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Geochemical and isotopic constraints on thermal waters around the Gulf of Edremit, western Türkiye
IF 3.5 2区 工程技术 Q3 ENERGY & FUELS Pub Date : 2025-01-17 DOI: 10.1016/j.geothermics.2025.103257
Hafize Akıllı , Önder Kayadibi , Halim Mutlu , Şule Gürboğa , Macit Karadağlar , Serap Arıkan , Sevilay Tan
The Edremit pull-apart basin located on the southern branch of the North Anatolian Fault System hosts the Güre, Edremit, and Ayvalık geothermal areas. The graben faults that form the basin are regions of high hydraulic conductivity and contribute to the deep circulation of thermal water. In this study, the chemical and isotopic characteristics of thermal and cold waters in these fields are investigated by using the major ion and trace element contents as well as environmental isotope compositions. The Güre and Edremit thermal waters are of Na-SO4 and Na-SO4-HCO3 type and Ayvalık thermal waters are represented by Na-HCO3 composition. One of the thermal waters in the Ayvalık field is likely to experience seawater intrusion. The diversity in the chemical composition and temperature of the studied thermal waters is explained by a combination of processes including mixing of the thermal water with cold groundwater, feldspar dissolution and ion exchange in clayey rocks. Results of environmental isotope analyses indicate that the Ayvalık waters have a shallower circulation and are recharged from elevations lower than Edremit and Güre waters. The Karakaya formation and volcanic rocks comprise the recharge area of Ayvalık waters whereas Kazdağ group rocks and granites are the major lithologies exposing on the recharge area of Güre and Edremit fields. Since quartz geothermometers yield temperatures less than 190 °C, silica concentration in waters is controlled by the chalcedony phase. Reservoir temperatures estimated by the chalcedony geothermometer are 79–96 °C for Güre waters, 64–73 °C for the Edremit waters and 48–54 °C for the Ayvalık waters. Cation geothermometers yield temperatures that are significantly higher than the silica geothermometers, 65–126 °C, 65–117 °C and 38–99 °C for the respective fields. Mineral equilibrium calculations indicate that all waters show undersaturation with respect to sulfate minerals (anhydrite and gypsum) and chalcedony.
{"title":"Geochemical and isotopic constraints on thermal waters around the Gulf of Edremit, western Türkiye","authors":"Hafize Akıllı ,&nbsp;Önder Kayadibi ,&nbsp;Halim Mutlu ,&nbsp;Şule Gürboğa ,&nbsp;Macit Karadağlar ,&nbsp;Serap Arıkan ,&nbsp;Sevilay Tan","doi":"10.1016/j.geothermics.2025.103257","DOIUrl":"10.1016/j.geothermics.2025.103257","url":null,"abstract":"<div><div>The Edremit pull-apart basin located on the southern branch of the North Anatolian Fault System hosts the Güre, Edremit, and Ayvalık geothermal areas. The graben faults that form the basin are regions of high hydraulic conductivity and contribute to the deep circulation of thermal water. In this study, the chemical and isotopic characteristics of thermal and cold waters in these fields are investigated by using the major ion and trace element contents as well as environmental isotope compositions. The Güre and Edremit thermal waters are of Na-SO<sub>4</sub> and Na-SO<sub>4</sub>-HCO<sub>3</sub> type and Ayvalık thermal waters are represented by Na-HCO<sub>3</sub> composition. One of the thermal waters in the Ayvalık field is likely to experience seawater intrusion. The diversity in the chemical composition and temperature of the studied thermal waters is explained by a combination of processes including mixing of the thermal water with cold groundwater, feldspar dissolution and ion exchange in clayey rocks. Results of environmental isotope analyses indicate that the Ayvalık waters have a shallower circulation and are recharged from elevations lower than Edremit and Güre waters. The Karakaya formation and volcanic rocks comprise the recharge area of Ayvalık waters whereas Kazdağ group rocks and granites are the major lithologies exposing on the recharge area of Güre and Edremit fields. Since quartz geothermometers yield temperatures less than 190 °C, silica concentration in waters is controlled by the chalcedony phase. Reservoir temperatures estimated by the chalcedony geothermometer are 79–96 °C for Güre waters, 64–73 °C for the Edremit waters and 48–54 °C for the Ayvalık waters. Cation geothermometers yield temperatures that are significantly higher than the silica geothermometers, 65–126 °C, 65–117 °C and 38–99 °C for the respective fields. Mineral equilibrium calculations indicate that all waters show undersaturation with respect to sulfate minerals (anhydrite and gypsum) and chalcedony.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"127 ","pages":"Article 103257"},"PeriodicalIF":3.5,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143148667","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
