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Experimental study of a novel in-tube spray evaporative condenser for geothermal power generation Geothermics (IF 3.9) Pub Date : 2024-04-22 Dongxi Liu, Di Gu, Wei Zhang, Qingyao Meng, Tianyi Sun
To enhance the efficiency of medium to low-temperature geothermal power systems, we designed a novel in-tube spray evaporative condenser. Experimental setups for single-tube heat exchange were devised, examining both water-water and working fluid-water configurations. The study analyzed the impact of air volume and hot water flow rate on heat transfer. Economic comparisons were made in laboratory conditions
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An Improved Fracture Seismic Method for identifying the drilling targets of medium-deep geothermal resources: A case study on heishan geothermal area Geothermics (IF 3.9) Pub Date : 2024-04-20 Chao Xu, Jie Li, Ruizhao Yang, Jingrui Chen, Hui Tan
The Heishan geothermal area is located at southern area of the gigantic rock body of the Lincang Granite in western Yunnan, where the groundwater system and geothermal fluids are mainly distributed along the Heishan-Hejian fault with exposed temperatures ranging from 85 °C to 99 °C and an average geothermal gradient exceeding 49 km/ °C, showing a high potentiality for power generation. In order to
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Evaluation of the viability of exploitation of hydrothermal resources in the Southern Songliao Basin (China) by integrating resource, demand, and economy Geothermics (IF 3.9) Pub Date : 2024-04-17 Weifei Yang, Changlai Xiao, Zilong Jia, Xiujuan Liang, Bo Feng
The major plains and sedimentary basins in China are endowed with abundant hydrothermal resources which have huge potential for exploitation. However, since existing evaluations at a regional scale are of limited precision, the suitability of hydrothermal extraction remains uncertain. The suitability of hydrothermal exploitation is mainly affected by three factors: reserves of energy resources, economic
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Effectiveness of injection protocols for hydraulic stimulation in enhanced geothermal systems Geothermics (IF 3.9) Pub Date : 2024-04-13 Sri Kalyan Tangirala, Francesco Parisio, Iman Vaezi, Víctor Vilarrasa
To harness the immense potential of geothermal energy for non-intermittent baseload power, low-permeability crystalline hot rocks need to be hydraulically stimulated to create Enhanced Geothermal Systems (EGS) that enable economically profitable fluid flow rates. However, hydraulic stimulation is usually associated with seismic activity that has led to project cancellation in a few occasions. To improve
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Hydromechanical modeling of the hydraulic stimulations in borehole PX2 (Pohang, South Korea) Geothermics (IF 3.9) Pub Date : 2024-04-12 Andrés Alcolea, Peter Meier, Víctor Vilarrasa, Sebastià Olivella, Jesús Carrera
A 5.5 earthquake struck Pohang (South Korea) on November 2017, following a sequence of five hydraulic stimulations of an Enhanced Geothermal System (EGS). The processes that led to this earthquake, which nucleated two months after the end of the last stimulation in borehole PX2, are not well understood yet. We propose a hydromechanical model that integrates available data to understand the potential
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Dynamic geothermal resource assessment: Integrating reservoir simulation and Gaussian Kernel Density Estimation under geological uncertainties Geothermics (IF 3.9) Pub Date : 2024-04-11 Xiaoming Tian, Yanlong Kong, Yulie Gong, Yonghui Huang, Shejiao Wang, Guanglin Du
This paper presents a dynamic geothermal resource assessment method that integrates reservoir simulation and Gaussian kernel density estimation (KDE). This approach addresses geological uncertainties by employing reservoir simulation techniques to model the fluid and heat flow under the condition of permeability heterogeneity. Incorporating probabilistic resource assessment through Gaussian KDE, the
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Geothermal water boron enrichment patterns in the Quantou Formation, central depression of the southern Songliao Basin Geothermics (IF 3.9) Pub Date : 2024-04-10 Linzuo Zhang, Xiujuan Liang, Weifei Yang, Changlai Xiao, Jiang Zhang, Xinkang Wang, Rongkun Dai
The presence of boron (B) in geothermal water is prevalent and detrimental to the growth and utilization of geothermal resources. The Songliao Basin is a typical sedimentary basin-type geothermal system characterized by elevated B concentrations and an abundance of geothermal resources. However, the precise origins, pathways, and mechanisms of B enrichment in the basin are still unknown, which limits
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Numerical study of soil heat and moisture migration in seasonal ground heat storage Geothermics (IF 3.9) Pub Date : 2024-04-05 Mengyao He, Youtang Wang, Ruiren Zhang, Fang He, Frank Behrendt, Chengyu Li
