Download or read book Microseismic Event Location Using the Double difference Technique for Multiplet Analysis written by Fernando Rafael Castellanos Jurado and published by . This book was released on 2013 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microseismic event location provides a plethora of information about underground processes such as hydraulic fracturing, steam injection or mining and volcano activities. Nevertheless, accuracy is limited by acquisition geometry and errors in the velocity model and time picks. Although microseismic events can happen anywhere, they tend to re-occur in the same zone. This thesis describes a post-processing technique to relocate events originated in the same source region based on the double-difference method. This technique includes a crosscorrelation procedure to detect similar events and correct time picking errors. The performance of the algorithm is tested on synthetic data and a set of microseismic events recorded in a mine. The method significantly improves locations of similar events, compared to a conventional grid-search algorithm, revealing seismicity patterns likely associated with routine mining operations. The method also includes plots used for quality control of time picking and event location, facilitating geological interpretations.
Download or read book Coupled Thermo Hydro Mechanical Chemical Processes in Geo systems written by Ove Stephansson and published by Elsevier. This book was released on 2004-11-03 with total page 853 pages. Available in PDF, EPUB and Kindle. Book excerpt: Among the most important and exciting current steps forward in geo-engineering is the development of coupled numerical models. They represent the basic physics of geo-engineering processes which can include the effects of heat, water, mechanics and chemistry. Such models provide an integrating focus for the wide range of geo-engineering disciplines. The articles within this volume were originally presented at the inaugural GeoProc conference held in Stockholm and contain a collection of unusually high quality information not available elsewhere in an edited and coherent form. This collection not only benefits from the latest theoretical developments but also applies them to a number of practical and wide ranging applications. Examples include the environmental issues around radioactive waste disposal deep in rock, and the search for new reserves of oil and gas.
Download or read book Unconventional Reservoir Geomechanics written by Mark D. Zoback and published by Cambridge University Press. This book was released on 2019-05-16 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the beginning of the US shale gas revolution in 2005, the development of unconventional oil and gas resources has gathered tremendous pace around the world. This book provides a comprehensive overview of the key geologic, geophysical, and engineering principles that govern the development of unconventional reservoirs. The book begins with a detailed characterization of unconventional reservoir rocks: their composition and microstructure, mechanical properties, and the processes controlling fault slip and fluid flow. A discussion of geomechanical principles follows, including the state of stress, pore pressure, and the importance of fractures and faults. After reviewing the fundamentals of horizontal drilling, multi-stage hydraulic fracturing, and stimulation of slip on pre-existing faults, the key factors impacting hydrocarbon production are explored. The final chapters cover environmental impacts and how to mitigate hazards associated with induced seismicity. This text provides an essential overview for students, researchers, and industry professionals interested in unconventional reservoirs.
Download or read book High precision Microseismic Event Location for Monitoring CO2 Injection Using Double difference Tomography written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oilfield Review written by and published by . This book was released on 2005 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Accuracy and Precision of Microseismic Event Locations in Rock Burst Research Studies written by and published by . This book was released on 1992 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Integrated Geomechanical Microseismic and Laboratory Study of the Bakken Formation written by Yi Yang and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis integrates geomechanics, microseismic, and laboratory studies to investigate the role of preexisting fractures and faults in development of unconventional reservoirs. This study provides a new method for delineation of reservoir structure using microseismic data with support from geomechanics and laboratory measurement. The interpretation from this study can be applied to address some of the practical questions in highly fractured reservoirs, including, but not limited to, well design and hydraulic fracture design. The implication provides insights for future strategic development of fractured and faulted unconventional reservoirs. The first part of this thesis focuses on the production of shale oil from the Bakken Formation and consists of three approaches (Chapters 2-5). A geomechanical model shows the current stress state to be characterized by a NF/SS regime, with SHmax orientation ~N45°E. The microseismic events were recorded in six vertical observation wells during hydraulic fracturing of parallel wells X and Z, and are independently processed by two contractors. Both sets of event locations show three characteristics: First, rather than occurring in proximity to the stages being pressurized, many of the events occur along the length of well Y, a parallel well located between X and Z that had been in production for ~2.5 years at the time X and Z were stimulated. Second, relatively few fracturing stages are associated with an elongated cloud of events trending in the direction of SHmax as is commonly observed during hydraulic fracturing. Instead, the