Geothermics最新文献_第3页

3D gravity inversion constrained by a 3D resistivity model: Implication for the conceptual models of Fiale caldera and Gale-le-Koma geothermal prospects in the Asal Rift (Republic of Djibouti) 三维电阻率模型约束下的三维重力反演：对阿萨尔裂谷（吉布提共和国）Fiale火山口和Gale-le-Koma地热远景概念模型的启示

IF 3.5 2区工程技术

Geothermics Pub Date : 2025-05-19 DOI: 10.1016/j.geothermics.2025.103383

Rachid Robleh Ragueh , Pascal Tarits , Sophie Hautot , Mohamed Jalludin , Mohamed Osman Awaleh

{"title":"3D gravity inversion constrained by a 3D resistivity model: Implication for the conceptual models of Fiale caldera and Gale-le-Koma geothermal prospects in the Asal Rift (Republic of Djibouti)","authors":"Rachid Robleh Ragueh , Pascal Tarits , Sophie Hautot , Mohamed Jalludin , Mohamed Osman Awaleh","doi":"10.1016/j.geothermics.2025.103383","DOIUrl":"10.1016/j.geothermics.2025.103383","url":null,"abstract":"<div><div>Geothermal systems in the context of very active rifting, such as in the Republic of Djibouti, are complex to characterize. Despite the numerous geoscientific studies conducted over decades in recognized prospects such as Fiale Caldera and Gale-le-Koma in the Asal Rift, we do not understand well the mechanism of the geothermal resources, their relationships with the heat source at depth and the recharge of water. In an attempt to progress in this understanding, we present an analysis of 3-D gravity data inversion guided by a new three-dimensional electrical model to obtain constrained density models for each geothermal site. These models along with the resistivity model revealed highly fractured underground structures primarily influenced by two processes: geothermal activity from the rift and structural control from the active rift tectonics. These models are in good agreement with the lithology from boreholes, as well as with geochemical and hydrogeological data. The study presents revised conceptual models for the two geothermal systems. These conceptual models consist of a shallow reservoir and a deep reservoir at each site (Fiale Caldera and Gale-le-Koma geothermal prospects), primarily recharged by seawater from the Bay of Ghoubbet and possibly by regional meteorological groundwater recharges.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103383"},"PeriodicalIF":3.5,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084383","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

Imaging near-surface thermal anomalies for cost-effective detection of hidden geothermal resources: A case study in Shanxi province, North China 利用近地表热异常成像经济有效地探测隐伏地热资源——以山西为例

IF 3.5 2区工程技术

Geothermics Pub Date : 2025-05-17 DOI: 10.1016/j.geothermics.2025.103386

Guangzheng Jiang , Qinghai Guo , Yaqi Wang , Lei Guo , Meihua Wei , Jie Hu , Chao Zhang , Yingchun Wang , Shengbiao Hu

{"title":"Imaging near-surface thermal anomalies for cost-effective detection of hidden geothermal resources: A case study in Shanxi province, North China","authors":"Guangzheng Jiang , Qinghai Guo , Yaqi Wang , Lei Guo , Meihua Wei , Jie Hu , Chao Zhang , Yingchun Wang , Shengbiao Hu","doi":"10.1016/j.geothermics.2025.103386","DOIUrl":"10.1016/j.geothermics.2025.103386","url":null,"abstract":"<div><div>Geothermal energy is an environmentally friendly alternative energy source, but its widespread and large-scale utilization is limited by the high cost and risk for exploring and developing new areas. Conventional exploration methods face major challenges in detecting ground fluid and heat assemblage, highlighting the need for more efficient and economical geothermal exploration technologies. This paper proposes a method for detecting hidden geothermal resources by focusing on near-surface thermal anomalies. The temperature was measured over a 20 square kilometer area, which included 60 wells ranging in depth from 50 to 200 m The normalized temperature contour maps were drawn to delineate two distinct geothermal sweet spots: the western and eastern anomaly areas, which have maximum anomaly amplitudes of 100 % and 30 %, respectively. Geothermal resources in the western areas were confirmed through drilling, which produced hot water at 50 °C and a flow rate of 40 L/h from an 800-meter deep basement reservoir. The slight thermal anomaly in the eastern area is likely due to the Urban Heat Island effect rather than deep heat. These findings demonstrate the potential of using near-surface thermal anomalies for efficient and economical geothermal exploration and for studying the urban heat island effect on the surrounding underground thermal environment.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103386"},"PeriodicalIF":3.5,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144071123","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

