Induced Seismicity Associated With Enhanced Geothermal System

Download Induced Seismicity Associated With Enhanced Geothermal System full books in PDF, epub, and Kindle. Read online Induced Seismicity Associated With Enhanced Geothermal System ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!

Induced Seismicity Associated with Enhanced Geothermal System

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (727 download)

DOWNLOAD NOW!

Book Synopsis Induced Seismicity Associated with Enhanced Geothermal System by :

Download or read book Induced Seismicity Associated with Enhanced Geothermal System written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Enhanced Geothermal Systems (EGS) offer the potential to significantly add to the world energy inventory. As with any development of new technology, some aspects of the technology has been accepted by the general public, but some have not yet been accepted and await further clarification before such acceptance is possible. One of the issues associated with EGS is the role of microseismicity during the creation of the underground reservoir and the subsequent extraction of the energy. The primary objectives of this white paper are to present an up-to-date review of the state of knowledge about induced seismicity during the creation and operation of enhanced geothermal systems, and to point out the gaps in knowledge that if addressed will allow an improved understanding of the mechanisms generating the events as well as serve as a basis to develop successful protocols for monitoring and addressing community issues associated with such induced seismicity. The information was collected though literature searches as well as convening three workshops to gather information from a wide audience. Although microseismicity has been associated with the development of production and injection operations in a variety of geothermal regions, there have been no or few adverse physical effects on the operations or on surrounding communities. Still, there is public concern over the possible amount and magnitude of the seismicity associated with current and future EGS operations. It is pointed out that microseismicity has been successfully dealt with in a variety of non-geothermal as well as geothermal environments. Several case histories are also presented to illustrate a variety of technical and public acceptance issues. It is concluded that EGS Induced seismicity need not pose any threat to the development of geothermal resources if community issues are properly handled. In fact, induced seismicity provides benefits because it can be used as a monitoring tool to understand the effectiveness of the EGS operations and shed light on the mechanics of the reservoir.

Protocol for Addressing Induced Seismicity Associated with Enhanced Geothermal Systems

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (925 download)

DOWNLOAD NOW!

Book Synopsis Protocol for Addressing Induced Seismicity Associated with Enhanced Geothermal Systems by :

Download or read book Protocol for Addressing Induced Seismicity Associated with Enhanced Geothermal Systems written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This Protocol is a living guidance document for geothermal developers, public officials, regulators and the general public that provides a set of general guidelines detailing useful steps to evaluate and manage the effects of induced seismicity related to EGS projects.

Towards the Understanding of Induced Seismicity in Enhanced Geothermal Systems

Author :
Publisher :
ISBN 13 :
Total Pages : 210 pages
Book Rating : 4.:/5 (925 download)

DOWNLOAD NOW!

Book Synopsis Towards the Understanding of Induced Seismicity in Enhanced Geothermal Systems by :

Download or read book Towards the Understanding of Induced Seismicity in Enhanced Geothermal Systems written by and published by . This book was released on 2014 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: This DOE funded project was a collaborative effort between Array Information Technology (AIT), the University of California at Berkeley (UCB), the Helmholtz Centre Potsdam - German Research Center for Geosciences (GFZ) and the Lawrence Berkeley National Laboratory (LBNL). It was also part of the European research project "GEISER", an international collaboration with 11 European partners from six countries including universities, research centers and industry, with the goal to address and mitigate the problems associated with induced seismicity in Enhanced Geothermal Systems (EGS). The goal of the current project was to develop a combination of techniques, which evaluate the relationship between enhanced geothermal operations and the induced stress changes and associated earthquakes throughout the reservoir and the surrounding country rock. The project addressed the following questions: how enhanced geothermal activity changes the local and regional stress field; whether these activities can induce medium sized seismicity M> 3; (if so) how these events are correlated to geothermal activity in space and time; what is the largest possible event and strongest ground motion, and hence the potential hazard associated with these activities. The development of appropriate technology to thoroughly investigate and address these questions required a number of datasets to provide the different physical measurements distributed in space and time. Because such a dataset did not yet exist for an EGS system in the United State, we used current and past data from The Geysers geothermal field in northern California, which has been in operation since the 1960s. The research addressed the need to understand the causal mechanisms of induced seismicity, and demonstrated the advantage of imaging the physical properties and temporal changes of the reservoir. The work helped to model the relationship between injection and production and medium sized magnitude events that have jeopardized, and in some cases suspended, the generation of energy from EGS systems worldwide.