Heat and moisture transfer is an important factor leading to soil drying shrinkage and heat transfer attenuation in the process of seasonal soil heat storage with high temperature. The purpose of this study is to establish a numerical model to explore the characteristic of heat and moisture migration in heat storage soil. The numerical model is verified by the experimental data. In this study, two
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CO2 fracturing of volcanic rocks under geothermal conditions: Characteristics and process Geothermics (IF 3.9) Pub Date : 2024-04-05 Kohei Takuma, Yutaro Maeda, Yuto Watanabe, Sho Ogata, Kiyotoshi Sakaguchi, Eko Pramudyo, Daisuke Fukuda, Jiajie Wang, Kazumi Osato, Amane Terai, Noriaki Watanabe
An enhanced geothermal system using carbon dioxide (CO) for both reservoir creation and thermal energy extraction has attracted attention; however, studies on the CO fracturing of volcanic rocks under geothermal conditions are lacking. This study aimed to elucidate CO fracturing characteristics and processes in geothermal volcanic rocks via integrated lab-scale fracturing experiments and numerical
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Shear behavior of thermally damaged rock using the bonded-particle model based on moment tensor Geothermics (IF 3.9) Pub Date : 2024-04-04 Xiting Long, Jianjun Hu, Zhihe Wang, Changtai Zhou
It is critical to understand the temperature-dependent shear behavior of rock in exploiting deep natural resources-geothermal energy, coal, and oil. The shear behavior of thermally damaged rock needs to be further clarified from a micromechanical perspective. In this study, a series of direct shear tests are performed on thermally damaged sandstone using the bonded-particle model (BPM) with thermal
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Lithogeochemistry of the Nesjavellir geothermal field, SW Iceland—Implications for elemental mass movement in active geothermal systems Geothermics (IF 3.9) Pub Date : 2024-04-03 Diego I. Toro Vivanco, Barbara I. Kleine-Marshall, Maud J. Smit, Sveinborg H. Gunnarsdóttir, Hjalti Franzson, Andri Stefánsson
The lithogeochemistry of altered basalts was investigated to assess elemental mass changes in the active meteoric water dominated geothermal system at Nesjavellir, SW Iceland. The study revealed that elemental mass changes upon hydrothermal alteration is rather limited and the extent of metasomatism is controlled by the type of alteration minerals. Large mass movement was detected in volatiles (C and
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Machine learning for robust structural uncertainty quantification in fractured reservoirs Geothermics (IF 3.9) Pub Date : 2024-04-03 Ali Dashti, Thilo Stadelmann, Thomas Kohl
Including uncertainty is essential for accurate decision-making in underground applications. We propose a novel approach to consider structural uncertainty in two enhanced geothermal systems (EGSs) using machine learning (ML) models. The results of numerical simulations show that a small change in the structural model can cause a significant variation in the tracer breakthrough curves (BTCs). To develop
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Flow-controlled thermal response test and its comparison with the conventional test methods Geothermics (IF 3.9) Pub Date : 2024-04-03 Murat Aydin, Ayse Ozdogan Dolcek, Mustafa Onur, Altug Sisman
A novel flow-controlled (FC) thermal response test (TRT) system is introduced to resolve the recently addressed inconsistency between the constant heat flux (CHF) and constant temperature (CT) TRTs. FC-TRT allows us to keep both inlet and outlet temperatures constant and improve the accuracy of CT-TRT. Using the FC-TRT system, four types of TRT experiments are performed, providing CT, CHF, and constant
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Integration of triaxial ultrasonic velocity and deformation rate analysis for core-based estimation of stresses at the Utah FORGE geothermal site Geothermics (IF 3.9) Pub Date : 2024-04-03 Andrew Bunger, Joshua Higgins, Yao Huang, Olivia Hartz, Mark Kelley
Core-based methods for in-situ stress estimation were applied using samples from 4 intervals within the Utah FORGE 16A(78)-32 well. At three of these locations, Triaxial Ultrasonic Velocity (TUV) tests were performed, resulting in experimentally-determined relationships between wave velocities and stresses. Non-monotonic increases in the velocity-stress relationships provide evidence of stress history
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A new method for investigating the impact of temperature on in-situ reservoir properties using high-temperature AFM Geothermics (IF 3.9) Pub Date : 2024-03-30 Jingjie Wu, Hao Xu, Bo Xiong, Chaohe Fang, Shejiao Wang, Peng Zong, Ding Liu, Fudong Xin