Geothermal reservoir temperature prediction using hydrogeochemical data of Northern Morocco: A machine learning approach
IF 3.5 2区 工程技术 Q3 ENERGY & FUELS Pub Date : 2025-01-17 DOI: 10.1016/j.geothermics.2025.103259
Fatima Zahra Haffou , Lalla Amina Ouzzaouit , Abdelmounim Qarbous , Larbi Boudad
Geothermal energy exploration depends on accurate estimation of reservoir temperatures. However, conventional methods are complex, costly and uncertain, especially those based on indirect measurements and assumptions. A dataset of 99 sets of hydrogeochemical and reservoir temperature data was created and five machine learning (ML) algorithms including decision tree regression (DTR), extreme gradient boosting (XGBoost), extremely randomised trees (XRT), natural gradient boosting (NGB) and deep neural network (DNN) were applied to address the issue. The models' predictive accuracy and generalisation potential in northern Morocco were evaluated by essential performance metrics including mean absolute error (MAE), root mean square error (RMSE) and coefficient of determination (R²). The XGBoost model proved superior with the highest R² of 0.9967 and the lowest MAE and RMSE of 0.7046 and 0.9992 respectively. Further, this study utilises Shapley additive explanation (SHAP) as an explainable technique to evaluate XGBoost predictive decisions. SHAP interpreted that SiO2 is the most important variable in predicting reservoir temperature. This study highlights the potential of ML for accurate reservoir temperature prediction, offering a reliable tool for model selection and advancing understanding of geothermal resources.
{"title":"Geothermal reservoir temperature prediction using hydrogeochemical data of Northern Morocco: A machine learning approach","authors":"Fatima Zahra Haffou ,&nbsp;Lalla Amina Ouzzaouit ,&nbsp;Abdelmounim Qarbous ,&nbsp;Larbi Boudad","doi":"10.1016/j.geothermics.2025.103259","DOIUrl":"10.1016/j.geothermics.2025.103259","url":null,"abstract":"<div><div>Geothermal energy exploration depends on accurate estimation of reservoir temperatures. However, conventional methods are complex, costly and uncertain, especially those based on indirect measurements and assumptions. A dataset of 99 sets of hydrogeochemical and reservoir temperature data was created and five machine learning (ML) algorithms including decision tree regression (DTR), extreme gradient boosting (XGBoost), extremely randomised trees (XRT), natural gradient boosting (NGB) and deep neural network (DNN) were applied to address the issue. The models' predictive accuracy and generalisation potential in northern Morocco were evaluated by essential performance metrics including mean absolute error (MAE), root mean square error (RMSE) and coefficient of determination (R²). The XGBoost model proved superior with the highest R² of 0.9967 and the lowest MAE and RMSE of 0.7046 and 0.9992 respectively. Further, this study utilises Shapley additive explanation (SHAP) as an explainable technique to evaluate XGBoost predictive decisions. SHAP interpreted that <span><math><mrow><mtext>Si</mtext><msub><mi>O</mi><mn>2</mn></msub></mrow></math></span> is the most important variable in predicting reservoir temperature. This study highlights the potential of ML for accurate reservoir temperature prediction, offering a reliable tool for model selection and advancing understanding of geothermal resources.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"127 ","pages":"Article 103259"},"PeriodicalIF":3.5,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143148666","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
Contemporary crustal stress in the Guangdong-Hong Kong-Macao Greater Bay Area, SE China: Implications for geothermal resource exploration and seismic hazard assessment
IF 3.5 2区 工程技术 Q3 ENERGY & FUELS Pub Date : 2025-01-15 DOI: 10.1016/j.geothermics.2025.103253
Xianrui Li , Shaopeng Huang , Tobias Hergert , Andreas Henk , Danhua Xin
Geothermal resources and seismic activity are two related earth science frontiers that are of great significance to socioeconomic development. The Guangdong-Hong Kong-Macao Greater Bay Area (GBA) in southeastern China is a geothermal resource-rich and seismically active region. Crustal stress information is crucial for identifying prospective hidden geothermal fields and assessing seismic hazards. However, the characteristics of crustal stress in the GBA region remain unclear. In this study, we construct a high-resolution three-dimensional (3D) geomechanical model of the GBA region with complex fault geometries and obtain the 3D stress state. The results show that the GBA region is subject to a laterally variable crustal stress field. The maximum horizontal stress (SH) is oriented predominantly NW-SE in the east of the study area and rotates to nearly N-S in the west. The shallow crust is dominated by a transpressional stress