Induced Seismicity Potential in Energy Technologies

Author : Committee on Induced Seismicity Potential in Energy Technologies
Publisher : National Academies Press
ISBN 13 : 0309253683
Total Pages : 238 pages
Book Rating : 4.3/5 (92 download)

DOWNLOAD NOW!

Book Synopsis Induced Seismicity Potential in Energy Technologies by : Committee on Induced Seismicity Potential in Energy Technologies

Download or read book Induced Seismicity Potential in Energy Technologies written by Committee on Induced Seismicity Potential in Energy Technologies and published by National Academies Press. This book was released on 2013-08-28 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past several years, some energy technologies that inject or extract fluid from the Earth, such as oil and gas development and geothermal energy development, have been found or suspected to cause seismic events, drawing heightened public attention. Although only a very small fraction of injection and extraction activities among the hundreds of thousands of energy development sites in the United States have induced seismicity at levels noticeable to the public, understanding the potential for inducing felt seismic events and for limiting their occurrence and impacts is desirable for state and federal agencies, industry, and the public at large. To better understand, limit, and respond to induced seismic events, work is needed to build robust prediction models, to assess potential hazards, and to help relevant agencies coordinate to address them. Induced Seismicity Potential in Energy Technologies identifies gaps in knowledge and research needed to advance the understanding of induced seismicity; identify gaps in induced seismic hazard assessment methodologies and the research to close those gaps; and assess options for steps toward best practices with regard to energy development and induced seismicity potential.

Fluid-Induced Seismicity

Author : Serge A. Shapiro
Publisher : Cambridge University Press
ISBN 13 : 131629806X
Total Pages : 299 pages
Book Rating : 4.3/5 (162 download)

DOWNLOAD NOW!

Book Synopsis Fluid-Induced Seismicity by : Serge A. Shapiro

Download or read book Fluid-Induced Seismicity written by Serge A. Shapiro and published by Cambridge University Press. This book was released on 2015-04-23 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: The characterisation of fluid transport properties of rocks is one of the most important, yet difficult, challenges of reservoir geophysics, but is essential for optimal development of hydrocarbon and geothermal reservoirs. This book provides a quantitative introduction to the underlying physics, application, interpretation, and hazard aspects of fluid-induced seismicity with a particular focus on its spatio-temporal dynamics. It presents many real data examples of microseismic monitoring of hydraulic fracturing at hydrocarbon fields and of stimulations of enhanced geothermal systems. The author also covers introductory aspects of linear elasticity and poroelasticity theory, as well as elements of seismic rock physics and mechanics of earthquakes, enabling readers to develop a comprehensive understanding of the field. Fluid-Induced Seismicity is a valuable reference for researchers and graduate students working in the fields of geophysics, geology, geomechanics and petrophysics, and a practical guide for petroleum geoscientists and engineers working in the energy industry.

Enhanced Geothermal Systems (EGS)

Author : Dornadula Chandrasekharam
Publisher : CRC Press
ISBN 13 : 1000959961
Total Pages : 252 pages
Book Rating : 4.0/5 (9 download)

DOWNLOAD NOW!

Book Synopsis Enhanced Geothermal Systems (EGS) by : Dornadula Chandrasekharam

Download or read book Enhanced Geothermal Systems (EGS) written by Dornadula Chandrasekharam and published by CRC Press. This book was released on 2023-10-02 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Peter Meisen, Past President, Global Energy Network Institute, asked in 1997, “What if there was an existing, viable technology, that when developed to its highest potential could increase everyone’s standard of living, cut fossil fuel demand and the resultant pollution?” After 23 years of sustained effort by the global scientific community, this is becoming a reality. The technology to extract heat from granite has been revolutionized in the last few years. The classical method of creating fracture networks by hydrofracturing is being replaced by a closed-loop method where fluids are not in contact with the hot granite. Supercritical CO2 is replacing water as a circulating fluid. Certainly, the future energy road is going to be led by highly radiogenic granites. While hydrothermal sources are site-specific and have their limitations, EGS can be initiated anywhere on earth. EGS is removing all such obstacles and, in the future, will provide uninterrupted electricity for all. Energy-deficient countries can have surplus electricity; water-stressed countries can have a perennial freshwater supply; and countries can become food-secure and rise above poverty levels. Countries need not depend on energy imports and can independently evolve into carbon neutral or low carbon societies. The contributions made by experts will help researchers and investors to close the energy demand and supply gap in the very near future by tapping the unlimited energy of the Earth. Opportunities available for investors in Turkey are well documented with field, geophysical, and geochemical data and information on the energy generating capacity of the granite intrusive spread over a cumulative area of 6,910 km2 in western Anatolia. With the signing of the Global Geothermal Alliance (GGA) by several countries during the December 2015 CoP 21 (Conference of Parties) summit in Paris, countries are obliged to reduce CO2 emissions by increasing the footprint of renewable energy in the primary source mix. Information provided in this book will lead the way to establishing a clean energy future for millions of people for sustainable development and help to mitigate crises arising due to food, water, and energy shortage issues. Academic and research institutes will benefit to a large extent from the expertise of the top contributors in this book. This information provided in this book will help to lay the foundation for super-hot EGS research in future.