Updated conceptual model of the hydrothermal system in the Acoculco Caldera, Mexico 墨西哥acococo火山口热液系统的更新概念模型

IF 3.5 2区工程技术

Geothermics Pub Date : 2025-05-16 DOI: 10.1016/j.geothermics.2025.103381

R.M. Prol-Ledesma , J.L. Carrillo de la Cruz , M.P. Jácome-Paz , D. Pérez-Zárate , I.A. González-Romo

{"title":"Updated conceptual model of the hydrothermal system in the Acoculco Caldera, Mexico","authors":"R.M. Prol-Ledesma , J.L. Carrillo de la Cruz , M.P. Jácome-Paz , D. Pérez-Zárate , I.A. González-Romo","doi":"10.1016/j.geothermics.2025.103381","DOIUrl":"10.1016/j.geothermics.2025.103381","url":null,"abstract":"<div><div>The Acoculco Caldera hosts a high-temperature geothermal system that has not been exploited due to the lack of permeability revealed by the deep exploration wells. Results of our detailed geological and geochemical exploration, integrated with previous results of electric and electromagnetic surveys, have shown large differences in the structures and hydrothermal activity between the northern and southern parts of the Caldera. Electromagnetic surveys indicate the presence of a large high conductivity anomaly towards the north of the caldera and very high resistivity where the deep wells were drilled, which is probably related to the intense silicification observed in the core samples from the deep wells. These disparities are enhanced by the presence of thermal springs and recent volcanics in the northern part, in addition to intense hydrothermal alteration and extremely high heat flow measured in shallow geothermal gradient wells drilled in the northern part of the caldera. Geochemistry of the thermal springs on the northern border of the Caldera is consistent with a hydrothermal reservoir with temperatures close to 300 °C. The Curie Point Depth (CPD) calculation yields a value 7 km that can be correlated with the geothermal gradient measured in the deep exploration wells only if convection is assumed in a layer at least 1 km thick. All this evidence suggests that a viable reservoir may be present at depth in the northern section of the Acoculco Caldera.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103381"},"PeriodicalIF":3.5,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144069647","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

Detecting thermal water layer with algorithm model utilizing well-logging reconstruction data: A case study of the Qingshankou formation, Songliao Basin 利用测井重建数据的算法模型探测热水层——以松辽盆地青山口组为例

IF 3.5 2区工程技术

Geothermics Pub Date : 2025-05-16 DOI: 10.1016/j.geothermics.2025.103388

Rongsheng Zhao , Feng Lu , Shasha Tang , Zhe Liu , Changli Liu , Zongbao Liu

{"title":"Detecting thermal water layer with algorithm model utilizing well-logging reconstruction data: A case study of the Qingshankou formation, Songliao Basin","authors":"Rongsheng Zhao , Feng Lu , Shasha Tang , Zhe Liu , Changli Liu , Zongbao Liu","doi":"10.1016/j.geothermics.2025.103388","DOIUrl":"10.1016/j.geothermics.2025.103388","url":null,"abstract":"<div><div>The conversion of “oil-geothermal” has become a hot topic in regions where petroleum reserves have been depleted but possess moderate to high ground heat flow values. This shift necessitates a rapid and objective redefinition of thermal water layers (WL), which were often overlooked during the oil exploration stage. In this study, we aimed to establish a rapid WL identification model based on traditional well-logging data, corrected for external influencing factors. Our findings suggest that: (1) optimizing well-logging data before developing algorithmic models is crucial, as it enhances the outcomes; (2) reconstructing well-logging data significantly increases the accuracy of algorithmic models from 67.24% to 92.41%, after accounting for the effects of clay minerals, cementation, drilling mud invasion, and variations in temperature and salinity; and (3) integrating different algorithmic models also improves identification accuracy (92.41% increased to 92.76%) and reduces the misidentification of oil layers (OL) as WL compared to single models (13.6% reduced to 4.5%). However, the order in which these algorithms are applied is important. Notably, the significant overlap in resistivity of the CaCl<sub>2</sub> type, primarily between 0.6 to 0.8 Ω·m, contributes to the highest rate of misidentifying OL as WL. And the new well also validated the universality of our models, demonstrating a high precision in WL identification and a low rate of misidentifying OL as WL. Although the established model enables rapid and objective WL identification, there are still some deficiencies that need to be addressed, especially in lithofacies character, layer thicknes and newest algorithm model application.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103388"},"PeriodicalIF":3.5,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144069648","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