regime, while the deeper part exhibits transtension. Detailed stress analyses on typical individual faults show that the NW-trending faults commonly have low normal stresses and high dilation tendencies, thus favoring geothermal fluid circulation. In contrast, the ENE-/NE-trending faults, at high angles to the SH orientation, tend to act as barriers to fluid flow in the shallow crust and accumulate high strain energy, making them conducive to the generation of strong earthquakes. We propose a comprehensive conceptual model to illustrate the genetic mechanism of geothermal resources and strong earthquakes. This study is intended to promote the exploration of geothermal resources and support the seismic hazard assessment in the GBA region.
{"title":"Contemporary crustal stress in the Guangdong-Hong Kong-Macao Greater Bay Area, SE China: Implications for geothermal resource exploration and seismic hazard assessment","authors":"Xianrui Li ,&nbsp;Shaopeng Huang ,&nbsp;Tobias Hergert ,&nbsp;Andreas Henk ,&nbsp;Danhua Xin","doi":"10.1016/j.geothermics.2025.103253","DOIUrl":"10.1016/j.geothermics.2025.103253","url":null,"abstract":"<div><div>Geothermal resources and seismic activity are two related earth science frontiers that are of great significance to socioeconomic development. The Guangdong-Hong Kong-Macao Greater Bay Area (GBA) in southeastern China is a geothermal resource-rich and seismically active region. Crustal stress information is crucial for identifying prospective hidden geothermal fields and assessing seismic hazards. However, the characteristics of crustal stress in the GBA region remain unclear. In this study, we construct a high-resolution three-dimensional (3D) geomechanical model of the GBA region with complex fault geometries and obtain the 3D stress state. The results show that the GBA region is subject to a laterally variable crustal stress field. The maximum horizontal stress (S<sub>H</sub>) is oriented predominantly NW-SE in the east of the study area and rotates to nearly N-S in the west. The shallow crust is dominated by a transpressional stress regime, while the deeper part exhibits transtension. Detailed stress analyses on typical individual faults show that the NW-trending faults commonly have low normal stresses and high dilation tendencies, thus favoring geothermal fluid circulation. In contrast, the ENE-/NE-trending faults, at high angles to the S<sub>H</sub> orientation, tend to act as barriers to fluid flow in the shallow crust and accumulate high strain energy, making them conducive to the generation of strong earthquakes. We propose a comprehensive conceptual model to illustrate the genetic mechanism of geothermal resources and strong earthquakes. This study is intended to promote the exploration of geothermal resources and support the seismic hazard assessment in the GBA region.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"127 ","pages":"Article 103253"},"PeriodicalIF":3.5,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143148660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
New guidelines for the application of the infinite line source method for thermal response tests on atypical borehole heat exchanger configurations
IF 3.5 2区 工程技术 Q3 ENERGY & FUELS Pub Date : 2025-01-11 DOI: 10.1016/j.geothermics.2025.103251
C. Millar, M.F. Lightstone, J.S. Cotton
This study explores the application of the infinite line source when used to evaluate the temperature response of a thermal response test on a series of boreholes. This can occur in practical applications in which existing borehole fields need recharacterization when: field operation has persisted over multiple years, field modifications have been made, or enhanced understanding of the thermal properties are required for control strategies. In this study new insights towards the start time and duration of the thermal response test indicate that at a minimum duration of 75 h, the data for evaluation should begin after the first 50 h. The effect of horizontal piping connected to a borehole is also evaluated and characterised with respect to the effective length of the borehole heat exchanger. Next, thermal response tests performed on boreholes connected in series are evaluated and it was found that for a Fourier number less than 0.06 the infinite line source is applicable. Finally, the results from the case study are then applied to the model of experimental TRTs performed on boreholes in series with horizontal header pipes. The model uses the experimental inlet mass flow rate and temperature to investigate the heat transfer and thermal interaction between the individual boreholes to capture the outlet temperature. Thermal interaction along the depth of the boreholes are shown to have the majority of the impact on the ILS output. The ILS is able to estimate the thermal conductivity within 5% of the input value for these unique borehole arrangements.
