–3 km b.s.l. is compatible with the expression of a magmatic heat source that possibly is feeding the system. The distribution of seismic clusters, b-values, and resistivity patterns further delineates fluid pathways, likely controlled by fault zones or the volcanic domes conduits. These findings provide key insights on the structure of an ongoing state of the Cerro Machin volcanic complex that can be used for future exploration and support for the Colombia’s geothermal energy initiatives.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103370"},"PeriodicalIF":3.5,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143900243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Heat flux evaluation based on active fiber optic distributed temperature sensing tests in southwestern Yukon, Canada 基于加拿大育空地区西南部有源光纤分布式温度传感试验的热通量评估

IF 3.5 2区工程技术

Geothermics Pub Date : 2025-05-03 DOI: 10.1016/j.geothermics.2025.103354

Fiona Margaret Chapman , Maria Klepikova , Olivier Bour , Mafalda Miranda , Renaud Soucy La Roche , Jasmin Raymond

{"title":"Heat flux evaluation based on active fiber optic distributed temperature sensing tests in southwestern Yukon, Canada","authors":"Fiona Margaret Chapman , Maria Klepikova , Olivier Bour , Mafalda Miranda , Renaud Soucy La Roche , Jasmin Raymond","doi":"10.1016/j.geothermics.2025.103354","DOIUrl":"10.1016/j.geothermics.2025.103354","url":null,"abstract":"<div><div>Geothermal energy could decrease remote regions dependence on diesel by offering an alternative baseload energy. However, the geothermal exploration risk is high in remote regions due to limited temperature and ground thermal conductivity data, and resultant heat flux evaluations. Thermal response tests are commonly used in the heat pump industry to evaluate the effective thermal conductivity, but these tests are typically performed in shallow wells (< 200 m), assume the effective thermal conductivity to be purely due to conduction and neglect the influence of groundwater flow. Herein, fibre-optic distributed temperature sensing was used during active thermal response tests to produce a high-resolution in-situ effective thermal conductivity profile. The high-resolution profiles allow conduction-dominated segments to be isolated based on the temperature and effective thermal conductivity profiles. This method was applied to two boreholes in southwestern Yukon on the traditional territory of Kluane First Nation (KFN-L: 387 m and DRGW: 220 m). The heat flux was evaluated based on conductive segments of the temperature and thermal conductivity profiles. The temperature profile was corrected for topography and paleoclimate effects, and the internal heat generation was also considered. This resulted in heat flux estimation of 89 mW m<sup>-2</sup> and 99 mWm<sup>-2</sup> at KFN-L and DRGW, respectively. These values decrease exploration uncertainty around Burwash Landing, Yukon, where data scarcity is a challenge to geothermal exploration. This method could be applied in diverse geological settings to confidently estimate local terrestrial heat flux in pre-existing boreholes.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103354"},"PeriodicalIF":3.5,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143902196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization and behavior result analysis of a solar assisted ground source heat pump system using TRNSYS simulation tool 利用TRNSYS仿真工具对太阳能辅助地源热泵系统进行优化及性能分析

IF 3.5 2区工程技术

Geothermics Pub Date : 2025-05-01 DOI: 10.1016/j.geothermics.2025.103353

Nabiha Naili, Omeima Nouicer, Issam Attar, Ghofrane Mgadmi

{"title":"Optimization and behavior result analysis of a solar assisted ground source heat pump system using TRNSYS simulation tool","authors":"Nabiha Naili, Omeima Nouicer, Issam Attar, Ghofrane Mgadmi","doi":"10.1016/j.geothermics.2025.103353","DOIUrl":"10.1016/j.geothermics.2025.103353","url":null,"abstract":"<div><div>In this paper, a mathematical model, developed using TRNSYS software and validated against experimental data, is employed to conduct a multi-objective design optimization for a solar-assisted ground source heat pump (SAGSHP) system. The SAGSHP system consists of a vertical borehole U-tube ground heat exchanger (GHE) and an integrated solar flat-plate collectors (SFC), which are used to meet the space heating needs of a typical household in the climatic conditions of Northern Tunisia. The average coefficient of performance of the geothermal heat pump (COP<sub>HP</sub>) is used as an evaluation parameter to optimize the sub-systems of the SAGSHP: the U-tube GHE, the heat pump (GHP), the SFC, and the radiant floor heating system (RFH). The optimization process determines the number of U-tube GHEs, their depth, the mass flow rate of the circulating fluid in each U-tube, the pipe spacing of the RFH, the mass flow rate in the RFH, and the surface area of the SFC as well as the fluid mass flow rate circulating in the collectors. The optimized solution is then used in a case study to assess the feasibility of using the SAGSHP system for space heating in a household with an area of 145 m² and a heating load of 12 kW.</div><div>Simulation results show that the energy recovered from the ground via U-tube GHE is 80 kW, the heat pump delivered energy is 95 kW, the SFC contributes by 27 % of the required heating energy during sunny period and the geothermal heat pump’s coefficient of performance is 4,45.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103353"},"PeriodicalIF":3.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental investigation of shear in granite fractures at Utah FORGE: Implications for EGS reservoir stimulation 犹他州福奇花岗岩裂缝剪切实验研究：对EGS油藏增产的启示

IF 3.5 2区工程技术

Geothermics Pub Date : 2025-05-01 DOI: 10.1016/j.geothermics.2025.103344

U.C. Iyare , L.P. Frash , B. K C , M. Meng , W. Li , Y. Madenova , S.K. Peterson , M.R. Gross , M.M. Smith , K.A. Kroll

{"title":"Experimental investigation of shear in granite fractures at Utah FORGE: Implications for EGS reservoir stimulation","authors":"U.C. Iyare , L.P. Frash , B. K C , M. Meng , W. Li , Y. Madenova , S.K. Peterson , M.R. Gross , M.M. Smith , K.A. Kroll","doi":"10.1016/j.geothermics.2025.103344","DOIUrl":"10.1016/j.geothermics.2025.103344","url":null,"abstract":"<div><div>Efficient heat transfer from hot dry rock to a working fluid requires the large surface area provided by fractures. These fractures are likely to include both tensile hydraulic fractures and natural shear fractures and faults. Maintaining flow through these fractures is vital for the performance of Enhanced Geothermal Systems (EGS). Among numerous prior studies, there remains a lack of laboratory measurements to quantify shear fracture evolution in the coupled thermal, hydraulic, mechanical, and chemical (THMC) environment of a geothermal reservoir. To address this, we conducted triaxial direct-shear tests on crystalline, granitic rock samples from the Utah Frontier Observatory for Research in Geothermal Energy (Utah-FORGE) site in Milford, Utah. We measured fracture permeability, aperture, strength, deformation, and effluent chemistry before and after shear slip under in-situ conditions at the Utah-FORGE site – replicating stress, pressure, temperature, minerology, and injectate water chemistry. Our results show that shear displacement can increase fracture permeability by up to an order of magnitude (factor of ∼10); however, in some cases, permeability decreased by up to two orders of magnitude (factor of ∼0.01), due to gouge formation, chemical alteration, stress cycling, and changes in surface roughness. Our tests also indicate in-situ shear is likely to produce smooth-planar shear surfaces (e.g., dilation angles <7°), akin to slickensides, which reduces the benefit of shear fracture stimulation. Effluent analysis confirms rapid silicate and halite mineral dissolution and magnesium precipitation on FORGE samples, especially after shear stimulation. Our work provides key new measurements for modelling Utah-FORGE and similar granitic geothermal prospects.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103344"},"PeriodicalIF":3.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143895159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0