microseismic events in a number of stages appear to trend ~N75°E, about 30° from the direction of SHmax. Earthquake focal plane mechanisms confirm slip on faults with this orientation. Finally, the microseismic events are clustered at two distinct depths, one near the depth of the well being pressurized in the Middle Bakken Formation and the other ~800 ft above in the Mission Canyon Formation. Approximately 60% of the microseismic events from stage 2 exhibit similar waveforms that are occurring in adjacent multiplet clusters. Two multiplet clusters are relocated using the double-difference technique, and the relocated hypocenters are more clustered, delineating reservoir structures that are consistent with the focal plane mechanisms. We argue that all three of these patterns result from the hydraulic stimulation being dominated by flow channeling along preexisting faults. Combined analysis of hypocenter locations, focal plane mechanisms, fault slip, and 3D seismic data indicate that steeply-dipping N75°E striking faults with a combination of normal and strike-slip movement were being stimulated during hydraulic fracturing. A simple geomechanical analysis was carried out to illustrate how this occurred in the context of the current stress field, pore pressure and depletion in the vicinity of well Y during the 2.5 years of production prior to stimulation of wells X and Z. Laboratory measurements of 6 pairs of core samples from the reservoir suggest that the time dependent deformation of these rocks can be characterized by a power-law constitutive law. The constitutive parameters determined from 3-hour creep measurements follow a range and trend similar to those of samples from other shale gas reservoirs. By applying the viscous relaxation model, the differential horizontal stresses are estimated from geophysical logs. With the NF/SS faulting regime in the Bakken and an assumption of a constant faulting regime in sedimentary lithology, a continuous principal stress profile is estimated. The least horizontal stress magnitude suggests that the Lodgepole and Three Forks Formations adjacent to the Bakken Formation are not acting as frac barriers during hydraulic fracture. Thus, the asymmetric distribution of the microseismicity suggests the out-of-zone microseismic events are associated with preexisting fractures and faults rather than purely hydraulic fracturing growth. Moreover, the pore pressure perturbation required for slip is consistent with the occurrence of microseismicity, where events occur at depths that require less elevated pore pressure. Brittleness determined from elastic properties is considered, but it cannot explain the microseismicity. This is because brittleness is not an intrinsic rock property and cannot be characterized in a consistent way. Therefore, applying brittleness for locating the hydraulic fracturing sweet spot needs to be done cautiously. The second part of this thesis focuses on the feasibility of injecting CO2 to enhance coalbed methane production, as well as the capacity for long term CO2 storage in coalbeds of the Power River Basin, Wyoming. Laboratory measurements are performed to study the adsorption/desorption, mechanical, and transport properties of coal with gas saturation of He, N2, CH4 and CO2, at either increasing pore pressure or increasing effective stress. Results suggest that coal from the PRB has strong adsorption capacity for CO2, and this strong adsorption is stable unless the pore pressure drops below 2 MPa. Also, CO2-induced swelling will cause permeability loss, but the loss is less than one order of magnitude. Laboratory results indicate that the coal seam in the study area might be a good candidate for an ECBM and CO2 sequestration project. However, its feasibility still depends on future numerical modeling predictions, and the results reported in this study can be applied for further modeling work.
Download or read book Unconventional Reservoir Geomechanics written by Mark D. Zoback and published by Cambridge University Press. This book was released on 2019-05-16 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive overview of the key geologic, geomechanical and engineering principles that govern the development of unconventional oil and gas reservoirs. Covering hydrocarbon-bearing formations, horizontal drilling, reservoir seismology and environmental impacts, this is an invaluable resource for geologists, geophysicists and reservoir engineers.
Download or read book Microseismic Monitoring written by Vladimir Grechka and published by SEG Books. This book was released on 2017-09-01 with total page 471 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past decade, microseismic monitoring, a technology developed for evaluating completions of wells drilled to produce hydrocarbons from unconventional reservoirs, has grown increasingly popular among oil and gas companies. Microseismic Monitoring, by Vladimir Grechka and Werner M. Heigl, discusses how to process microseismic data, what can and cannot be inferred from such data, and to what level of certainty this might be possible. The narrative of the book follows the passage of seismic waves: from a source triggered by hydraulic fracture stimulation, through hydrocarbon-bearing formations, towards motion sensors. The waves’ characteristics encode the location of their source and its focal mechanism. The analysis of various approaches to harvesting the source-related information from microseismic records has singled out the accuracy of the velocity model, fully accounting for the strong elastic anisotropy of hydraulically fractured shales, as the most critical ingredient for obtaining precise source locations and interpretable moment tensors. The ray theory complemented by its modern extensions, paraxial and Fréchet ray tracing, provides the only practical means available today for building such models. The book is written for geophysicists interested in learning and applying advanced microseismic data-processing techniques.
