Geothermics最新文献

{"title":"Geothermal exploration drilling targeting based on gis spatial analysis of existing well and geophysical data: Case study in the Kamojang geothermal field, West Java, Indonesia","authors":"Suryantini ,&nbsp;Emmanuel John M. Carranza ,&nbsp;Hendro Wibowo ,&nbsp;Agung Prihadi","doi":"10.1016/j.geothermics.2025.103425","DOIUrl":"10.1016/j.geothermics.2025.103425","url":null,"abstract":"<div><div>This paper discusses a concept for targeting exploration wells in a high enthalpy volcanic-associated geothermal system within a caldera setting. This well-targeting concept, particularly relevant in the early stages of geothermal development, is drawn from lessons learnt in the Kamojang Geothermal Field (KGF), West Java, Indonesia. This concept was developed by: (1) performing spatial analysis of common exploration data (such as geological and geophysical data), validated by production wells, to locate favorable zones for drilling; and (2) identifying which geophysical data and geological conditions have a strong or weak influence on drilling success, based on their relevance and importance specified by assigned weights. The higher the weights indicate the greater importance. In turn, this association was used as a guide for targeting exploration and production drilling in the highest probability zones, which could be highly beneficial, particularly in the early stages of development. The spatial analysis in this study utilized geophysical data obtained in analog form. Existing wells (both productive and non-productive) and structural geology were used to validate factor and favorability maps resulting from the spatial analysis. This study employed five factor maps: direct current (DC) resistivity, controlled source audio-frequency magnetotellurics (CSAMT), magnetic anomaly, Bouguer anomaly, and horizontal gradient (HG) of Bouguer anomaly, which are common exploration data in geothermal exploration. Using these factor maps, three favorability maps were computed using index overlay mathematical operation to forecast the presence of productive wells. Among these favorability maps, the one derived from CSAMT, HG, and magnetic factor maps revealed zones with higher favorability for productive wells. This suggests a stronger association of successful well locations with these three factor maps compared to others. This study contributes to addressing three important issues in a well-targeting concept using the index overlay method: (1) proper assignment of a weight to each factor map; (2) realistic classification of anomalous area in each factor map; and (3) better understanding of geothermal system prior to exploration drilling.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"132 ","pages":"Article 103425"},"PeriodicalIF":3.5,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144365409","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}

{"title":"Effects of temperature and anisotropy on the thermal conductivity of rocks and borehole heat flow study","authors":"Yakun Wang ,&nbsp;Guangzheng Jiang ,&nbsp;Hongyu Gu ,&nbsp;Yongzhe Zhao ,&nbsp;Lei Dong ,&nbsp;Chuanzhi Liao ,&nbsp;Chao Zhang ,&nbsp;Zhenyu Li ,&nbsp;Haozhu Zhang ,&nbsp;Tianming Huang","doi":"10.1016/j.geothermics.2025.103429","DOIUrl":"10.1016/j.geothermics.2025.103429","url":null,"abstract":"<div><div>Thermal conductivity plays a crucial role in Earth's interior heat transfer and the tectonic evolution driven by thermal processes. While previous studies have primarily focused on the effects of anisotropy and temperature on sedimentary rocks under ambient conditions, research on high-temperature conditions in collisional orogenic zones remains limited. This study investigates the thermal properties of slate and tuff samples from a borehole in the southern Himalaya region of the Tibetan Plateau using the Hot Disk (HD) method, with a particular focus on temperature dependence and directional anisotropy of thermal conductivity. Measurements of thermal conductivity, specific heat capacity, thermal diffusivity, and thermal conductivity anisotropy were conducted at temperatures ranging from 20 °C to 200 °C under atmospheric pressure. The results reveal: (1) The thermal conductivity of tuff decreases from 3.49 to 2.48 W·m⁻¹·K⁻¹, a decrease of 28.94 %, while that of slate decreases from 2.94 to 2.08 W·m⁻¹·K⁻¹, a decrease of 29.25 %. (2) Significant thermal conductivity anisotropy is observed in core samples, with horizontal-to-vertical conductivity ratios (α) ranging from 1.03 to 1.30, averaging 1.12, indicating preferential horizontal heat conduction. (3) An average geothermal gradient of 18.4 °C·km⁻¹ was determined by integrating borehole temperature logging data and applying least-squares fitting, with a thermal conductivity of 4.08 W·m⁻¹·K⁻¹ corrected for saturated water. The surface heat flux was initially 75.1 mW·<em>m</em>⁻² and was increased to 78.45 mW·<em>m</em>⁻² following topographic correction. The high heat flow background, combined with dominant horizontal heat transfer, creates favorable conditions for extensive lower crustal flow in the middle-to-lower crust. These findings not only provide direct geothermal evidence supporting the crustal flow model of the Tibetan Plateau, but also highlight the critical role of temperature-dependent and anisotropic thermal conductivity in shaping deep thermal structures in collisional orogenic zones.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"132 ","pages":"Article 103429"},"PeriodicalIF":3.5,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144365408","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}