{"title":"New guidelines for the application of the infinite line source method for thermal response tests on atypical borehole heat exchanger configurations","authors":"C. Millar,&nbsp;M.F. Lightstone,&nbsp;J.S. Cotton","doi":"10.1016/j.geothermics.2025.103251","DOIUrl":"10.1016/j.geothermics.2025.103251","url":null,"abstract":"<div><div>This study explores the application of the infinite line source when used to evaluate the temperature response of a thermal response test on a series of boreholes. This can occur in practical applications in which existing borehole fields need recharacterization when: field operation has persisted over multiple years, field modifications have been made, or enhanced understanding of the thermal properties are required for control strategies. In this study new insights towards the start time and duration of the thermal response test indicate that at a minimum duration of 75 h, the data for evaluation should begin after the first 50 h. The effect of horizontal piping connected to a borehole is also evaluated and characterised with respect to the effective length of the borehole heat exchanger. Next, thermal response tests performed on boreholes connected in series are evaluated and it was found that for a Fourier number less than 0.06 the infinite line source is applicable. Finally, the results from the case study are then applied to the model of experimental TRTs performed on boreholes in series with horizontal header pipes. The model uses the experimental inlet mass flow rate and temperature to investigate the heat transfer and thermal interaction between the individual boreholes to capture the outlet temperature. Thermal interaction along the depth of the boreholes are shown to have the majority of the impact on the ILS output. The ILS is able to estimate the thermal conductivity within 5% of the input value for these unique borehole arrangements.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"127 ","pages":"Article 103251"},"PeriodicalIF":3.5,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143148665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of geothermal resources in the northeast margin of the Pamir plateau
IF 3.5 2区 工程技术 Q3 ENERGY & FUELS Pub Date : 2025-01-10 DOI: 10.1016/j.geothermics.2025.103254
Feng Chen , Jingyu Lin , Genyi He , Shuai Wang , Xuelian Huang , Boyuan Zhao , Sijia Wang , Yongjie Han , Shihua Qi
The northeastern margin of the Pamir Plateau in China is situated in the northwestern Tibetan Plateau, proximity to the Indo-Asian subduction zone. The region is characterized by intense tectonic activity, high terrestrial heat and abundant groundwater, contributing to the formation of an extremely promising high-temperature geothermal system. By integrating various data sources, including water chemistry, isotopes, volatile gases, and radiogenic element analysis, with regional structural and geological data, a local geothermal genetic model is proposed. The snowmelt water and atmospheric precipitation infiltrated along the deep fault are mixed with the deep magmatic water, and heated by the magma, granite radioactive elements, fracture friction and a small amount of mantle heat flow to form the deep parent material thermal fluid (370 °C). The parent material thermal fluid continues to expand and rise, dissolves the surrounding rock minerals, and forms multiple shallow and deep thermal reservoirs (111.68 °C-260.96 °C). The fluid in the geothermal reservoir rises again under the driving of pressure difference, and forms Group A high temperature hot water after adiabatic cooling. As the hot water migrates upward and laterally flows into the secondary fault, mixed cooling and conduction cooling occur, resulting in the formation of Group B and C medium and low temperature water. In the study area, medium and low temperature hot water of Groups B and C are formed. Due to the different degree of mixed cold water, Group C hot water shows relatively higher content of Ca2+ and HCO3- ions and lower outcrop temperature compared with Group B. The recharge height of the geothermal water is inferred to be 3810–5540 m, and the recharge sources are mainly snowmelt water and atmospheric precipitation. These findings suggest a multi-faceted heat source regime, encompassing crustal radioactive heat generation, molten magma heat, tectonic frictional heat, and mantle heat flow.