Distribution characteristics and genesis of seawater-replenished geothermal systems on the western coast of the Taiwan Strait 台湾海峡西岸海水补给地热系统分布特征及成因

IF 3.5 2区工程技术

Geothermics Pub Date : 2025-05-16 DOI: 10.1016/j.geothermics.2025.103368

Chunlei Liu , Yuanjing Zhang , Yasong Li , Jing Li , Yan Dong

{"title":"Distribution characteristics and genesis of seawater-replenished geothermal systems on the western coast of the Taiwan Strait","authors":"Chunlei Liu , Yuanjing Zhang , Yasong Li , Jing Li , Yan Dong","doi":"10.1016/j.geothermics.2025.103368","DOIUrl":"10.1016/j.geothermics.2025.103368","url":null,"abstract":"<div><div>The highly mineralized geothermal waters along the western coast of the Taiwan Strait in Fujian Province offer critical insights into geothermal resource evolution. This study analyzed geothermal water collected from mountainous to coastal areas, focusing on hydrochemistry, hydrogen, oxygen, and noble gas isotopes. The waters were classified into two groups: Group B, primarily replenished by rainfall in mountainous and piedmont plains, has lower salinity and Na-HCO₃·SO₄ water types; in contrast, Group A, influenced by coastal rainfall and seawater infiltration, shows increasing salinity toward the coastline and Na-Cl dominance. Seawater mixing proportion ranged from 2.1- 88.3 % calculated by Br<sup>-</sup> mass equilibrium. A positive correlation observed between seawater proportion and structural permeability indicating distribution of saline geothermal water was controlled by permeability advantage of the fault zone and the multi-directional structural coupling. Hydrogeochemical differences are driven by water-rock interactions and seawater mixing. Reservoir temperatures estimated via quartz geothermometers and multi-mineral equilibrium methods range from 98.60 °C to 145.90 °C, corresponding to a maximum circulation depth of 6.15 km. He and Ne isotopes reveal crustal heat conduction and radiogenic heating as dominant heat sources, with mantle contributions in select geothermal fields. The heat generated by radioactive decay in granite is a significant contributor to groundwater thermal activity. This study elucidates the mechanisms driving the formation of saline geothermal water, heat sources, and evolution of geothermal systems in the seawater replenished region. These findings provide a scientific basis for the sustainable management and efficient utilization of geothermal resources in similar coastal environments.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103368"},"PeriodicalIF":3.5,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144071047","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 heat migration in biochar-biopolymer-based thermal backfill material 生物炭-生物聚合物基热回填材料热迁移的实验研究

IF 3.5 2区工程技术

Geothermics Pub Date : 2025-05-14 DOI: 10.1016/j.geothermics.2025.103379

Deepak Patwa , K. Ravi , S. Sreedeep

{"title":"Experimental investigation of heat migration in biochar-biopolymer-based thermal backfill material","authors":"Deepak Patwa , K. Ravi , S. Sreedeep","doi":"10.1016/j.geothermics.2025.103379","DOIUrl":"10.1016/j.geothermics.2025.103379","url":null,"abstract":"<div><div>Thermal backfill is required to maintain the appropriate temperature around underground thermally activated structures (TAS) to increase their thermal insulation performance. Biochar is a porous carbon-rich material with exceptional thermal insulation properties and a high degree of carbon stability in soil, making it appropriate to use as a thermal backfill. Therefore, this research work investigates heat transfer in soil-biochar composite (SBC) and soil-biochar-biopolymer composite (SBPC) as thermal backfill material. The thermal insulation potential of SBC and SBPC was examined by fabricating a soil column with highly plastic silty soil, sugarcane bagasse biochar, and hardwood biochar. To prepare samples, the soil is amended with 5 % and 15 % biochar (<em>w</em>/<em>w</em>) and (0.5 %, <em>w</em>/<em>w</em>) biopolymer. For heat transfer investigation, a heater rod was inserted into the center of the soil column, with temperature sensors installed at various radial distances of 25, 50, 75, 100, and 125 mm from the heater rod. Further, the spatio-temporal variations were recorded for two cycles of heating and ambient cooling. The results revealed that both SBC and SBPC exhibit lower temperatures than virgin soil throughout all radial distances and time during the 1st and 2nd heating and ambient cooling cycles. The maximum temperature difference between virgin soil and SBC varies from 4 °C (at 125 mm) to 20 °C (at 25 mm), depending upon the distance from the heater rod. The finding of this study established the SBC and SBPC can be efficiently used as thermal backfill to mitigate heat transfer from TAS.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103379"},"PeriodicalIF":3.5,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949027","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