Accurately evaluating the influence of temperature variations is crucial for geothermal engineering. Existing conventional testing methods are limited in providing detailed characterizations of reservoir micro properties at high temperatures. This study employed variable-temperature AFM testing techniques to examine sandstone and limestone under in-situ temperatures (25-200°C). The study analyzed the
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Using time-lapse seismic velocity changes to monitor the Domo de San Pedro Geothermal field, Mexico Geothermics (IF 3.9) Pub Date : 2024-03-29 F. Muñoz-Burbano, M. Calò, G. Savard, V. Reyes-Orozco, M. Lupi
The Domo de San Pedro Geothermal field, located in the westernmost part of the trans-Mexican volcanic belt, is part of a silicic volcanic complex. Geothermal energy is produced since 2015 from 9 wells as deep as 3 km. We monitor geothermal operations using a continuous seismic dataset from a temporary network of 20 broadband stations from March 2021 to January 2022. The well logs describing the geothermal
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Seismic monitoring of EGS fracture stimulations at Utah FORGE (Part 1): Time-lapse variations of b-values and Shear-wave Splitting Rates of induced microearthquakes Geothermics (IF 3.9) Pub Date : 2024-03-28 David Li, Lianjie Huang, Yingping Li, Yingcai Zheng, Joseph Moore
Characterizing geologic formations near geothermal wells is crucial for efficient extraction of subsurface geothermal energy resources. To monitor effective fracture stimulation of enhanced geothermal systems (EGS), we analyze a catalog of induced microearthquakes to characterize seismicity induced by Phase 2C fracture stimulations of the Utah FORGE project and derive the b-values for 424 induced microearthquakes
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Demonstration by laboratory experiments of thermosiphon effect in the closed loop carbon dioxide circulation system Geothermics (IF 3.9) Pub Date : 2024-03-28 Hiroshi Suenaga, Yoshinobu Nakao, Toshiaki Fukada
The thermosiphon effect has been shown theoretically to exist in the closed loop CO circulation geothermal power generation systems. We verified this effect based on previous numerical studies that determined the conditions under which the thermosiphon effect can be established and we developed laboratory experimental apparatus with conditions analogous to those in the previous studies. The results
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Performance prediction of a ground source heat pump system using denoised long short-term memory neural network optimised by fast non-dominated sorting genetic algorithm-II Geothermics (IF 3.9) Pub Date : 2024-03-22 Wang Chaoran, Yu Xiong (Bill), Han Chanjuan
The ground source heat pump (GSHP) is a commonly employed technique that utilises geothermal resources to heat or cool buildings, offering an advantageous alternative for reducing conventional energy consumption. Considering that the output energy of GSHP system is a critical criterion for evaluating the geothermal energy extraction, this study proposes an improved long short-term memory (LSTM) model
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Slow failure during faulting and formation of a porous framework under hydrothermal conditions: Role of feldspar sintering in granitoids Geothermics (IF 3.9) Pub Date : 2024-03-22 Manami Kitamura, Miki Takahashi, Norio Shigematsu
Earthquakes induced during the construction of fracture reservoirs in granitoids are an important issue for the development of ultra-high-enthalpy geothermal systems. We performed axial compression experiments on granite specimens under hydrothermal conditions to evaluate this potential, simulating Quaternary granitoids at approximately 4 km depth. Our experiments were primarily conducted under a confining
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Advanced machine learning techniques: Forecasting thermal resistance in borehole heat exchanger system through RSM and hybrid DFNN-GA approaches Geothermics (IF 3.9) Pub Date : 2024-03-21 Makarakreasey King, Chan-Young Yune
The thermal efficiency of ground heat exchanger (GHEs) relies on optimizing borehole thermal resistance and total internal thermal resistance for cost-effective and efficient design. This study aims to establish a robust correlation among various parameters, including thermal conductivity of pipe, grout, and ground, borehole depth, borehole and pipe diameter, pipe-pipe distance, fluid velocity, and
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Source mechanism of kHz microseismic events recorded in multiple boreholes at the first EGS Collab testbed Geothermics (IF 3.9) Pub Date : 2024-03-19 Yan Qin, Jiaxuan Li, Lianjie Huang, Martin Schoenball, Jonathan Ajo-Franklin, Douglas Blankenship, Timothy J. Kneafsey, EGS Collab Team
Continuous microseismic monitoring using three-component (3C) accelerometers deployed in multiple boreholes allows for tracking the detailed evaluation of mesoscale (10 m scale) fracture growth during the fracture stimulation experiments at the first Enhanced Geothermal Systems (EGS) Collab testbed. Building on a well-constrained microseismic event catalog, we invert for moment tensor of the events