{"title":"Analysis of geothermal resources in the northeast margin of the Pamir plateau","authors":"Feng Chen ,&nbsp;Jingyu Lin ,&nbsp;Genyi He ,&nbsp;Shuai Wang ,&nbsp;Xuelian Huang ,&nbsp;Boyuan Zhao ,&nbsp;Sijia Wang ,&nbsp;Yongjie Han ,&nbsp;Shihua Qi","doi":"10.1016/j.geothermics.2025.103254","DOIUrl":"10.1016/j.geothermics.2025.103254","url":null,"abstract":"<div><div>The northeastern margin of the Pamir Plateau in China is situated in the northwestern Tibetan Plateau, proximity to the Indo-Asian subduction zone. The region is characterized by intense tectonic activity, high terrestrial heat and abundant groundwater, contributing to the formation of an extremely promising high-temperature geothermal system. By integrating various data sources, including water chemistry, isotopes, volatile gases, and radiogenic element analysis, with regional structural and geological data, a local geothermal genetic model is proposed. The snowmelt water and atmospheric precipitation infiltrated along the deep fault are mixed with the deep magmatic water, and heated by the magma, granite radioactive elements, fracture friction and a small amount of mantle heat flow to form the deep parent material thermal fluid (370 °C). The parent material thermal fluid continues to expand and rise, dissolves the surrounding rock minerals, and forms multiple shallow and deep thermal reservoirs (111.68 °C-260.96 °C). The fluid in the geothermal reservoir rises again under the driving of pressure difference, and forms Group A high temperature hot water after adiabatic cooling. As the hot water migrates upward and laterally flows into the secondary fault, mixed cooling and conduction cooling occur, resulting in the formation of Group B and C medium and low temperature water. In the study area, medium and low temperature hot water of Groups B and C are formed. Due to the different degree of mixed cold water, Group C hot water shows relatively higher content of Ca<sup>2+</sup> and HCO<sup>3-</sup> ions and lower outcrop temperature compared with Group B. The recharge height of the geothermal water is inferred to be 3810–5540 m, and the recharge sources are mainly snowmelt water and atmospheric precipitation. These findings suggest a multi-faceted heat source regime, encompassing crustal radioactive heat generation, molten magma heat, tectonic frictional heat, and mantle heat flow.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"127 ","pages":"Article 103254"},"PeriodicalIF":3.5,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143148644","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
Analytical investigation on the optimal tube length of Earth-to-Air Heat Exchanger (EAHE)
IF 3.5 2区 工程技术 Q3 ENERGY & FUELS Pub Date : 2025-01-10 DOI: 10.1016/j.geothermics.2025.103250
Ali Alikhani, Mehdi Maerefat, Seyed Mohammad Jafar Sobhani
The Earth-to-Air Heat Exchanger (EAHE) is a promising passive technology that utilizes the earth's thermal energy for cooling/heating applications in buildings. The tube length is one of the crucial parameters affecting the EAHE system's thermal performance. Using this type of heat exchanger with an optimal tube length can help save materials, reduce operational costs, installation expenses, and required space. Selecting the optimal tube length is a major challenge for designers. In the present paper, a novel analytical study has been conducted to determine the optimal tube length of EAHE based on the Coefficient Of Performance (COP). The results of the optimal tube length in transient conditions reveal that it is affected by operation time. It is found that after 6 days of operation, thermal saturation in the soil around the tube takes place, and the ultimate optimal length is achieved which is about 37.9 % longer than the initial optimal length. Ignoring the ultimate soil thermal saturation may cause a false reduction in the estimated optimal tube length by about 57.9 % and an overestimation of the thermal performance of EAHE.