Response to comments by Rosa María Prol-Ledesma on the manuscript: Data-driven Play Fairway Analysis applied to Los Humeros geothermal field, Mexico 对Rosa María Prol-Ledesma对手稿的评论的回应：数据驱动的球道分析应用于墨西哥Los Humeros地热田

IF 3.5 2区工程技术

Geothermics Pub Date : 2025-05-14 DOI: 10.1016/j.geothermics.2025.103384

Emmanuel Olvera-García , Jorge Alejandro Ávila-Olivera , Ángel Figueroa-Soto , Mark Coolbaugh , Domenico Liotta

引用次数: 0

Scale evaluation in geothermal fluids by a batch-type method using fiber optic scale sensor 利用光纤结垢传感器的间歇式地热流体结垢评价方法

IF 3.5 2区工程技术

Geothermics Pub Date : 2025-05-13 DOI: 10.1016/j.geothermics.2025.103387

Sakurako Satake , Ai Hosoki , Airi Suka , Yukiko Hoshino , Heejun Yang , Akira Ueda , Hideki Kuramitz , Amane Terai

{"title":"Scale evaluation in geothermal fluids by a batch-type method using fiber optic scale sensor","authors":"Sakurako Satake , Ai Hosoki , Airi Suka , Yukiko Hoshino , Heejun Yang , Akira Ueda , Hideki Kuramitz , Amane Terai","doi":"10.1016/j.geothermics.2025.103387","DOIUrl":"10.1016/j.geothermics.2025.103387","url":null,"abstract":"<div><div>We have previously developed a scale sensor that can quickly evaluate optimal conditions for preventing scale accumulation in surface pipes and wells that inhibit geothermal power plant (GPP) operation. To make this method more applicable to local facilities, this study developed an evaluation method using a batch-type measurement method. This method is a simple and versatile technique using batch process-based fiber optic sensor. A fiber optic sensor is immersed in the target geothermal water in the field, collected after several hours or days, and connected to a measurement device in the laboratory to measure the change in light transmittance before and after immersion to assess scale formation. Unlike conventional real-time measurements, the proposed method does not require on-site measurement equipment or a specialized laboratory. A highly sensitive and compact hetero-core fiber optic is used in the sensor section. We also developed a simple kit in which both ends of the sensor are fixed with Teflon protectors to prevent the sensor section from being cut and to simplify field operations. Furthermore, we compared the accuracy, reproducibility, economic efficiency, and versatility of the proposed method to the conventional real-time measurement method, and scale adhesion tests using metal coupons for silica scale at two GPPs and calcium carbonate scale at a hot spring facility. The proposed method exhibited a performance similar to that of the real-time measurement method. Moreover, the proposed method is easy to operate and does not require skilled personnel for on-site operations. In addition, this method can be used to make decisions in a short period of time when considering conditions for scale prevention by adding various inhibitors.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103387"},"PeriodicalIF":3.5,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143935876","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

Deep structure and geothermal genesis model of Xiong’an New Area, Northern China: Insights from 3D joint inversion of magnetotelluric and gravity data 雄安新区深部构造与地热成因模式——大地电磁与重力三维联合反演启示

IF 3.5 2区工程技术

Geothermics Pub Date : 2025-05-11 DOI: 10.1016/j.geothermics.2025.103382

Hanqing Qiao , Cai Liu , Jiangtao Han , Na Peng , Zhiwen Zeng , Pu Niu , Yihao Wu