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Numerical simulation of single-well enhanced geothermal power generation system based on discrete fracture model Geothermics (IF 3.9) Pub Date : 2024-03-18 Lingbao Wang, Huashan Li, Yulie Gong, Xianbiao Bu
This study proposes a single-well enhanced geothermal system (SEGS) to mitigate the high-risk of traditional Enhanced Geothermal Systems (ESGs) with two or more wells and enhance the general applicability. A detailed thermodynamic model that couples the wellbore, reservoir, and organic Rankine cycle is built. For the reservoir, a three-dimensional flow and heat transfer model featuring a discrete fracture
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Multi-isotopes (H, O, Sr, and Li) and element geochemistry constrain the formation of Kongchutso helium-rich geothermal field in western Tibet, China Geothermics (IF 3.9) Pub Date : 2024-03-16 Yanyan Li, Ping Zhao, Ji Dor, Haichao Zhang
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Life Cycle Assessment of an Aquifer Thermal Energy Storage System: Influence of design parameters and comparison with conventional systems Geothermics (IF 3.9) Pub Date : 2024-03-15 Jérémy Godinaud, Philippe Loubet, Sandrine Gombert-Courvoisier, Alexandre Pryet, Alain Dupuy, François Larroque
This paper presents a Life Cycle Assessment (LCA) of a low-power capacity Aquifer Thermal Energy Storage (ATES) system supplying a building on Bordeaux INP’s university campus, powered by the French low-carbon electricity mix. It compares environmental impacts with alternative thermal energy supply solutions, analyzing various scenarios including design choices, construction methods, equipment lifespan
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Geochemical and microbial processes in a deep geothermal well during seven years of production stop and their potential impact on the well performance Geothermics (IF 3.9) Pub Date : 2024-03-14 Simona Regenspurg, Guido Blöcher, Danae Bregnard, Vera Hehn, Ernst Huenges, Pilar Junier, Katrin Kieling, Christian Kluge, Stefan Kranz, Alessio Leins, Andrea Vieth-Hillebrand, Thomas Wiersberg, Martin Zimmer
Reusing deep wells whether from oil- and gas or geothermal energy production, after years of inactivity can be economically beneficial for the geothermal industry. This study examines the processes that occur in an abandoned well and their impact on reservoir performance.
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Demonstration of a successful soft chemical stimulation in a geothermal sandstone reservoir in Mezőberény (Hungary) Geothermics (IF 3.9) Pub Date : 2024-03-12 Maren Brehme, Ábel Markó, Máté Osvald, Günter Zimmermann, Wolfgang Weinzierl, Santiago Aldaz, Stefan Thiem, Ernst Huenges
Geothermal energy projects often lack sufficient permeability for a sustainable operation. If natural permeability is low, it can be enhanced by stimulation treatments. These can be of thermal, hydraulic or chemical nature. The challenge is to stimulate the reservoir successfully and at the same time to do it in an environmentally safe way. This is called soft stimulation and was extensively tested
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Experimental study on reinjection enhancement of sandstone with radial wells Geothermics (IF 3.9) Pub Date : 2024-03-12 Chao Yu, Kang Cheng, Zhongwei Huang, Jingbin Li, Jingru Hu, Dong Yang, Rui Li
Geothermal resources are abundant and can be vigorously developed. Vertical well reinjection is widely used in sandstone geothermal resources, but the efficiency is low due to near-well blockage. There is a lack of existing measures to improve reinjection efficiency. For sandstone reservoirs, a new method using radial well technology is proposed to enhance reinjection efficiency. Firstly, based on
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Sequentially optimized data acquisition for a geothermal reservoir Geothermics (IF 3.9) Pub Date : 2024-03-11 Anthony Corso, Maria Chiotoroiu, Torsten Clemens, Markus Zechner, Mykel J. Kochenderfer
Given the high energy demands for heating and cooling, and the currently limited use of renewable sources, there is a pressing need for efficient and economically viable geothermal development. However, the success of new geothermal reservoir projects hinges on numerous uncertain geological and economic factors. Prior to development, the project uncertainty can be reduced by performing costly data
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Variability in surface CO2 flux: Implication for monitoring surface emission from geothermal fields Geothermics (IF 3.9) Pub Date : 2024-03-08 Tsung-Han Jimmy Yang, Isabelle Chambefort, Michael Rowe, Agnes Mazot, Anya Seward, Cynthia Werner, Tobias Fischer, Jun Seastres, Farrell Siega, Nick Macdonald, Thomas Brakenrig, Lauren Coup, Fiona Sander