{"title":"Analytical investigation on the optimal tube length of Earth-to-Air Heat Exchanger (EAHE)","authors":"Ali Alikhani,&nbsp;Mehdi Maerefat,&nbsp;Seyed Mohammad Jafar Sobhani","doi":"10.1016/j.geothermics.2025.103250","DOIUrl":"10.1016/j.geothermics.2025.103250","url":null,"abstract":"<div><div>The Earth-to-Air Heat Exchanger (EAHE) is a promising passive technology that utilizes the earth's thermal energy for cooling/heating applications in buildings. The tube length is one of the crucial parameters affecting the EAHE system's thermal performance. Using this type of heat exchanger with an optimal tube length can help save materials, reduce operational costs, installation expenses, and required space. Selecting the optimal tube length is a major challenge for designers. In the present paper, a novel analytical study has been conducted to determine the optimal tube length of EAHE based on the Coefficient Of Performance (COP). The results of the optimal tube length in transient conditions reveal that it is affected by operation time. It is found that after 6 days of operation, thermal saturation in the soil around the tube takes place, and the ultimate optimal length is achieved which is about 37.9 % longer than the initial optimal length. Ignoring the ultimate soil thermal saturation may cause a false reduction in the estimated optimal tube length by about 57.9 % and an overestimation of the thermal performance of EAHE.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"127 ","pages":"Article 103250"},"PeriodicalIF":3.5,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143148227","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
Numerical analysis of far-field fault reactivation induced by reservoir cooling
IF 3.5 2区 工程技术 Q3 ENERGY & FUELS Pub Date : 2025-01-08 DOI: 10.1016/j.geothermics.2024.103234
Josselin Ouf , Philip J. Vardon , Kavan Khaledi , Wen Luo , Mohammadreza Jalali , Florian Amann
This study presents a thermo-hydro-mechanical framework to model hydrothermal systems within a simplified faulted synthetic reservoir, replicating current production scenarios in The Netherlands and Germany. The reservoir, composed of porous and permeable sandstone, and the confining layer, made of porous but less permeable shale, undergoes a process where cold water is injected and hot water is extracted. A fault, situated 750 meters from the injection well, is investigated to examine the conditions when fault slip could occur. Various fault and formation stiffnesses are modeled to assess their impact on fault stability. Our analysis reveals that stress changes induced by hydrothermal operations can lead to fault reactivation, with the stiffness contrast between the reservoir and confining layers playing a significant role in when and where fault reactivation can occur. Stiffer confining layers lead to reactivation occurring more closely associated with the passage of the cooling front. In contrast, a stiffer reservoir results in greater and more gradual stress changes, making reactivation more closely related to the total volume of cooled rock.
{"title":"Numerical analysis of far-field fault reactivation induced by reservoir cooling","authors":"Josselin Ouf ,&nbsp;Philip J. Vardon ,&nbsp;Kavan Khaledi ,&nbsp;Wen Luo ,&nbsp;Mohammadreza Jalali ,&nbsp;Florian Amann","doi":"10.1016/j.geothermics.2024.103234","DOIUrl":"10.1016/j.geothermics.2024.103234","url":null,"abstract":"<div><div>This study presents a thermo-hydro-mechanical framework to model hydrothermal systems within a simplified faulted synthetic reservoir, replicating current production scenarios in The Netherlands and Germany. The reservoir, composed of porous and permeable sandstone, and the confining layer, made of porous but less permeable shale, undergoes a process where cold water is injected and hot water is extracted. A fault, situated 750 meters from the injection well, is investigated to examine the conditions when fault slip could occur. Various fault and formation stiffnesses are modeled to assess their impact on fault stability. Our analysis reveals that stress changes induced by hydrothermal operations can lead to fault reactivation, with the stiffness contrast between the reservoir and confining layers playing a significant role in when and where fault reactivation can occur. Stiffer confining layers lead to reactivation occurring more closely associated with the passage of the cooling front. In contrast, a stiffer reservoir results in greater and more gradual stress changes, making reactivation more closely related to the total volume of cooled rock.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"127 ","pages":"Article 103234"},"PeriodicalIF":3.5,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143148658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Temperature transient analysis of a very high-permeability geothermal well: A numerical modelling approach
IF 3.5 2区 工程技术 Q3 ENERGY & FUELS Pub Date : 2025-01-03 DOI: 10.1016/j.geothermics.2024.103248
Jorge Alberto Rangel-Arista, Sadiq J. Zarrouk, Eylem Kaya
Geothermal well tests usually analyse the pressure response throughout a series of injection or production steps assuming isothermal conditions. However, the downhole tool also records the temperature response of the well. In recent years, temperature transient analysis (TTA) has attracted attention because of the improvement of sensors and computational tools, providing additional information about the reservoir and wellbore. This work examines a unique geothermal reservoir characterised by a highly fractured permeable zone, presenting a minimal pressure response during well (completion) testing. However, the temperature response shows a noticeable falloff and buildup throughout the injection-falloff test. We attempted to analyse the pressure response and its derivative using the numerical pressure transient analysis (PTA), but this did not yield reasonable results due to the small change in the transient pressure. Then, we included the analysis of temperature response utilising geothermal TTA through an updated numerical modelling framework. Employing this new approach made it possible to calculate the reservoir parameters by including temperature analysis through a series of time steps to examine the well-test data. Geothermal TTA showed the potential to complement PTA when insufficient. The examination of wells with very high permeability should include TTA to obtain reliable reservoir parameters.