Induced Seismicity in Enhanced Geothermal Systems : Assessment of Thermo-hydro-mechanical Effects

Author : Silvia De Simone
Publisher :
ISBN 13 :
Total Pages : 166 pages
Book Rating : 4.:/5 (112 download)

DOWNLOAD NOW!

Book Synopsis Induced Seismicity in Enhanced Geothermal Systems : Assessment of Thermo-hydro-mechanical Effects by : Silvia De Simone

Download or read book Induced Seismicity in Enhanced Geothermal Systems : Assessment of Thermo-hydro-mechanical Effects written by Silvia De Simone and published by . This book was released on 2017 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Micro-seismicity, and especially felt seismicity, induced by Enhanced Geothermal Systems (EGS) operations is a matter of scientific interest, not only because of the related risks and concerns, but also because the correspondence between injection and seismic activity still remains unclear. The Thesis aims to deepen the understanding of the involved Thermo-Hydro-Mechanical (THM) processes, in order to explain and manage co- and post-injection seismicity. First, we investigate the HM coupling and its effects on pressure response. Fluids injection exerts a force over the aquifer that causes deformation. This implies that Specific Storage, which reflects the capacity of permeable media to deform, cannot be treated as a single parameter, like in classical groundwater hydrology, because deformation also depends on aquifer geometry and on surrounding formations, which constrain displacements. We demonstrate the non-local nature of storage (i.e., its dependence on the poroelastic response over the whole aquifer) by means of analytical solutions to the transient pressure response to injection into one-dimensional and cylindrical finite aquifers, while acknowledging HM coupling. We find that the pressure response is faster and much greater than predicted with traditional solutions. Second, we consider non-isothermal injection and compare the effects of HM and TM couplings. We present analytical expressions for long-term hydraulic and thermal stresses and displacements for unidirectional and radial geometries. To obtain them, we assume steady-state fluid flow and develop an easy-to-use solution to the transient heat transport problem. The solution is then used to illustrate the poroelastic and thermoelastic response and, in particular, the sensitivity of stresses to the outer mechanical boundary conditions. Third, we perform coupled HM and THM simulations of cold water injection in a fault-intact rock system, which allows us to analyze mechanical stability changes during injection in the vicinity of the well. Simulation results show that temperature drop induces a significant perturbation of stresses in the intact rock near the injection well. This perturbation is likely to induce seismicity around critically oriented fractures. HM simulations show that fracture stability depends on the orientation of the faults and on the initial stress tensor. Results show that TM effects dominate and could induce seismicity, when the largest confining stress acts perpendicular to a fracture. Finally, we investigate the mechanisms that may induce seismicity after the end of fluid injection into a deep geothermal system (post-injection seismicity). Apart from the direct impact of fluid pressure increase, we acknowledge thermal effects due to cooling and stress redistribution caused by shear slip along favorably oriented fractures during injection. The effect of these three processes are analyzed both separately and superimposed. We find that post-injection seismicity may occur on unfavorably oriented faults that were originally stable. During injection, such faults become destabilized by thermal and shear slip stress changes, but remain static by the superposition of the stabilizing effect of pressure forces. However, these fractures become unstable and fail when the pressure forcing dissipates shortly after injection stops abruptly, which suggests that a slow reduction in injection rate may alleviate post-injection seismicity.

Mathematical and Computational Modeling of Injection-induced Seismicity

Author : Maryam Alghannam
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (139 download)

DOWNLOAD NOW!