Download or read book 2005 Joint Assembly written by American Geophysical Union. Joint Assembly and published by . This book was released on 2005 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Seismic Event Location written by Cliffort H. Thurber and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Seismic Event Location provides a broad overview of the fundamental issues involved in seismic event location, and presents a variety of state-of-the-art location methods and applications at a wide range of spatial scales. Three important themes in the book are: seismic monitoring for a Comprehensive Nuclear-Test-Ban Treaty (CTBT), seismic event location in three-dimensional Earth models, and methods for multiple-event location. Each chapter contains background material to help readers less familiar with the topics covered, as well as to provide abundant references for readers interested in probing deeper into a topic. However, most of the emphasis is on recent advances in methodology and their application. Audience: The book is intended primarily for academic and professional researchers and graduate students in seismology.
Download or read book Anisotropy and Microseismics Theory and Practice written by Vladimir Grechka and published by SEG Books. This book was released on 2020-08-01 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: Takes readers on a path of discovery of rarely examined wave phenomena and their possible usage. Chapters begin by formulating a question, followed by explanations of what is exciting about it, where the mystery might lie, and what could be the potential value of answering the question.
Download or read book Moment Tensor Solutions written by Sebastiano D'Amico and published by Springer. This book was released on 2018-05-12 with total page 751 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book first focuses on the explanation of the theory about focal mechanisms and moment tensor solutions and their role in the modern seismology. The second part of the book compiles several state-of-the-art case studies in different seismotectonic settings of the planet.The assessment of seismic hazard and the reduction of losses due to future earthquakes is probably the most important contribution of seismology to society. In this regard, the understanding of reliable determination seismic source and of its uncertainty can play a key role in contributing to geodynamic investigation, seismic hazard assessment and earthquake studies. In the last two decades, the use of waveforms recorded at local-to-regional distances has increased considerably. Waveform modeling has been used also to estimate faulting parameters of small-to-moderate sized earthquakes.
Download or read book Coupled Site and Soil Structure Interaction Effects with Application to Seismic Risk Mitigation written by Tom Schanz and published by Springer Science & Business Media. This book was released on 2009-06-18 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Research Workshop on Coupled Site and Soil-Structure Interaction Effects with Application to Seismic Risk Mitigation Borovets, Bulgaria 30 August - 3 September 2008
Download or read book Understanding Downhole Microseismic Data Analysis written by Jubran Akram and published by Springer Nature. This book was released on 2020-01-01 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is designed as an excellent resource text for students and professionals, providing an in-depth overview of the theory and applications of downhole microseismic monitoring of hydraulic fracturing. The readers will benefit greatly from the detailed explanation on the processes and workflows involved in the acquisition design modeling, processing and interpretation of microseismic data.
Download or read book Microseismicity a tool for reservoir characterization written by S. A. Shapiro and published by . This book was released on 2008 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Parameter Estimation and Inverse Problems written by Richard C. Aster and published by Elsevier. This book was released on 2018-10-16 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: Parameter Estimation and Inverse Problems, Third Edition, is structured around a course at New Mexico Tech and is designed to be accessible to typical graduate students in the physical sciences who do not have an extensive mathematical background. The book is complemented by a companion website that includes MATLAB codes that correspond to examples that are illustrated with simple, easy to follow problems that illuminate the details of particular numerical methods. Updates to the new edition include more discussions of Laplacian smoothing, an expansion of basis function exercises, the addition of stochastic descent, an improved presentation of Fourier methods and exercises, and more. - Features examples that are illustrated with simple, easy to follow problems that illuminate the details of a particular numerical method - Includes an online instructor's guide that helps professors teach and customize exercises and select homework problems - Covers updated information on adjoint methods that are presented in an accessible manner