{"title":"Deep structure and geothermal genesis model of Xiong’an New Area, Northern China: Insights from 3D joint inversion of magnetotelluric and gravity data","authors":"Hanqing Qiao , Cai Liu , Jiangtao Han , Na Peng , Zhiwen Zeng , Pu Niu , Yihao Wu","doi":"10.1016/j.geothermics.2025.103382","DOIUrl":"10.1016/j.geothermics.2025.103382","url":null,"abstract":"<div><div>Xiong'an New Area is one of the regions with the most favorable geothermal conditions in northern China, particularly with significant geothermal potential in the depths. However, past studies have focused on the identified geothermal fields, lacking exploration into the deep structure across the entire region, thus limiting the assessment of different geothermal fields and potential geothermal resources. We utilized magnetotelluric and gravity data in Xiong'an New Area and its surrounding regions to conduct 3D joint inversion. The geophysical model reveals the structure above 10 km depth. The depth of the deep thermal reservoir's top boundary ranges from 600 to 2500 m in the Rongcheng and Niutuozhen uplifts, 3000 to 4000 m in the Gaoyang low uplift, and exceeds 3500 m in other regions. The heat-controlling and water-conducting faults are identified, which control the structural patterns of the region. We established a deep geothermal genesis model for Xiong'an New Area. Influenced by mantle heat sources and radiogenic heat production, the Rongcheng and Niutuozhen geothermal fields feature Neogene strata as the caprock, with faults serving as water and heat conduits, and relatively shallow Wumishan Formation acting as thermal reservoirs. Conversely, the Gaoyang geothermal field has Neogene and Paleogene strata as caprock, controlled by faults and deeper thermal reservoirs. We conducted 2D steady-state heat conduction simulations. It was confirmed the differentiated structure was the key reason for the \"high in the north, low in the south\" geothermal field characteristics, and the depth of Gaoyang geothermal field (>3 km) may have greater geothermal potential.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103382"},"PeriodicalIF":3.5,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143931388","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 the spatial characteristics and controlling factors of subsurface temperature field in concealed Salt Lake geothermal reservoir, Yuncheng city, Shanxi Province, China 山西运城隐伏盐湖地热储层地下温度场空间特征及控制因素研究

IF 3.5 2区工程技术

Geothermics Pub Date : 2025-05-11 DOI: 10.1016/j.geothermics.2025.103378

Guopeng Wu , Guoxiong Chen , Jianzhou Chai , Jie Mao , Heyu Wang , Detao Wang

{"title":"Study on the spatial characteristics and controlling factors of subsurface temperature field in concealed Salt Lake geothermal reservoir, Yuncheng city, Shanxi Province, China","authors":"Guopeng Wu , Guoxiong Chen , Jianzhou Chai , Jie Mao , Heyu Wang , Detao Wang","doi":"10.1016/j.geothermics.2025.103378","DOIUrl":"10.1016/j.geothermics.2025.103378","url":null,"abstract":"<div><div>The middle- and low-temperature sandstone-type Salt Lake geothermal field in the Yuncheng region, located in the southern part of the Shanxi Rift, is situated beneath densely populated urban areas, which poses significant challenges for the exploration and development of geothermal fields. This study first revealed the subsurface temperature characteristics from temperature logs, further employed microtremor survey to explore the underlying structures controlling this temperature distribution and finally elucidate the underlying mechanism with numerical simulation. The results obtained from ordinary kriging-based interpolation of available borehole temperature logs show that the geothermal gradient and temperature maps at different depths all have the characteristics of high values in the southwestern part and low in the northeastern part. This pattern was interpreted to be separated by an NW-trending belt. The applied 2D microtremor survey identified a vertical low-velocity anomaly which is inferred to be a highly fractured zone. The numerical simulation, incorporating coupled heat transport and fluid flow processes, indicates that this highly fractured zone may facilitate the movement of cold surface lake water into deeper regions. During this process, the water absorbs heat, which effectively accounts for the low thermal anomalies observed in the eastern sections of Salt Lake geothermal reservoir. By integrating thermal investigation, microtremor survey and numerical simulation, this study successfully delineated temperature maps at different depths, but also explained the mechanism of geothermal anomalies. These findings offer valuable insights and a solid basis for exploring deep geothermal resources within Salt Lake district of Yuncheng city.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103378"},"PeriodicalIF":3.5,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143931389","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