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引用次数: 0
Unusual boron isotopic value and hydrochemical characteristics of thermal springs indicating magmatic fluids upwelling along Cuona-Sangri rift in the Tibet (China)
IF 3.5 2区 工程技术 Q3 ENERGY & FUELS Pub Date : 2025-01-02 DOI: 10.1016/j.geothermics.2024.103222
Peixin Cong , Hongbing Tan , Zhiwei Shi , Fei Xue , Franco Tassi , Yulong Li
Geothermal systems located in southern Tibet exhibit a considerable amount of potential energy and mineral resources. Thermal springs from Cuona Sangri Rift (CSR; China) are Cl-Na type and exhibit notable concentrations of minor elements (B, Li, Rb, and Cs) and unusually low δ11B values. This study aims to explore the source(s), and physico-chemical processes controlling the chemical and isotopic features of the thermal springs in relation with the active Cuona-Sangri rift zone (CSR). In order to trace the origin of both water and solutes in the CSR springs, we characterized the major and minor element compositions, along with the stable isotope ratios (δ2H-δ18O, δ11B), of the spring water. The anomalous abundance of B, Li, Rb, and Cs is possibly related to magmatic fluid input rather than just dependent on water-rock interactions. According to boron isotopes, the magmatic fluid component accounts for approximately 1.74 % to 8 % of the thermal water. A conceptual model is proposed to elucidate the intricate patterns of geothermal system deep groundwater circulation controlled by the deep fault zone.
{"title":"Unusual boron isotopic value and hydrochemical characteristics of thermal springs indicating magmatic fluids upwelling along Cuona-Sangri rift in the Tibet (China)","authors":"Peixin Cong ,&nbsp;Hongbing Tan ,&nbsp;Zhiwei Shi ,&nbsp;Fei Xue ,&nbsp;Franco Tassi ,&nbsp;Yulong Li","doi":"10.1016/j.geothermics.2024.103222","DOIUrl":"10.1016/j.geothermics.2024.103222","url":null,"abstract":"<div><div>Geothermal systems located in southern Tibet exhibit a considerable amount of potential energy and mineral resources. Thermal springs from Cuona Sangri Rift (CSR; China) are Cl-Na type and exhibit notable concentrations of minor elements (B, Li, Rb, and Cs) and unusually low δ<sup>11</sup>B values. This study aims to explore the source(s), and physico-chemical processes controlling the chemical and isotopic features of the thermal springs in relation with the active Cuona-Sangri rift zone (CSR). In order to trace the origin of both water and solutes in the CSR springs, we characterized the major and minor element compositions, along with the stable isotope ratios (δ<sup>2</sup>H-δ<sup>18</sup>O, δ<sup>11</sup>B), of the spring water. The anomalous abundance of B, Li, Rb, and Cs is possibly related to magmatic fluid input rather than just dependent on water-rock interactions. According to boron isotopes, the magmatic fluid component accounts for approximately 1.74 % to 8 % of the thermal water. A conceptual model is proposed to elucidate the intricate patterns of geothermal system deep groundwater circulation controlled by the deep fault zone.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"127 ","pages":"Article 103222"},"PeriodicalIF":3.5,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143148659","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
Study on dynamic mechanical properties and energy dissipation of cyclic impact high temperature bedding sandstone
IF 3.5 2区 工程技术 Q3 ENERGY & FUELS Pub Date : 2024-12-28 DOI: 10.1016/j.geothermics.2024.103246
Weimin Liang , Feng Han , Minmin Li , Mengfei Xu , Wenwu Tan
