Article
Geochemistry & Geophysics
Taeho Kim, Jean-Philippe Avouac
Summary: Induced seismicity during Enhanced Geothermal Stimulation in Otaniemi, Finland was modeled using statistical and physical approaches. The physical model, assuming rate-and-state friction, produced simulations closest to the observations, highlighting the importance of a time-dependent earthquake nucleation process in reproducing the spatial pattern of seismicity. A statistical model, estimating seismicity rate based on convolution of the injection history with a kernel approximating earthquake triggering by fluid diffusion, also fit the observations well and had superior computational efficiency. The Kaiser effect, however, was not clearly observed in the data from Otaniemi.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geosciences, Multidisciplinary
Anne Obermann, Sin-Mei Wu, Thorbjorg Agustsdottir, Alejandro Duran, Tobias Diehl, Pilar Sanchez-Pastor, Sigridur Kristjansdottir, Vala Hjorleifsdottir, Stefan Wiemer, Gylfi Pall Hersir
Summary: In this study, we investigate the shallow crustal structures and seismicity patterns in the Hengill high-enthalpy geothermal area in SW Iceland. Our results show that seismicity in the area is clustered and associated with injection and production activities. Furthermore, we analyze the spatial distribution of rock properties and geophysical anomalies.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geochemistry & Geophysics
J. M. Holmgren, G. Kwiatek, M. J. Werner
Summary: The rupture behavior of microseismicity in fluid-injection settings is influenced by pore pressure and shows a certain degree of predictability. Through the analysis of directivity patterns and focal mechanisms, this study identifies rupture planes and directions of 10 events recorded during the 2018 St1 Deep Heat geothermal project in Finland. Unlike previous studies, the events in this project exhibit varied rupture directions, with some rupturing towards, away from, or parallel to the injection well. These findings contribute to the understanding of rupture growth in pore-pressure dominated settings.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Letter
Geosciences, Multidisciplinary
Faiz Muttaqy, Andri Dian Nugraha, Nanang T. Puspito, David P. Sahara, Zulfakriza Zulfakriza, Supriyanto Rohadi, Pepen Supendi
Summary: This study aims to determine precise earthquake locations and analyze the pattern of seismic distribution in Central and East Java, Indonesia. The results show that the seismic activity in the region is predominantly distributed in the south of Java Island, possibly due to subduction activity. There are also clusters of earthquakes with shallow depths on the mainland, indicating the activity of inland faults.
GEOSCIENCE LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Kai Zhao, Xiaoyun Wang, Yongcun Feng, Wei Gao, Wenjie Song, Liangbin Dou, Hailong Jiang
Summary: Due to the complexity of the fault activation mechanism in hot dry rock injection and production, a thermal-hydraulic-mechanical coupling mathematical model is established to evaluate the fault activation risk. The results show that the risk of fault activation increases with greater well spacing and injection flow, and with lower reservoir permeability and higher initial reservoir temperature. Different fault occurrences lead to different risks of fault activation. These findings are important for the safe and efficient development of hot dry rock reservoirs.
Article
Geosciences, Multidisciplinary
Bing Q. Li, Mostafa Khoshmanesh, Jean-Philippe Avouac
Summary: The study found that injection of cold water and production are the primary factors influencing seismic activity in the Raft River geothermal field, located predominantly in the basement. By using a hydro-mechanical model, it was determined that production from deeper reservoirs has minimal impact on seismic activity.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Energy & Fuels
Wenzhuo Cao, Sevket Durucan, Ji-Quan Shi, Wu Cai, Anna Korre, Thomas Ratouis
Summary: The temperature of reinjected fluids at the Hellisheioi geothermal field in Iceland was found to be inversely correlated with field injectivity and induced seismicity. A 3D coupled THM model was developed to investigate the mechanisms of induced seismicity, and it was found that permeability enhancement is the dominant mechanism. Additionally, reducing the temperature of reinjected fluids can significantly increase the amount of heat transferred and mitigate the risk of injection-induced seismicity.