In the last decade the international push for the development of various renewable energy and the increase of the carbon tax for emitters, has put high enthalpy geothermal on a hot seat. Anthropic geothermal emissions in volcanic areas are not negligible due to the inherent nature of their volcanic setting but are counted regardless, similarly to a gas or coal power plant, despite their non-fossil
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Deciphering the Way Ratai geothermal system, Lampung, Indonesia: A comprehensive geochemical and isotopic analysis Geothermics (IF 3.9) Pub Date : 2024-03-06 Mochamad Iqbal, Brenda Ariesty Kusumasari
This study investigates the geochemistry and isotopic characteristics of geothermal manifestations in the Way Ratai geothermal field, Lampung, Indonesia, to elucidate the system's fluid flow, reservoir temperature, and the origins of its thermal waters. Fourteen samples were collected from Way Ratai, with three additional from Jatimulyo and four from Natar. The major ion contents and stable isotope
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Optimized allocation of water temperature, quality, and quantity for the utilization of geothermal water from deep buried reservoirs Geothermics (IF 3.9) Pub Date : 2024-03-03 Xinyi Wang, Xiaoying Yuan, Qingna Shui, Yufeng Qi, Xiaoying Deng, Fang Yang
There is a need to fully utilize the benefits of geothermal water, while avoiding environmental problems in the development process. In this study, the water level, quantity, quality, and temperature of three sub-thermal reservoirs in Kaifeng City urban area, with burial depths of 1600−1800, 1800−2000, and 2000−2200 m, were combined with the local water demand and the actual exploitation and recharge
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Experimental investigation on the use of PCM heat exchangers in Geo-energy piles and walls Geothermics (IF 3.9) Pub Date : 2024-03-02 Omar Elkezza, Musab Alhawat, Mostafa Mohamed, Amir Khan
The current paper aims to experimentally investigate the thermal performance of geo-energy piles and walls fabricated with Phase Change heat exchangers. Four prototype concrete geo-energy structures (i.e., piles and walls) were tested using two distinct types of heat exchangers, including standard heat exchangers and PCM heat exchangers. The PCM heat exchangers utilized in the current study were filled
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Development and application of a geothermal bio-tracer resistant to extreme environments Geothermics (IF 3.9) Pub Date : 2024-03-02 Kai-Chun Fan, Pei-Jyuan Gao, Bo-Han Chen, Yin-Lung Han, Chieh-Lun Cheng
Tracers are key to acquiring data on fluid transport behavior and hydrological parameters. In particular, in the harnessing of geothermal energy, it is used to determine the connections between production and injection wells, the hydrological parameters of geothermal reservoirs, and the efficiency of thermal recovery. Traditional tracers are expensive and may pollute the environment. In response to
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Experimental study on hydraulic and mechanical properties of fault rock under the thermal-hydraulic-mechanical coupling Geothermics (IF 3.9) Pub Date : 2024-03-01 Wentao Hou, Dan Ma, Xianwei Liu, Jixiong Zhang
The exploitation of hydrothermal geothermal resources (HGR) in fault zone is one of the most promising technical schemes for geothermal energy development. To understand the hydraulic and mechanical behaviors of rock mass in fault zone, a series of thermal-hydraulic-mechanical (THM) coupling tests of fault rocks were conducted, and the influence of the fault gouge content, water temperature, seepage
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Lithium-rich basement brines: Activity versus concentration geothermometry Geothermics (IF 3.9) Pub Date : 2024-03-01 Tiziano Boschetti, Emma Salvioli-Mariani, Lorenzo Toscani
Lithium-rich brine plays a crucial role in the energy transition. Specifically, geothermal Upper Rhine Graben brines and the fluid inclusions in the adjacent southwesternmost Black Forest (Germany) are lithium-rich due to their interactions with Variscan basement rocks (granite and gneiss). Given their high salinity, however, conventional empirical geothermometers may prove inadequate, as these rely
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Deep-time temperature field simulation of hot dry rock: A deep learning method in both time and space dimensions Geothermics (IF 3.9) Pub Date : 2024-03-01 Wanli Gao, Jingtao Zhao
Hot dry rock has emerged as a crucial renewable resource with a potential to provide significant energy to China. Accurately simulating the temperature field of hot dry rocks in space is essential in estimating their reserves. Moreover, predicting the temperature change curve of hot dry rocks over time is crucial for research in the field. Although these tasks are interrelated and share a common ground
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A critical evaluation of the role of a geothermal system in lithium enrichment of brines in the salt flats: A case study from Laguna Verde in the Atacama Region of Chile Geothermics (IF 3.9) Pub Date : 2024-03-01 Mohammad Ayaz Alam, Adolfo Muñoz