Book Synopsis Mathematical and Computational Modeling of Injection-induced Seismicity by : Maryam Alghannam

Download or read book Mathematical and Computational Modeling of Injection-induced Seismicity written by Maryam Alghannam and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: It has long been recognized that pumping fluids into or out of the Earth has the potential to cause earthquakes. Some of the earliest field evidence dates to the 1960s, when earthquakes were turned on and off by water injection in Rangely, Colorado. More recently, induced seismicity has been reported worldwide in connection with many subsurface technologies, including wastewater disposal, natural gas storage, enhanced geothermal systems, and hydraulic fracturing. As a result, there has been a growing public concern around the world about the potential seismic hazard and environmental impact of subsurface energy technologies. Understanding the physical mechanisms that lead to induced seismicity is essential in efforts to mitigate the risk associated with subsurface operations. As a first step in this thesis, we develop a spring-poroslider model of frictional slip as an analogue for induced seismicity, and analyze conditions for the emergence of stick-slip frictional instability--the mechanism for earthquakes--by carrying out a linear stability analysis and nonlinear simulations. We found that the likelihood of triggering earthquakes depends largely on the rate of increase in pore pressure rather than its magnitude. Thus, the model explains the common observation that abrupt increases in injection rate increase the seismic risk. Second, we perform an energy analysis using the same spring-poroslider model to shed light into the partitioning of energy released into frictional and radiated energy-since the latter is associated with the overall size of the earthquake and its potential for damage to man-made structures. Two key elements of the analysis are: (1) incorporating seismic radiation within the model using a precisely-defined viscous damper, and (2) partitioning the energy supplied by fluid injection into dissipated and stored energy in fluid and skeleton. The analysis shows how the rate of increase in pore pressure controls the radiated energy, stress drop, and total slip of the earthquake. Third, we study the effect of heterogeneity on the dynamics of frictional faults. In particular, we develop an objective (frame-indifferent) formulation of frictional contact between heterogeneous surfaces at a small scale, and introduce the notion that friction is a function of the states of the two surfaces in contact, each representing roughness and microstructural details for the surface. We then conduct dynamic simulations of a spring-slider model and show that heterogeneous Coulomb friction alone is capable of reproducing the transitions in complex frictional behavior, from stable creep to regular earthquakes and slow slip. This thesis, as a whole, enhances our understanding of the mechanics of fluid-injection-induced earthquakes and suggests strategies that mitigate or minimize the seismic risk associated with a wide range of subsurface operations, from hydraulic fracturing and geothermal energy extraction to wastewater injection and geologic CO2 sequestration.

Energy from the Earth

Author : Stefan Hirschberg
Publisher : vdf Hochschulverlag AG
ISBN 13 : 3728136549
Total Pages : 526 pages
Book Rating : 4.7/5 (281 download)

DOWNLOAD NOW!

Book Synopsis Energy from the Earth by : Stefan Hirschberg

Download or read book Energy from the Earth written by Stefan Hirschberg and published by vdf Hochschulverlag AG. This book was released on 2014-11-19 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt: Switzerland's Energy Strategy 2050 requires energy efficiency to be substantially improved, the proportion of fossil fuels in the energy supply to be considerably reduced, and nuclear power to be phased out, while meeting highly ambitious climate protection targets. One of the core implications is the need for a massive increase of the use of renewable sources for electricity generation. In this context, the Swiss Federal Office of Energy (SFOE) estimates that by 2050 deep geothermal energy could contribute 4–5 TWh per year to electricity generation in Switzerland, which would be a substantial contribution to a projected annual power need of 60 TWh. Geothermal energy is attractive because of the very large scale of the resource, its expected relatively low CO2 emissions, and its reliable, all-day domestic availability. However, the future contribution of deep geothermal energy is subject to major uncertainties: How much of this resource can be exploited and at what economic cost? What are the environmental and risk-related externalities that the public must be willing to bear? How does its overall performance compare to competing energy resources? And will the regulatory framework and public acceptance be sufficient to allow geothermal energy to provide a significant contribution? By way of this major interdisciplinary study, already considered a work of reference, TA-SWISS provides answers to these questions in a comprehensive and balanced way, thereby supplying a sound basis for stakeholder decision-making.

Evaluation of Seismic Activity and Fault Reactivation for Enhanced Geothermal Systems

Author : Faraz Valipoor Goodarzi
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (126 download)

DOWNLOAD NOW!