Article
Engineering, Geological
Chuanyin Jiang, Xiaoguang Wang, Fengshou Zhang, Kai Deng, Qinghua Lei
Summary: This study investigates the impact of in situ stresses, injection pressure, and temperature on fracture activation and induced seismicity in fractured geothermal reservoirs. The results reveal that the in situ stress state plays a fundamental role in controlling seismicity occurrence, while injection-induced fluid pressurization and thermal perturbation act as triggering factors. Seismic events mainly occur near the injection well and along the main streamlines of fluid flow. Additionally, the injection pressure and temperature strongly affect the long-term thermal energy output of the reservoir.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Geochemistry & Geophysics
Ryan Haagenson, Harihar Rajaram
Summary: The propagation of seismic activity may be faster than the effective hydraulic diffusivity, particularly in heterogeneous media. Seismic diffusivity and effective hydraulic diffusivity may be higher by an order of magnitude or more.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Maria Mesimeri, Kristine L. Pankow, Ben Baker, J. Mark Hale
Summary: Research identified over 1,000 earthquakes occurring in the Mineral Mountains, Utah between 2016 and 2019, with seismic activity concentrated in a narrow zone possibly driven by fluid migration. Multiple periods of swarm-like activity were observed, with complex mechanisms including fluid diffusion and aseismic slip responsible for the earthquake swarm evolution.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
Philip Hering, Michael Lindenfeld, Georg Ruempker
Summary: The surveillance of geothermal seismicity using seismic arrays is less affected by noise interference than seismic networks, which are often deployed in urban areas. However, the effectiveness of arrays in monitoring geothermal reservoirs and accurately localizing earthquakes is not well studied. This study proposes a time-domain array data processing method using robust linear regression and statistical analysis to improve the accuracy of earthquake localizations.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geochemistry & Geophysics
Chengping Chai, Jonas Kintner, Kenneth M. Cleveland, Jingyi Luo, Monica Maceira, Charles J. Ammon
Summary: This article presents an automated approach using machine learning algorithms for processing quality control screening of surface-wave seismograms. By training logistic regression, support vector machines, K-nearest neighbors, random forests, and artificial neural networks with nearly 400,000 human-labeled waveforms, the authors developed two best-performing models, specifically the ANN and RF models. Testing results showed that these models agreed with labels from human analysts for seismic events in geographic regions not used for training, while requiring only 0.4% of the time. These automated processing methods can effectively reduce outliers in surface-wave-related measurements.
SEISMOLOGICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Ali Khansefid, Seyed Mahmoudreza Yadollahi, Gerhard Mueller, Francesca Taddei
Summary: This study statistically evaluated induced earthquakes by geothermal power plants and developed a probabilistic model for simulating stochastic seismic events. The model provides a tool for assessing seismic risk in built environments prone to induced seismicity caused by geothermal power plant operation, which is valuable for engineers and scientists.
INTERNATIONAL JOURNAL OF DISASTER RISK SCIENCE
(2022)
Article
Multidisciplinary Sciences
Ryan Schultz, William L. Ellsworth, Gregory C. Beroza
Summary: This study examines how induced seismicity stops and finds that Bath's law, which predicts the difference in magnitudes based on population count ratio, applies to induced seismicity. The study also reveals that count ratios in induced seismicity follow a skewed and heavy-tailed distribution, with most earthquakes occurring during stimulation/injection.
SCIENTIFIC REPORTS
(2022)
Article
Energy & Fuels
Sabrina Keil, Joachim Wassermann, Tobias Megies
Summary: In this study, moderate seismicity appeared around five years after the beginning of geothermal circulation in a site east of Munich. By performing 3D seismic simulations, the possible seismic impact in the area can be estimated and used to improve the seismic monitoring network.