The association between geothermal fluids and lithium-rich brines in salt flats has been evaluated in a unique natural laboratory in the Chilean Andes. The area encompasses Laguna Verde (LV), a hypersaline lake, and a salt flat () within a closed basin surrounded by volcanoes. The predominant lithology consists of andesitic-dacitic rocks, with limited occurrences of rhyolitic rocks. The LV geothermal
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Atlas of lithium geothermal fluids in Europe Geothermics (IF 3.9) Pub Date : 2024-03-01 Blandine Gourcerol, Bernard Sanjuan, Romain Millot, Detlev Rettenmaier, Elodie Jeandel, Albert Genter, Clio Bosia, Aurélien Rombaut
In the last decade, lithium has become a strategic metal leading several European countries to assess their Li-resources. For the first time, a geochemical characterization and assessment of identified Li-rich deep fluids in Europe has been conducted. A total of 182 occurrences have been identified. Geostatistical study suggests that the highest Li concentration values (i.e. 250–480 mg/l) are strongly
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Experimental study of mechanical properties of hot dry granite under thermal-mechanical couplings Geothermics (IF 3.9) Pub Date : 2024-03-01 Kaixuan Wang, Zaobao Liu, Ming Wu, Chuan Wang, Wanqing Shen, Jianfu Shao
The investigation of the mechanical properties of hot dry rock (HDR) is of great significance to the development of deep geothermal energy. However, the effects of thermal-mechanical couplings on the mechanical characteristics of deep HDR are currently unclear. This study investigates the mechanical behavior of deep HDR through real-time high-temperature triaxial compression experiments. The paper
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Experimental and numerical simulation research on hot dry rock wellbore stability under different cooling methods Geothermics (IF 3.9) Pub Date : 2024-03-01 Yu Suo, Muyu Dong, Xiaofei Fu, Wenyuan He, Zhejun Pan
The exploitation of geothermal energy commonly occurs at depths ranging from 3000 to 10000 m. At these depths, the surrounding rocks experience substantial temperature and pressure, leading to alterations in their physical and mechanical properties. The infiltration of drilling fluid into the wellbore result in thermal exchange with the surrounding rocks, causing a decrease in their strength and stability
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Potential for CO2 plume geothermal and CO2 storage in an onshore Red Sea Rift basin, Al-Wajj, Saudi Arabia: 3D reservoir modeling and simulations Geothermics (IF 3.9) Pub Date : 2024-02-29 Bora Yalcin, Justin Ezekiel, P. Martin Mai
Using supercritical instead of water for geothermal energy extraction offers advantages while enabling sequestration. The integration of capture, utilization, and storage (CCUS) in geothermal reservoirs aligns with circular carbon economy models and supports the goals of sustainable energy development. The geothermal potential of deep saline aquifers, like in the young and high-heat-flux Red Sea rift
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The effect of turbulator holes diameter on heat transfer optimization of a geothermal heat exchanger by using nanofluid Geothermics (IF 3.9) Pub Date : 2024-02-28 Saeed Alqaed, Jawed Mustafa, S. Mohammad Sajadi, Fahad Awjah Almehmadi, Mohsen Sharifpur
This paper numerically investigates the effect of using some turbulators in a geothermal heat exchanger with the optimal arrangement. The geothermal heat exchanger includes a constant-temperature tube through which the nanofluid flow with Cu nanoparticles passes. In the geothermal heat exchanger, five conical turbulators are used on which there are some holes. By changing the radius of holes on turbulators
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Temperature driven real-time weakening and strengthening mechanisms of unconfined granite Geothermics (IF 3.9) Pub Date : 2024-02-28 Fei Wang, Rui Pang, Heinz Konietzky, Ke Hu, Ben-Guo He, De-Hao Meng, Mohamed Ismael
The distinctive mechanical behaviors exhibited by granite under real-time temperature (RT) and after thermal treatment (AT) highlight a challenge in directly observing real-time cracking phenomena in RT granite within a laboratory setting. To overcome this limitation, a thermo-mechanical coupled grain-based model (GBM) was introduced for numerical investigations. The simulation outcomes reveal that
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Geothermal Energy Extraction Using a Novel Combined Coaxial and U-Shaped Closed-Loop System Geothermics (IF 3.9) Pub Date : 2024-02-26 Srinivas Chappidi, Ankesh Kumar, Jogender Singh
In the present study, a novel combined coaxial and U-shaped closed-loop system was proposed to enhance the thermal performance of the U-shaped geothermal system. The proposed geothermal system consists of two separate energy extraction units, called primary and secondary systems. The primary system consists of an insulated U-shaped tube heat exchanger. In order to extract more thermal energy, a coaxial