Book Synopsis Evaluation of Seismic Activity and Fault Reactivation for Enhanced Geothermal Systems by : Faraz Valipoor Goodarzi

Download or read book Evaluation of Seismic Activity and Fault Reactivation for Enhanced Geothermal Systems written by Faraz Valipoor Goodarzi and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Growth in energy demand from developing nations necessitates the utilization of all available sources of energy. Primarily due to their environmental benefits, clean and renewable energy resources are of particular interest. Moreover, since renewable energy is gathered from naturally replenished sources, it is widely available around the world. Origins of renewable energy include sunlight, rain, wind, waves, and geothermal heat. Of these, geothermal heat is the area of focus in this research. The main goal of geothermal energy technology is to find a way to transfer the thermal energy to the surface where it can be used for heating and generating electricity. All geothermal technologies are based on this principle. The process of geothermal energy extraction can take place in both shallow and deep layers of crust. Among the commonly available energy extraction technologies, Enhanced Geothermal System (EGS) is of particular interest in this research. Through EGS, a cold fluid is injected into the ground and extracted heat energy is delivered through a process called "hydraulic stimulation". The target of this research is to develop a model to investigate the geomechanical issues of a deep EGS set-up in addition to the influence of the "hydraulic stimulation" process on the geologic medium, particularly the problem of induced seismicity in a pre-existing fault which exists in the system. A 2D numerical finite element code is developed to iv analyze the behavior of porous subsurface in terms of displacement, stress, fluid pressure distribution, and temperature through a coupled thermo-hydro-mechanical (THM) approach using the corresponding mathematical governing equations. After modeling an EGS setup and stimulation program, an efficient approach is introduced along the concept of Mohr-Coulomb diagram which enables studying the seismic risk potential in an EGS using the final stress state of the geologic medium obtained from the THM approach.

Passive Seismic Monitoring of Induced Seismicity

Author : David W. Eaton
Publisher : Cambridge University Press
ISBN 13 : 1108596665
Total Pages : 377 pages
Book Rating : 4.1/5 (85 download)

DOWNLOAD NOW!

Book Synopsis Passive Seismic Monitoring of Induced Seismicity by : David W. Eaton

Download or read book Passive Seismic Monitoring of Induced Seismicity written by David W. Eaton and published by Cambridge University Press. This book was released on 2018-04-26 with total page 377 pages. Available in PDF, EPUB and Kindle. Book excerpt: The past few decades have witnessed remarkable growth in the application of passive seismic monitoring to address a range of problems in geoscience and engineering, from large-scale tectonic studies to environmental investigations. Passive seismic methods are increasingly being used for surveillance of massive, multi-stage hydraulic fracturing and development of enhanced geothermal systems. The theoretical framework and techniques used in this emerging area draw on various established fields, such as earthquake seismology, exploration geophysics and rock mechanics. Based on university and industry courses developed by the author, this book reviews all the relevant research and technology to provide an introduction to the principles and applications of passive seismic monitoring. It integrates up-to-date case studies and interactive online exercises, making it a comprehensive and accessible resource for advanced students and researchers in geophysics and engineering, as well as industry practitioners.

Geothermal Induced Seismicity National Environmental Policy Act Review

Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)

DOWNLOAD NOW!

Book Synopsis Geothermal Induced Seismicity National Environmental Policy Act Review by :

Download or read book Geothermal Induced Seismicity National Environmental Policy Act Review written by and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This presentation reviews four National Environmental Policy Act of 1969 (NEPA) documents to understand how Federal agencies, including the U.S. Bureau of Land Management and Department of Energy, review and analyze the potential impacts to the human environment when funding or approving permits for enhanced geothermal system with the potential for induced seismicity.

Evaluation of Seismic Probability and Fault Reactivation for Enhanced Geothermal Systems

Author : Faraz Valipoor Goodarzi
Publisher :
ISBN 13 :
Total Pages : 106 pages
Book Rating : 4.:/5 (988 download)

DOWNLOAD NOW!