Article
Engineering, Environmental
I. Bouzid, D. Pino Herrera, M. Dierick, Y. Pechaud, V. Langlois, P. Y. Klein, J. Albaric, N. Fatin-Rouge
Summary: The foam-based method for delivering Fenton reagents and bacteria has been shown to be effective in the in situ remediation of petroleum hydrocarbon-contaminated areas. Despite a longer duration compared to direct injection, this method offers advantages such as controlled delivery of reactive solutions and reduced consumption of reagents.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Geosciences, Multidisciplinary
Alma Dzozlic Bradaric, Trond Andersen, Isabelle Lecomte, Helge Loseth, Christian Haug Eide
Summary: This study shows that despite being below seismic resolution, small-scale sand injectites can be detected in seismic data. The detection is more likely if the injectites have high thickness, steep dip, and dense spacing. The presence of sand injectites also decreases the top reservoir amplitude. Comparisons between synthetic seismic images and real data indicate that low-amplitude anomalies observed above the reservoir may be caused by overlying sand injectites. Additionally, the study suggests that the Grane Field hosts thicker and more distant sand injectites than what well observations indicate.
JOURNAL OF THE GEOLOGICAL SOCIETY
(2022)
Article
Geosciences, Multidisciplinary
T. Volatili, F. Agosta, N. Cardozo, M. Zambrano, I Lecomte, E. Tondi
Summary: This study investigates the footwall damage zone of a seismic-scale normal fault and assesses the seismic signature of the damage zone through modeling and seismic simulations, revealing the potential impact of subsidiary faults in seismic imaging.
JOURNAL OF STRUCTURAL GEOLOGY
(2022)
Article
Geochemistry & Geophysics
Sven Peter Nasholm, Kamran Iranpour, Andreas Wuestefeld, Ben D. E. Dando, Alan F. Baird, Volker Oye
Summary: Distributed Acoustic Sensing (DAS) involves the transmission of laser pulses along a fiber-optic cable, measuring strain through backscattered pulses. DAS has differences from conventional sensors but has the potential for array processing algorithms.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Green & Sustainable Science & Technology
Joonsang Park, Luke Griffiths, Jeremie Dautriat, Lars Grande, Ismael Vera Rodriguez, Kamran Iranpour, Tore I. Bjornara, Hector Marin Moreno, Nazmul Haque Mondol, Guillaume Sauvin, Joel Sarout, Magnus Soldal, Volker Oye, David N. Dewhurst, Jung Chan Choi, Angus Ian Best
Summary: The aim of the current study is to evaluate the feasibility of micro-seismic monitoring of CO2 injection into storage candidates in the North Sea. The experiment results show that different depth groups may behave differently in response to CO2 injection, and lithology plays an important role in micro-seismic response. Numerical simulations and synthetic data analysis provide insights into fracture propagation and micro-seismic activity in subsurface.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2022)
Article
Multidisciplinary Sciences
Volker Oye, Sergey Stanchits, Oladipupo Babarinde, Robert Bauer, Anna Maria Dichiarante, Nadege Langet, Bettina Goertz-Allmann, Scott Frailey
Summary: To study the mechanism of fluid-induced seismicity, a large-scale laboratory experiment was conducted and compared with field-scale observations. It was found that the existence of fluid pathways plays a decisive role in the potential of induced seismicity.
SCIENTIFIC REPORTS
(2022)
Article
Geosciences, Multidisciplinary
Federica Ghione, Steffen Maeland, Abdelghani Meslem, Volker Oye
Summary: This paper describes a new concept to automatically characterize building types in urban areas based on publicly available image databases, making parts of seismic risk assessment more time and cost-effective, and improving the reliability of seismic risk assessment, especially in regions where building stock information is currently not documented. The study successfully classified and defined the building stock in Oslo, Norway using a Convolutional Neural Network, demonstrating the significant contribution of CNNs in developing a cost-effective building stock model.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Oladipupo Babarinde, Sergey Stanchits, Robert Bauer, Scott Frailey, Volker Oye, Dustin Sweet
Summary: In this study, a large-scale triaxial block experiment was conducted on Castlegate Sandstone to investigate the mechanisms causing microseismicity at a CO2 injection site. The experiment revealed that the crushing and flattening of fault surfaces were correlated with the spatiotemporal distribution of microseismic events near the fault. The presence of thicker fault gouge and smaller grain size in areas with wider aperture suggests a link between fault characteristics and microseismic activity.