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Temperature description and heat extraction optimization of enhanced geothermal system via failure volume ratio Geothermics (IF 3.9) Pub Date : 2024-02-25 Weiwu Ma, Jiangzirui Xu, N.M.S. Hassan, Chong Yang, Yifan Xu, Tao Feng, Gang Liu
It is difficult to quantitatively measure the temperature characteristics to evaluate the heat extraction in Enhanced Geothermal Systems (EGS). This study aims to define a new evaluation index called failure volume ratio to describe the temperature distribution in rocks and optimize heat extraction. In the established three-dimensional thermal-hydrologic coupling model, the cumulative heat production
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Investigation on the influence of mixed borehole depths in vertical ground heat exchanger systems Geothermics (IF 3.9) Pub Date : 2024-02-24 Ahmad Aljabr
Most studies about vertical borehole heat exchangers (BHEs) tended to focus on optimizing total borehole length with all boreholes having the same depth. This is mainly because most of the vertical BHEs design tools do not have the feature of designing mixed borehole depths at the same bore field. Because thermal saturation occurs over time at the center of the field due to thermal interaction between
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On the use of an underground storage tank for disposing bleed water in standing column well systems Geothermics (IF 3.9) Pub Date : 2024-02-24 Mohamed Arbi Ben Aoun, Philippe Pasquier, Alain Nguyen
A standing column well is a groundwater-coupled heat pump system used for household and commercial space heating and cooling. During off-peak periods, groundwater is pumped from the well to a heat exchanger before being returned to the same well. During high-demand periods, a fraction of the outlet water is returned to the aquifer using an injection well. This operation strategy increases the thermal
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Optimizing geothermal reservoir modeling: A unified bayesian PSO and BiGRU approach for precise history matching under uncertainty Geothermics (IF 3.9) Pub Date : 2024-02-21 Jar Ullah, Huan Li, Pantelis Soupios, Muhsan Ehsan
This research focuses on optimizing geothermal reservoir modeling tackling issues related to non-uniqueness, subsurface uncertainties, and computational intensity. The proposed workflow integrates Bayesian Particle Swarm Optimization (PSO) and a Bidirectional Gated Recurrent Unit (BiGRU) network to enhance the efficiency of history matching in the context of geothermal resource development under uncertainties
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Distribution of excellent sandstone reservoir and migration of geothermal water in Neogene formations of Guanzhong Basin Geothermics (IF 3.9) Pub Date : 2024-02-19 Lu Luo, Chenbingjie Wu, Nanan Gao, Xiang Mao
The Guanzhong Basin is a Neogene faulted basin with rich geothermal resources . The faults are well developed, and the EW and NNE trending faults have better water conductivity. The main sandstone reservoirs, from young to old, include the Zhangjiapo Formation, the Lantian Bahe Formation, and the Gaoling Formation. This study focuses on the distribution of high-quality sand bodies in the Neogene sandstone
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Maximizing permeability of fractured volcanic rocks through chelating-agent-assisted and pH-controlled selective mineral dissolution Geothermics (IF 3.9) Pub Date : 2024-02-18 Luis Salalá, Jonathan Argueta, Jiajie Wang, Noriaki Watanabe, Noriyoshi Tsuchiya
Chemical stimulation of geothermal reservoirs through mineral dissolution using environmentally friendly chelating agents has been suggested as a new method to complement hydraulic stimulation. However, the permeability enhancement mechanism and optimal pH remain unexplored. In this study, we conducted flooding experiments on a fractured andesitic rock at 200 °C using 20 wt% -bis(carboxymethyl)--glutamic
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Investigation on rock-breaking and debris flow of high-pressure CO2 jet drilling using discrete element methods (DEM) Geothermics (IF 3.9) Pub Date : 2024-02-17 Can Cai, Quangong Xie, Yulong Zhao, Haitao Ren, Chen Chen, Kangkang Fan, Daping Xu, Wen-Yang Cao, Liehui Zhang, Hao Chen, Xianpeng Yang
To address the low efficiency and severe thermal wear of drill bits in geothermal drilling, CO (carbon dioxide) jet drilling as a new method is proposed. However, the rock-breaking and debris flow of composite rock-breaking of high-pressure CO&PDC cutter in CO jet drilling are crucial problems and remain unclear. Therefore, we established a discrete element model of composite rock-breaking, validated