Book Synopsis Evaluation of Seismic Probability and Fault Reactivation for Enhanced Geothermal Systems by : Faraz Valipoor Goodarzi

Download or read book Evaluation of Seismic Probability and Fault Reactivation for Enhanced Geothermal Systems written by Faraz Valipoor Goodarzi and published by . This book was released on 2017 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: Growth in energy demand from developing nations necessitates the utilization of all available sources of energy. Primarily due to their environmental benefits, clean and renewable energy resources are of particular interest. Moreover, since renewable energy is gathered from naturally replenished sources, it is widely available around the world. Origins of renewable energy include sunlight, rain, wind, waves, and geothermal heat. Of these, geothermal heat is the area of focus in this research. The main goal of geothermal energy technology is to find a way to transfer the thermal energy to the surface where it can be used for heating and generating electricity. All geothermal technologies are based on this principle. The process of geothermal energy extraction can take place in both shallow and deep layers of crust. Among the commonly available energy extraction technologies, Enhanced Geothermal System (EGS) is of particular interest in this research. Through EGS, a cold fluid is injected into the ground and extracted heat energy is delivered through a process called “hydraulic stimulation”. The target of this research is to develop a model to investigate the geomechanical issues of a deep EGS set-up in addition to the influence of the “hydraulic stimulation” process on the geologic medium, particularly the problem of induced seismicity in a pre-existing fault which exists in the system. A 2D numerical finite element code is developed to iv analyze the behavior of porous subsurface in terms of displacement, stress, fluid pressure distribution, and temperature through a coupled thermo-hydro-mechanical (THM) approach using the corresponding mathematical governing equations. After modeling an EGS setup and stimulation program, an efficient approach is introduced along the concept of Mohr-Coulomb diagram which enables studying the seismic risk potential in an EGS using the final stress state of the geologic medium obtained from the THM approach.

Understanding the Relationship Between Hydraulic Properties of Rocks and Induced Seismicity in the Stimulation of Enhanced Geothermal Systems

Download Understanding the Relationship Between Hydraulic Properties of Rocks and Induced Seismicity in the Stimulation of Enhanced Geothermal Systems PDF Online Free

Author : Jeremy Riffault
Publisher :
ISBN 13 :
Total Pages : 199 pages
Book Rating : 4.:/5 (111 download)

DOWNLOAD NOW!

Book Synopsis Understanding the Relationship Between Hydraulic Properties of Rocks and Induced Seismicity in the Stimulation of Enhanced Geothermal Systems by : Jeremy Riffault

Download or read book Understanding the Relationship Between Hydraulic Properties of Rocks and Induced Seismicity in the Stimulation of Enhanced Geothermal Systems written by Jeremy Riffault and published by . This book was released on 2019 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis discusses the construction of numerical models to gain insight on Enhanced Geothermal System (EGS) stimulation operations. These operations consist of high pressure injection of cold water in low permeability formations at depth of 2-4 kilometres, promoting the opening of existing fractures and creating an artificial geothermal reservoir. Typically a large seismicity cloud is generated. The physical mechanisms involved in permeability enhancement and seismicity triggering are numerous, and their relative importance is not always agreed on, which makes designing such operations challenging. The extent of the stimulated volume, that underwent permeability enhancement is the principal metric of the success of an EGS stimulation operation, and is not measurable, or estimated only through the size of the seismically active volume. We address those two issues using a novel modelling approach. While a simple physics-based permeability model is explored, most of our efforts are directed to the development of an empirical permeability inversion method. We demonstrate that seismicity density can be used as a proxy for pressure increase. The pressure distribution itself is a function of the hydrological properties evolution, permeability and porosity, with space and time in the course of the stimulation. We create an inverse modelling approach in which permeability enhancement candidate scenarios are proposed until the modelled seismicity density distribution matches the observations. These permeability scenarios have no physical motivation, and thus do not embed any assumptions or bias on the physical mechanisms responsible for stimulation. Stimulation parameters, injection rate and pressure, are also considered in the inversion. Special attention is given to the impact of parameter and observation uncertainty, as well as structural error, on the robustness of our conclusions. We consider two Australian Enhanced Geothermal System projects, Habanero and Paralana, where stimulations were conducted in 2003 and 2011, respectively. Large planar clouds of micro-seismicity were recorded in both cases, with 10,436 and 4,753 events recorded above magnitude of completeness for Habanero and Paralana respectively. A one-dimensional radial geometry version of our inversion method is applied to the Paralana dataset. The recovered permeability regime implies that the bulk of permeability enhancement, up to 30x its initial values, occurred within a 60 m radius of the wellbore and was not coincident with the bulk of the seismicity, which extends more than 400 m away from the injection point. Thus, permeability enhancement and induced seismicity are decoupled in this case, contrary to the traditional assumption in EGS modelling. Hydroshearing seemed to have not been responsible for much permeability increase. The two-dimensional version of the inversion is applied to the Habanero dataset. The solution range is less constrained than for the radial inversion, but still provides some insight on the stimulation process. Large scale permeability enhancement (> x10) is limited to volumes in the vicinity of the wellbore, representing approximately 5 % of the seismically active volume. This method, which already provides valuable insight on stimulation success, could be improved and be of great help to the future of EGS projects.