JOURNAL OF STRUCTURAL GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Thea Sveva Faleide, Alvar Braathen, Isabelle Lecomte, Ingrid Anell
Summary: This study explores detection and resolution thresholds in seismic imaging and the manifestation of different geological features in seismic signals. The results show that faults with damage zones exhibit noticeable disturbances in seismic signals, while fractures filled with CO2 display stronger amplitudes. Additionally, the study finds that good imaging results can be achieved with appropriate illumination angles.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geochemistry & Geophysics
Annie Elisabeth Jerkins, Andreas Kohler, Volker Oye
Summary: Detecting and locating seismic activity in the North Sea is crucial for the safety of future CO2 storage operations. The current one-sided network configuration limits the event location capabilities, but applying array processing techniques to offshore sensors at oil and gas reservoirs can improve the signal-to-noise ratio and enhance earthquake event locations. The use of continuous data from 30 sensors is recommended for optimal detection.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Zoya Zarifi, Andreas Koehler, Philip Ringrose, Lars Ottemoeller, Anne-Kari Furre, Fredrik Hansteen, Annie Jerkins, Volker Oye, Roya Dehghan Niri, Roger Bakke
Summary: Prior to the CO2 injection in the Horda platform offshore western Norway, the Horda Network project conducted measures to assess seismic hazards. The study confirmed the dominant directions of stress and observed moderate seismicity in the region. However, the lack of coverage from onshore seismic stations hinders offshore earthquake monitoring.
SEISMOLOGICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Ismael Vera Rodriguez, Marius P. Isken, Torsten Dahm, Oliver D. Lamb, Sin-Mei Wu, Sigridur Kristjansdottir, Kristin Jonsdottir, Pilar Sanchez-Pastor, John Clinton, Christopher Wollin, Alan F. Baird, Andreas Wuestefeld, Beat Booz, Eva P. S. Eibl, Sebastian Heimann, Bettina P. Goertz-Allmann, Philippe Jousset, Volker Oye, Vala Hjorleifsdottir, Anne Obermann
Summary: This work presents a study on the acoustic signals of a meteoroid in Iceland using large-N seismic and distributed acoustic sensing (DAS) observations. The dense data set allows for the identification of acoustic phases that are difficult to discriminate on sparser networks. With the trajectory parameters of one fragment estimated through a Bayesian inversion model, the meteoroid is classified as a slow meteoroid of asteroidal origin with an estimated energy of 4-40 GJ and a probable size on the order of centimeters, consistent with the main asteroid belt.
SEISMOLOGICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Robin Andre Rorstadbotnen, Jo Eidsvik, Lea Bouffaut, Martin Landro, John Potter, Kittinat Taweesintananon, Stale Johansen, Frode Storevik, Joacim Jacobsen, Olaf Schjelderup, Susann Wienecke, Tor Arne Johansen, Bent Ole Ruud, Andreas Wuestefeld, Volker Oye
Summary: Climate change is affecting the Arctic at a faster rate than anywhere else, leading to rapid changes in ecosystems. This will cause shifts in whale migration and habitat use that will coincide with changes in human activities. To effectively manage and conserve these species, better monitoring of whale presence and movement is needed in real-time, and this study proposes the use of Distributed Acoustic Sensing (DAS) as a solution.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Geography, Physical
Nadege Langet, Fred Marcus John Silverberg
Summary: A CNN was used to automatically classify 15 years of seismic signals recorded by a geophone network in Norway, identifying eight event classes related to slope movements. About 60,000 events were classified based on spectrogram images, with an estimated classifier performance of around 80%. The results showed a strong seasonality of microseismic activity at the study site, with a clear link between annual temperature variations and activity, while the relationship with groundwater recharge processes could not be demonstrated.