{"title":"Reservoir impact optimization of geothermal utilization using stock reservoir modeling","authors":"Arkaitz Manterola Donoso ,&nbsp;María Gudjónsdóttir ,&nbsp;Egill Júlíusson ,&nbsp;Hlynur Stefánsson","doi":"10.1016/j.geothermics.2025.103430","DOIUrl":"10.1016/j.geothermics.2025.103430","url":null,"abstract":"<div><div>Studying the production impacts on both the reservoir and the environment is crucial for the sustainable utilization of geothermal resources. This study presents an approach that combines stock reservoir modeling (SRM) with production optimization to generate a more sustainable production schedule for geothermal wells. SRM is a quick-solving, data-driven method that uses only historical production data to model the relationship between extraction, recharge, and stock levels, allowing operators to predict the impact of production on geothermal systems efficiently.</div><div>One of the studys’ primary contributions is to generate 3D surfaces that link geothermal well productivity rates, output, and wellhead pressures, which provide a time-independent visual representation of well behavior and allow the study of production patterns. This methodology was tested with real production data, and the results confirm that SRM is an easy-to-use modeling technique that can model geothermal production impacts in high-temperature geothermal systems where well-to-well interactions are likely to be limited.</div><div>Additionally, the study introduces a novel approach to integrate SRM with production scheduling, considering technical, financial, and environmental parameters. The optimization model demonstrates the potential to prioritize wells based on characteristics such as CO2 emissions and enthalpy, resulting in a more sustainable production schedule. The results show a potential reduction in emissions without lowering its revenue compared to current operations.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"132 ","pages":"Article 103430"},"PeriodicalIF":3.5,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335879","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}

{"title":"Laboratory investigation of thermal feedback during groundwater heat pump operation","authors":"Taha Sezer ,&nbsp;Abubakar Kawuwa Sani ,&nbsp;Rao Martand Singh ,&nbsp;Liang Cui","doi":"10.1016/j.geothermics.2025.103426","DOIUrl":"10.1016/j.geothermics.2025.103426","url":null,"abstract":"<div><div>Groundwater heat pump (GWHP) system is an efficient technology that can provide both heating and cooling to buildings, leading to considerable energy savings. During operation, injection can cause a change in the abstraction temperature, known as thermal feedback, a well-studied phenomenon over the years mainly based on numerical studies. However, there are only a limited number of experimental studies exploring the impacts of groundwater flow rates and different operational configurations for cooling and heating systems on thermal plume development for a well doublet. To address this gap, a laboratory-scale experimental investigation was conducted for cooling and heating operation of soil, considering two different operation types: Cooling and Heating (CH), and Aquifer Thermal Energy Storage (ATES). The setup was designed to conduct the experiments under groundwater flow to investigate its impact on thermal feedback. The results suggest that the ATES operation significantly enhances efficiency by utilising stored groundwater from cooling period for the heating period. The ATES operation led to a 29 % increase in efficiency during the heating period when compared to CH operation. The influence of the presence of groundwater flow was found to be &lt;10 %, although it may have a more significant impact in long-term operation as it disperses the thermal plume, affecting the abstraction temperature further.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"132 ","pages":"Article 103426"},"PeriodicalIF":3.5,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144314073","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}