The study of the mechanical properties of bedding rocks at high temperatures is important for deep energy extraction and post-fire tunnel reconstruction. Firstly, the variation rules of apparent color, mineral components, quality, and longitudinal wave speed of bedding sandstone specimens before and after exposure to high temperatures (300°C–1100°C) were studied. Secondly, the cyclic impact test of high-temperature bedding sandstone was conducted using an electromagnetic-driven split Hopkinson pressure bar (SHPB) device. The effects of impact velocity, bedding angle, and temperature on the dynamic characteristics and energy dissipation of sandstone were studied. The results show that the higher the temperature, the darker the apparent color of the rock, the smaller the mass. The wave velocity exhibits a gradual decrease or initially decreases followed by an increase as the temperature rises. The polycrystalline transformation of minerals inside the bedding sandstone occurred after high temperature. The metamorphic temperature of the main mineral crystal quartz is in the range of 500°C∼700°C. As the temperature rises, the peak stress of the sandstone specimens initially exhibits a decrease followed by an increase, reaching a minimum at 900°C. The peak stress may display three distinct patterns in relation to increasing impact number: it may either increase progressively, initially increase and then decrease, or decrease progressively. Unlike sandstone specimens with other bedding angles, the energy absorption of 90° bedding sandstone gradually decreases with increasing temperature. Under cyclic impact loading, the absorption energy is greatest in 90° laminated sandstone, rendering it more susceptible to damage. These results offer theoretical foundation for managing dynamic disasters in deep rock engineering.
{"title":"Study on dynamic mechanical properties and energy dissipation of cyclic impact high temperature bedding sandstone","authors":"Weimin Liang ,&nbsp;Feng Han ,&nbsp;Minmin Li ,&nbsp;Mengfei Xu ,&nbsp;Wenwu Tan","doi":"10.1016/j.geothermics.2024.103246","DOIUrl":"10.1016/j.geothermics.2024.103246","url":null,"abstract":"<div><div>The study of the mechanical properties of bedding rocks at high temperatures is important for deep energy extraction and post-fire tunnel reconstruction. Firstly, the variation rules of apparent color, mineral components, quality, and longitudinal wave speed of bedding sandstone specimens before and after exposure to high temperatures (300°C–1100°C) were studied. Secondly, the cyclic impact test of high-temperature bedding sandstone was conducted using an electromagnetic-driven split Hopkinson pressure bar (SHPB) device. The effects of impact velocity, bedding angle, and temperature on the dynamic characteristics and energy dissipation of sandstone were studied. The results show that the higher the temperature, the darker the apparent color of the rock, the smaller the mass. The wave velocity exhibits a gradual decrease or initially decreases followed by an increase as the temperature rises. The polycrystalline transformation of minerals inside the bedding sandstone occurred after high temperature. The metamorphic temperature of the main mineral crystal quartz is in the range of 500°C∼700°C. As the temperature rises, the peak stress of the sandstone specimens initially exhibits a decrease followed by an increase, reaching a minimum at 900°C. The peak stress may display three distinct patterns in relation to increasing impact number: it may either increase progressively, initially increase and then decrease, or decrease progressively. Unlike sandstone specimens with other bedding angles, the energy absorption of 90° bedding sandstone gradually decreases with increasing temperature. Under cyclic impact loading, the absorption energy is greatest in 90° laminated sandstone, rendering it more susceptible to damage. These results offer theoretical foundation for managing dynamic disasters in deep rock engineering.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"127 ","pages":"Article 103246"},"PeriodicalIF":3.5,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143148211","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
期刊
Geothermics
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