EARTH SURFACE DYNAMICS
(2023)
Article
Energy & Fuels
Luis Salala, Jonathan Argueta, Noel Lopez, Osmany Aparicio, Diana Martinez, Pedro Santos, Arturo Quezada, Oziel Garcia, Jose Erazo, Hiroyuki Yamagishi, Noriyoshi Tsuchiya
Summary: Geothermal systems have significant potential to replace reliance on fossil fuels. El Salvador, being tectonically active, already supplies a significant portion of its electricity demand using volcanic geothermal fields. The study compares different geothermal areas in El Salvador and highlights the controlling factors in the characteristics of geothermal reservoirs.
Article
Energy & Fuels
Lin Jia, Kewen Li, Yun Han, Chi Zhang, Lipeng Zhao
Summary: This study proposes a new approach of retrofitting abandoned oil wells into geothermal wells, and investigates the effects of different parameters on the performance using a numerical model. The results show that the enhanced fracture system significantly improves the efficiency of geothermal energy extraction, and optimal design should control the flow rate and use proppant.
Article
Energy & Fuels
K. H. Kvalsvik, H. Holmberg, R. K. Ramstad, K. Midttomme
Summary: This study proposes a new analytical equation that takes into account the advective heat in fractured rock, improving the accuracy of measuring thermal properties in borehole heat exchangers. The equation is applicable to all thermal response tests and provides a cost-effective alternative to numerical modelling.
Article
Energy & Fuels
Ronald Dipippo
Summary: This paper presents a technique of further preheating the working fluid in geothermal binary plants using extraction turbines, and evaluates the performance at various geofluid temperatures through working equations. The results indicate that this approach can be equally effective in geothermal binary plants as it is in conventional nuclear power plants.
Article
Energy & Fuels
Y. A. Popov, E. M. Chekhonin, E. G. Savelev, D. A. Ostrizhniy, A. B. Shakirov, R. A. Romushkevich, E. A. Babich, B. E. Andreyev, M. Y. Spasennykh, I. A. Sannikova
Summary: This paper describes the results of experimental geothermal studies on the formation surrounding the Savitskaya-300 well in the Volga-Ural oil and gas basin. The study found high thermal heterogeneity and anisotropy in the formation. The paper provides important data on thermal properties and heat flow variations in the well.
Article
Energy & Fuels
Viren Thakore, Hong Wang, Jy-An Wang, Yarom Polsky, Fei Ren
Summary: This paper focuses on the stability of foam-based fracturing fluid under high temperature and high pressure conditions. It is of significant importance for the development of foam fracturing fluid as an alternative to conventional water-based fracturing fluid in Enhanced Geothermal System (EGS). Experimental results show that with the appropriate selection of surfactants and stabilizing agents, stable foams can be obtained. Analytical models are developed to predict the foam stability for different foam compositions, considering the effects of temperature and pressure.
Article
Energy & Fuels
Hong Chang, Sheng Jiang, Haozhi Jiang, Yunjie Li, Zhengheng Gan, Songying Zhao
Summary: This study compared the bearing performance between phase change energy piles (GPEP) and traditional energy piles (TEP) using indoor modeling tests and theoretical formulas. The results showed that GPEP increased the ultimate bearing capacity of a single pile by about 13% compared to TEP. Additionally, the phase change materials effectively restricted the temperature-drag response of energy piles.