{"title":"Exploring geothermal potential with robust satellite techniques using MODIS LST data","authors":"Jiangqin Chao ,&nbsp;Zhifang Zhao ,&nbsp;Zhibin Lai ,&nbsp;Jianyu Liu ,&nbsp;Yunfei Hu ,&nbsp;Daman Cui","doi":"10.1016/j.geothermics.2025.103414","DOIUrl":"10.1016/j.geothermics.2025.103414","url":null,"abstract":"<div><div>Thermal infrared remote sensing is an emerging technique for detecting geothermal anomalies in volcanically and tectonically active regions. This study evaluates its applicability for geothermal prospecting and thermal activity monitoring in southwestern Yunnan, China-a remote frontier characterized by dense vegetation and complex terrain. Despite its considerable geothermal potential, the region remains underexplored due to limited accessibility and the lack of long-term thermal monitoring. We applied Robust Satellite Techniques (RST) to 21 years (2003-2023) of MODIS nighttime Land Surface Temperature (LST) imagery. Thermal anomalies were extracted using the RETIRA index (threshold ≥ 4) with a cumulative frequency cutoff of ≥ 30. Anomalies were most prominent at intersections of active faults, with the most favorable geothermal zones occurring where anomalies coincided with mapped fault structures. A distinct W-shaped anomaly belt, consistent with previous surveys, was delineated in the Lianghe-Tengchong region. Of 61 known geothermal sites, 38 (∼63%) were detected using LST anomalies alone; this increased to 84% when fault data were incorporated. In Yingjiang County, anomalies aligned with historical seismic swarms, while in Longling, they corresponded with both earthquakes and hot springs, suggesting a fault-thermal-seismic relationship. Although hydrothermal alteration zones showed only partial spatial overlap with thermal anomalies, they further support the role of faults in facilitating subsurface heat transport. These findings demonstrate that RST, when applied to long-term MODIS LST data, provides an effective and scalable approach for geothermal exploration in tectonically active and data-scarce regions.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"132 ","pages":"Article 103414"},"PeriodicalIF":3.5,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144307528","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}

{"title":"Geofluid circulation enhanced downhole heat exchanger for highly efficient heat extraction: Mechanism and optimization","authors":"Huaiyu Jin ,&nbsp;Shuowen Ren ,&nbsp;Yuhang Zhang ,&nbsp;Hao Zheng ,&nbsp;Yizhe Shu ,&nbsp;Riyi Lin ,&nbsp;Zhengda Yang","doi":"10.1016/j.geothermics.2025.103424","DOIUrl":"10.1016/j.geothermics.2025.103424","url":null,"abstract":"<div><div>The Downhole Heat Exchanger (DHE) is critical for the development of geothermal energy. However, conventional DHEs experience a gradual reduction in heat extraction efficiency over time. The study developed a geothermal heat extraction scheme based on forced convection of geothermal fluid (geofluid), with the heat transfer process simulated using an experimental setup. Experimental results showed that enhanced DHE achieves higher temperature rises than the conventional version. This confirms the feasibility of enhancing heat transfer efficiency through forced geofluid circulation. Building on this, the study further investigated the mechanism of the enhanced DHE through numerical simulations, aiming to reveal its heat transfer characteristics and optimize parameters including geofluid flow direction, circulation rate, production casing length, and outer casing length. The results show that the enhanced DHE outperforms the conventional version in production temperature, heat extraction power, and net power. Continuous production creates a low-temperature region near the reinjection point, affecting long-term performance. Geofluid circulation acts as the key mechanism for heat extraction, intricately linking the evolution of heat extraction with geofluid flow in the aquifer. It is recommended to circulate geofluid upstream at a rate of 400 m³/d. Extending the lengths of the middle casing and outer casing enhances heat extraction power. By balancing heat transfer efficiency and economic cost, the optimal casing lengths are 200 m for the middle casing and 300 m for the outer casing. These findings provide valuable insights into optimizing key parameters for enhanced DHEs.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"132 ","pages":"Article 103424"},"PeriodicalIF":3.5,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144314074","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}