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Lithium: An energy transition element, its role in the future energy demand and carbon emissions mitigation strategy Geothermics (IF 3.9) Pub Date : 2024-02-17 Dornadula Chandrasekharam, M. Furkan Şener, Yaşar K. Recepoğlu, Tugba Isık, Mustafa M. Demir, Alper Baba
Energy transition elements (Li, Ni, Co, Fe, Cu) are gaining importance due to their ability to provide energy and play an important role as primary energy sources. Because of the energy density and power density, Li-ion batteries have the edge over other batteries. Li is distributed in various rock-forming minerals and brines, and geothermal waters. Though lithium-bearing minerals are spread over a
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Using thermal response factors with time dependent thermal properties Geothermics (IF 3.9) Pub Date : 2024-02-17 Stephan Düber, Raul Fuentes, Guillermo A. Narsilio
This paper presents a simple and fast methodology to consider changing thermal properties in, for example, the design of shallow geothermal systems, by using thermal response factors. The simulation period is split into multiple sections according to the changes in thermal properties. By transforming the temperature response from one section to the next and subsequent superposition, any changes in
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Geothermal energy potential in relation to black carbon reduction and CO2 mitigation of Himalayan geothermal belt – A review Geothermics (IF 3.9) Pub Date : 2024-02-17 Hemant Kumar Singh, D. Chandrasekharam, N.J. Raju, Shyam Ranjan
We have compiled geochemical dataset of springs (Thermal and Cold) from the Himalayan Geothermal Belt (HGB), shows slightly acidic to moderately alkaline (pH = 4.5 – 9.4) in nature with an emerging surface temperature of 27 °C – 96 °C. The calculated reservoir temperature ranged in between 78 °C – 159 °C categorize the HGB as a low- to a moderate-enthalpy geothermal system. It was observed that geochemical
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A geophysical assessment of the Termas de Río Valdez geothermal area (Tierra del Fuego, Argentina) Geothermics (IF 3.9) Pub Date : 2024-02-16 Jorge G. Lozano, Donaldo M. Bran, Sebastian Ramirez, Florencia B. Restelli, Stefania Bunicontro, Federico Esteban, Marco Menichetti, Emanuele Lodolo, Alberto Renzulli, Juan F. Vilas, Alejandro Tassone
The Termas de Río Valdez is a low-enthalpy geothermal area located in the southernmost South America, Argentina. The area is characterized by a geologic history of changing tectonic regimes that resulted in superimposed structures. The mechanism and pathway for fluid migration of the thermal springs remains uncertain. A geophysical survey of electrical resistivity tomography profiles combined with
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Heat transfer characteristics of external finned backfill coupled heat exchanger in mine Geothermics (IF 3.9) Pub Date : 2024-02-16 Yujiao Zhao, Xueying Lu, Lang Liu, Bo Zhang, Mengyao Wang, Hailong Zhang
There are abundant geothermal resources in mine goaf. The effective exploitation of geothermal energy is of great significance to realize the long-term sustainable development of mines. In this paper, a three-dimensional unsteady heat transfer model of a typical serpentine backfill coupled heat exchanger is established using COMSOL Multiphysics simulation software, and the accuracy of the model is
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Circulation experiments at Utah FORGE: Near-surface seismic monitoring reveals fracture growth after shut-in Geothermics (IF 3.9) Pub Date : 2024-02-15 Peter Niemz, John McLennan, Kristine L. Pankow, James Rutledge, Kevin England
Enhanced geothermal systems (EGS) play a crucial role in the shift from fossil to renewable energy. The Utah Frontier Observatory for Research in Geothermal Energy (FORGE) is a large-scale experimental EGS that aims to overcome setbacks faced by EGS projects, such as economic viability and concerns about induced seismic activity, by studying new tools and strategies. Four circulation experiments were
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Numerical modeling of the CO2 injection in the Kızıldere geothermal field using multiple inter-well tracer tests Geothermics (IF 3.9) Pub Date : 2024-02-15 Doguhan Barlas Sevindik, Selcuk Erol, Serhat Akin
Many geothermal power plants in Turkey emit high amounts of non-condensable gas (NCG), consisting mainly of CO. Thus, it is crucial to mitigate the NCG emissions by re-injecting the captured gas back into the reservoir. In this study, a numerical sector reservoir model is developed to inspect how the reinjected NCG dissipates in the reservoir for successful sequestration. To accurately characterize
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Corrigendum to ‘Assessment of the theoretical models of effective thermal conductivity based on digital rock physics for clean sandstones’ [Geothermics 114 (2023) 102803] Geothermics (IF 3.9) Pub Date : 2024-02-13 Reza Najafi-Silab, Shahin Kord, Aboozar Soleymanzadeh, Ali Reza Khaz'ali