The Mechanism of Induced Seismicity

Author : Cezar I. Trifu
Publisher : Birkhäuser
ISBN 13 : 3034881797
Total Pages : 632 pages
Book Rating : 4.0/5 (348 download)

DOWNLOAD NOW!

Book Synopsis The Mechanism of Induced Seismicity by : Cezar I. Trifu

Download or read book The Mechanism of Induced Seismicity written by Cezar I. Trifu and published by Birkhäuser. This book was released on 2012-12-06 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Earthquakes and Multi-hazards Around the Pacific Rim, Vol. I

Author : Yongxian Zhang
Publisher : Birkhäuser
ISBN 13 : 3319715658
Total Pages : 262 pages
Book Rating : 4.3/5 (197 download)

DOWNLOAD NOW!

Book Synopsis Earthquakes and Multi-hazards Around the Pacific Rim, Vol. I by : Yongxian Zhang

Download or read book Earthquakes and Multi-hazards Around the Pacific Rim, Vol. I written by Yongxian Zhang and published by Birkhäuser. This book was released on 2017-12-20 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first of two volumes devoted to earthquakes and multi-hazards around the Pacific Rim. The circum-Pacific seismic belt is home to roughly 80% of the world’s largest earthquakes, making it the ideal location for investigating earthquakes and related hazards such as tsunamis and landslides. Gathering 16 papers that cover a range of topics related to multi-hazards, the book is divided into three sections: earthquake physics, earthquake simulation and data assimilation, and multi-hazard assessment and earthquake forecasting models. The first section includes papers on laboratory-derived rheological parameters as well as seismic studies in the Gulf of California and China. In turn, the second section includes papers on improvements in earthquake simulators as well as the statistical methods used to evaluate their performance, automated methods for determining fault slip using near-field interferometric data, variabilities in earthquake stress drops in California, and the use of social media data to supplement physical sensor data when estimating local earthquake intensity. The final section includes a paper on probabilistic tsunami hazard assessment, several papers on time-dependent seismic hazard analysis around the Pacific Rim, and a paper on induced and triggered seismicity at the Geysers geothermal field in California. Rapid advances are being made in our understanding of multi-hazards, as well as the range of tools used to investigate them. This volume provides a representative cross-section of how state-of-the-art knowledge and tools are currently being applied to multi-hazards around the Pacific Rim. The material here should be of interest to scientists involved in all areas of multi-hazards, particularly seismic and tsunami hazards. In addition, it offers a valuable resource for students in the geosciences, covering a broad spectrum of topics related to hazard research.

Passive Seismic Monitoring of Induced Seismicity

Author : David W. Eaton
Publisher : Cambridge University Press
ISBN 13 : 1108636764
Total Pages : 378 pages
Book Rating : 4.1/5 (86 download)

DOWNLOAD NOW!

Book Synopsis Passive Seismic Monitoring of Induced Seismicity by : David W. Eaton

Download or read book Passive Seismic Monitoring of Induced Seismicity written by David W. Eaton and published by Cambridge University Press. This book was released on 2018-04-26 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: The past few decades have witnessed remarkable growth in the application of passive seismic monitoring to address a range of problems in geoscience and engineering, from large-scale tectonic studies to environmental investigations. Passive seismic methods are increasingly being used for surveillance of massive, multi-stage hydraulic fracturing and development of enhanced geothermal systems. The theoretical framework and techniques used in this emerging area draw on various established fields, such as earthquake seismology, exploration geophysics and rock mechanics. Based on university and industry courses developed by the author, this book reviews all the relevant research and technology to provide an introduction to the principles and applications of passive seismic monitoring. It integrates up-to-date case studies and interactive online exercises, making it a comprehensive and accessible resource for advanced students and researchers in geophysics and engineering, as well as industry practitioners.