{"title":"Lithospheric thermal structure in the Dongpu Depression, Bohai Bay Basin, North China","authors":"Yiyu Yao ,&nbsp;Yinhui Zuo ,&nbsp;Kangnan Yan ,&nbsp;Shu Jiang ,&nbsp;Guangzheng Jiang ,&nbsp;Jiancheng Zeng ,&nbsp;Yongshui Zhou ,&nbsp;Jiazhen Zhang ,&nbsp;Ruyang Yu ,&nbsp;Ziwei Tang","doi":"10.1016/j.geothermics.2025.103423","DOIUrl":"10.1016/j.geothermics.2025.103423","url":null,"abstract":"<div><div>The Dongpu Depression is located in the eastern part of the North China Craton, which is the central region of lithospheric destruction and thinning of the North China Craton. The North China Craton is considered an ideal laboratory for studying the thinning and modifications of the ancient lithosphere. Based on rock thermal properties, the present geothermal field, and crustal structure, the thermal lithospheric thickness was calculated using a one-dimensional steady-state heat conduction equation. Assuming that heat is transferred by conduction and that rock thermal conductivity and radiogenic heat production rates are constant, a crustal model is developed. The heat flow generated by radioactive elements is calculated layer by layer through the \"back stripping\" method, which allows the determination of crustal heat flow, mantle heat flow, and Moho temperature. The results reveal that the thermal lithospheric thickness in the Dongpu Depression varies between 81.9 km and 90.8 km, with mantle heat flow ranging from 37.5 mW/m² to 42.0 mW/m². The ratio of mantle heat flow to surface heat flow is 60.8 %, and the temperature at the Moho interface ranges from 646 °C to 701 °C. These findings suggest a thin thermal lithosphere, a high ratio of mantle to surface heat flow, and elevated Moho temperatures, indicative of a “hot mantle and cold crust” lithospheric thermal structure. The lithospheric thermal structure of the Dongpu Depression indicates that its formation was controlled by extensional tectonics since the Cenozoic, the subduction of the western Pacific Plate, later plate retreat, and deep fault activities including the Lanliao, Yellow River, and Changyuan faults within the basin. This study may offer valuable heat source data for exploring geothermal and oil and gas resources in the Dongpu Depression.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"132 ","pages":"Article 103423"},"PeriodicalIF":3.5,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144297801","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}

{"title":"Characteristics of the radiogenic heat production in granitoids from southern Tibetan Plateau: Thermal and geodynamic implications","authors":"Haozhu Zhang ,&nbsp;Chao Zhang ,&nbsp;Guangzheng Jiang ,&nbsp;Zepeng Liu ,&nbsp;Junji Chen ,&nbsp;Yakun Wang ,&nbsp;Chuanzhi Liao","doi":"10.1016/j.geothermics.2025.103413","DOIUrl":"10.1016/j.geothermics.2025.103413","url":null,"abstract":"&lt;div&gt;&lt;div&gt;The long-lived radioactive isotopes of U, Th, and K serve as the principal heat-producing elements in rocks. Investigating the concentrations of these radiogenic elements and their associated heat production rates within the extensively distributed granitoids of the southern Tibetan Plateau not only provides important insights into the heat source mechanisms and genetic models of the widely distributed high-temperature geothermal resources in the region but also offers valuable contributions to understanding the geodynamic characteristics of the area. In this study, we systematically compiled geochemical data for granitoids from the southern Tibetan Plateau spanning several decades, resulting in a dataset of 1293 radiogenic heat production rate (RHPR) values. Representing the first systematically RHPR dataset for the southern Tibetan Plateau so far. The statistical analysis reveals average concentrations of U, Th, and K of 3.87 ± 3.99 ppm (Range: 0.11 ∼ 53.87 ppm), 18.38 ± 14.46 ppm (Range: 0.19 ∼ 118 ppm), and 3.06 ± 1.21 % (Range: 0.02 ∼ 8.03 %), respectively. The average Th/U and K/U ratios were found to be 6 ± 4.12 (Range: 0.06 ∼ 64.09) and 1.27 ± 1.03 (× 10&lt;sup&gt;4&lt;/sup&gt;) (Range: 0.01 × 10&lt;sup&gt;4&lt;/sup&gt; ∼ 9.93 × 10&lt;sup&gt;4&lt;/sup&gt;), respectively. The average RHPR of granitoids from the southern Tibetan Plateau was calculated to be 2.57 ± 1.79 μW/m&lt;sup&gt;3&lt;/sup&gt; (Range: 0.05 ∼ 15.06 μW/m&lt;sup&gt;3&lt;/sup&gt;), and the data display a well-defined normal distribution. The average concentrations of U, Th, K, and RHPR are lowest during the Mesozoic, with Th showing the highest average concentration in the Late Paleozoic, while the other elements peak during the Cenozoic. The Th/U ratio exhibits a gradual decline with younger geological ages, whereas the K/U ratio is highest in the Mesozoic and lowest in the Cenozoic. The spatial distribution of RHPR reveals a clear trend of gradually decreasing RHPR values from north to south across the southern Tibetan Plateau, with the Qiangtang, Lhasa, and Himalayan blocks exhibiting RHPR values of 3.1 ± 1.42 μW/m&lt;sup&gt;3&lt;/sup&gt;, 2.46 ± 1.83 μW/m&lt;sup&gt;3&lt;/sup&gt;, and 2.25 ± 1.84 μW/m&lt;sup&gt;3&lt;/sup&gt;, respectively.&lt;/div&gt;&lt;div&gt;Although the RHPR values in the southern Tibetan Plateau are generally lower than those in other high-temperature geothermal fields where granitoid radiogenic heat predominates, elevated RHPR values are still observed in certain regions, such as Gonghe Basin, Cooper Basin which is located in Australia. Based on the RHPR data collected in this study and information on the enrichment layers of radiogenic heat-producing elements in the crust, the radiogenic heat contribution of granitoids to the terrestrial heat flow was estimated, The results show that the heat contribution of granitoid in the Qiangtang, Lhasa, and Himalayan blocks was estimated to be 29.4 ∼ 39.2 μW/m&lt;sup&gt;3&lt;/sup&gt;, 23.6 ∼ 31.5 μW/m&lt;sup&gt;3&lt;/sup&gt;, and 21.3 ∼ 28.4 μW/m&lt;sup&gt;3&lt;/sup&gt;, respectively. The above results further emphasize the significant rol","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"132 ","pages":"Article 103413"},"PeriodicalIF":3.5,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289025","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}