Article
Energy & Fuels
Qiang Zhang, Tiago Alves
Summary: This study investigates the influence of salt structures and faults on the geothermal potential in the Cleaver Bank High, Southern North Sea, using high-quality 3D seismic reflection data and bottom-hole temperature data. The results show that salt structures and faults play a significant role in the geothermal gradient, with higher gradients found on the footwalls of faults. Three potential geothermal exploration targets are identified based on the findings.
Article
Energy & Fuels
Hubert Langevin, Nicolo Giordano, Jasmin Raymond, Louis Gosselin, Martin Bourbonnais
Summary: This study evaluates the efficiency and cost of solar-assisted geothermal systems in a subarctic climate, and offers recommendations for optimizing ground heat exchanger configurations.
Article
Energy & Fuels
Lei Chen, Jinchuan Zhang, Longfei Xu, Shijing Chen, Qianchao Li, Yuhang Sun, Jie Li, Xingxu Zhao
Summary: This study assesses the geothermal water circulation process of a granite geothermal system in the Lancang area, Yunnan using water chemistry and isotope analysis techniques. The results show that the geothermal water originates from atmospheric precipitation and the granite pluton serves as the main heat source. Additionally, the fault system plays an important role in the discharge and mixing of hot and cold water.
Review
Energy & Fuels
Md Azhar, Somenath Mondal, Anh Minh Tang, Akhileshwar K. Singh
Summary: Contemporary geotechnical engineering practice involves the design and construction of structures that encounter thermal cycles. Understanding the effect of temperature on soil mechanical properties is challenging, but there have been significant contributions from numerous studies. However, to date, there is no comprehensive review that provides a holistic development of the subject and its connection to field applications.
Article
Energy & Fuels
Mark White, Yaroslav Vasyliv, Koenraad Beckers, Mario Martinez, Paolo Balestra, Carlo Parisi, Chad Augustine, Gabriela Bran-Anleu, Roland Horne, Laura Pauley, Giorgia Bettin, Theron Marshall, Anastasia Bernat
Summary: The study presents a comprehensive numerical modeling of closed-loop geothermal systems (CLGSs) and develops a publicly accessible web application for feasibility studies. The results suggest that competitive levelized cost of heat (LCOH) can be achieved, but significant reductions in drilling costs are required to achieve competitive levelized cost of electricity (LCOE). A site-based case study for multi-lateral systems and the analysis of permeable wet rock are also provided, indicating the potential for improved power production with higher reservoir permeability and temperature.
Article
Energy & Fuels
Xiaoming Tian, Oleg Volkov, Denis Voskov
Summary: In this study, an efficient and flexible adjoint-based framework is proposed for history matching and forecasting geothermal energy extraction. The framework reduces the parameter space using Principal Component Analysis and speeds up the iteration process using the adjoint method. Operator-based linearization is used for efficient calculation and matrix assembly. The framework is demonstrated to be highly efficient for a heterogeneous reservoir with multiple realizations, generating reliable history-matching results.
Article
Energy & Fuels
Asrillah Asrillah, Agus Abdullah, Klaus Bauer, Ben Norden, Charlotte M. Krawczyk
Summary: At the Gross Scho center dot nebeck geothermal research platform in the NE German Basin, the degree and direction of azimuthal velocity anisotropy caused by sub-vertical fracturing were determined through analysis of 3-D seismic reflection data. The observed anisotropy above the Zechstein salt roughly correlates to fault structures formed by an upwelling salt pillow, while below the salt, the less pronounced anisotropy and interpreted fracturing follow the trend of the regional stress field.
Article
Energy & Fuels
Kyosuke Okamoto, Yusuke Mukuhira, Dian Darisma, Hiroshi Asanuma, Hirokazu Moriya
Summary: Microseismic monitoring is crucial in geothermal development, and manual phase picking for seismic data is time-consuming. Existing deep learning phase pickers may face challenges in geothermal fields due to their unique features. This study focuses on developing a specialized deep learning model for local seismic networks in geothermal fields, allowing automatic hypocenter determinations and revealing subsurface fine structures.