{"title":"Geodynamic correlation between the Hainan plume and the heat flow along the Southeast Coast of China: Numerical simulation","authors":"Huihui Zhang ,&nbsp;Lijuan He ,&nbsp;Chaoqiang Chen ,&nbsp;Lanyong Guo","doi":"10.1016/j.geothermics.2025.103411","DOIUrl":"10.1016/j.geothermics.2025.103411","url":null,"abstract":"<div><div>The relationship between surface heat flow, geothermal resources, and the mantle plume has always been a hot topic in geothermics. Based on the latest heat flow data analysis, we find that away from the Hainan plume, the heat flow demonstrates an increasing trend toward the northeast, and the southeast China coast is a high heat flow belt. Additionally, there is a thin crustal belt that coincides with the high heat flow belt along the southeast China coast, along which a series of mantle plume-derived basalts have developed, and the age of these basalts gradually increases as away from the Hainan plume. To explain the correlation between the Hainan plume and the heat flow along the southeast China coast, we propose a dynamic model to simulate the thermal evolution process of the South China Block as it moved above the Hainan plume since 80 Ma. The modeling results show that a lithospheric high-temperature zone began to be formed in Fujian Province when it was located above the Hainan plume at 80 Ma. Subsequently, the South China Block moved to the northeast at a rate of 1.8 cm/year, and the lithospheric high-temperature zone was also gradually away from the Hainan plume, resulting in the current heat flow showing an increasing trend from Hainan Province to Fujian Province. Our results provide a novel explanation for the correlation between the Hainan plume and the heat flow along the southeast China coast, which might shed light on exploring geothermal resources along the southeast China coast.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"132 ","pages":"Article 103411"},"PeriodicalIF":3.5,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144272390","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}

{"title":"The use of passive seismic noise to constrain seismic velocities in mountainous geothermal systems","authors":"Ilaria Barone ,&nbsp;Alessandro Brovelli ,&nbsp;Valentina Rigoni ,&nbsp;Giorgio Cassiani","doi":"10.1016/j.geothermics.2025.103400","DOIUrl":"10.1016/j.geothermics.2025.103400","url":null,"abstract":"<div><div>Geothermal hot-spots are often located in mountainous or volcanic areas, where strong heterogeneity and rough topography are expected. Medium-to-deep and deep geothermal projects require monitoring of the local seismicity, in order to reduce the seismic hazard associated with the operations. The location uncertainty of seismic events depends on many parameters, including the accurate knowledge of the subsoil in terms of seismic velocities. In this work passive seismic interferometry has been applied to one-year seismic ambient noise data recorded by a microseismic monitoring network close to Yverdon-les-Bains, Switzerland, where the development of some geothermal doublets is being considered. The proposed workflow is based on the retrieval of empirical Green’s functions from station pair correlations, on the estimation of phase velocities, and on their depth inversion. The adopted workflow considers and corrects for possible biases given by rough topography and non-homogeneous distribution of noise sources, an important source of errors in urbanized areas. The obtained quasi-3D seismic velocity model was used to relocate three seismic events in the vicinity of the geothermal project. The results show that seismic interferometry is a cost-effective method to infer a site-specific shear-wave velocity cube for the frequency range of interest for seismological applications. Passive data were also used to estimate the resonance behaviour of the study area, that reflects the great complexity of both subsurface structures and topography.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"132 ","pages":"Article 103400"},"PeriodicalIF":3.5,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144262560","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}