Download or read book Estimation of Uncertainty in Microseismic Event Location Associated with Hydraulic Fracturing written by Andres Felipe Castano and published by . This book was released on 2010 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microseismic Imaging of Hydraulic Fracturing written by Shawn Mawell and published by SEG Books. This book was released on 2014-01-01 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microseismic Imaging of Hydraulic Fracturing: Improved Engineering of Unconventional Shale Reservoirs (SEG Distinguished Instructor Series No. 17) covers the use of microseismic data to enhance engineering design of hydraulic fracturing and well completion. The book, which accompanies the 2014 SEG Distinguished Instructor Short Course, describes the design, acquisition, processing, and interpretation of an effective microseismic project. The text includes a tutorial of the basics of hydraulic fracturing, including the geologic and geomechanical factors that control fracture growth. In addition to practical issues associated with collecting and interpreting microseismic data, potential pitfalls and quality-control steps are discussed. Actual case studies are used to demonstrate engineering benefits and improved production through the use of microseismic monitoring. Providing a practical user guide for survey design, quality control, interpretation, and application of microseismic hydraulic fracture monitoring, this book will be of interest to geoscientists and engineers involved in development of unconventional reservoirs.
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 A Study Of Microseismic Location Uncertainty written by Sirui Ma and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Microseismic is an effective method of monitoring hydraulic fracture propagation in unconventional shale oil and gas field development. In this study, microseismic events are located by grid search method while location uncertainty is quantified in probability contours at the same time. We test the impact of different algorithm inputs on the location uncertainty. Variables include the choice(s) of velocity model, downhole array(s) geometry, seismic phase(s) (P-wave, SH-wave) and particle motion. We picked one perforation event recorded during the hydraulic fracturing of the Utica Shale in Ohio. By altering variables, we find out that S-wave arrival is better in constrain the uncertainty of location; whip array is better than single array; back-azimuth is not effective in downhole vertical array.
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 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 QUANTITATIVE INVERSION OF MICROSEISMIC DATA written by Manik Singh and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydraulic fracturing has brought a revolution in the oil and gas industry. It has had a tremendous impact especially on oil and gas production of the USA. The potential of hydraulic fracturing in increasing production from existing reservoirs and make tight shale plays producible has been firmly established. There is a 25 fold increase in the recovery estimates of gas-in-place by adapting technologies like hydraulic fracturing. Hydraulic fracturing has attracted a lot of research in the past decades and is still very attractive area of research. With the increasing use of hydraulic fracturing, use of microseismic monitoring has also increased. A propagating hydraulic fracture on interaction with a natural fracture gives rise to seismic waves which are monitored at locations near the fracturing zone. These monitoring tools are used along with models for the fracturing processes to monitor the growth of a hydraulic fracture in the reservoir. In current workflows, microseismic interpretation is used for qualitative description of the reservoir. It gives the information about the presence of natural fractures locations by inverting for the location of the microseismic event. Microseismic waves carry information about the reservoir it travels in. Which is highly heterogeneous and scarcely sampled. The interpretation of this information has a lot of uncertainties in terms of location of the natural fractures. The uncertainties stem from various reasons like the distribution of reservoir properties, discrete fracture network (DFN) and direction of propagation of the hydraulic fracture. A deterministic inversion does not give an idea about the uncertainties associated with the inversion. To correctly infer the uncertainties in such reservoirs there is a need to run multiple computer simulations for every possible DFN configuration and compare the synthetic and observed seismogram. This poses serious challenges as the state of the art numerical forward models are computationally intensive. Hence, we need models, proxies, which are sufficiently able to capture the physics of the problem while being computationally fast.We use analytical models for fracture propagation and seismic wave propagation. These models while having more assumptions than a comprehensive numerical 3D model are considerably faster. However, there is no single analytical or semi-analytical model which would cover the full range of processes involved in the problem. Hence, several standalone models need to be coupled to each other in order to have proxy model, that can yield synthetic seismograms generated corresponding to the propagation of a hydraulic fracture in a DFN. Model selection and assessment of uncertainties requires running the proxy model on a suite of reservoir models with different DFN configurations. Computed seismograms when compared to the observed seismograms yields the posterior set of models which give responses similar to observed microseismic. The Bayesian approach gives the uncertainties associated with the interpretation. Selected DFN configurations can be simulated later for validation using a full physics simulator. The aim of the research is to quantitatively interpret the microseismic data for the description of DFN and quantify the uncertainty associated with the description. Knowledge of DFN and associated uncertainty with interpretation is particularly important in planning drilling, stimulation or fracture jobs in the future.
Download or read book Rockburst written by Xia-Ting Feng and published by Butterworth-Heinemann. This book was released on 2017-10-19 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rockburst: Mechanisms, Monitoring, Warning and Mitigation invites the most relevant researchers and practitioners worldwide to discuss the rock mechanics phenomenon related to increased stress and energy levels in intact rock introduced by drilling, explosion, blasting and other activities. When critical energy levels are reached, rockbursts can occur causing human and material losses in mining and tunneling environments. This book is the most comprehensive information source in English to cover rockbursts. Comprised of four main parts, the book covers in detail the theoretical concepts related to rockbursts, and introduces the current computational modeling techniques and laboratory tests available. The second part is devoted to case studies in mining (coal and metal) and tunneling environments worldwide. The third part covers the most recent advances in measurement and monitoring. Special focus is given to the interpretation of signals and reliability of systems. The following part addresses warning and risk mitigation through the proposition of a single risk assessment index and a comprehensive warning index to portray the stress status of the rock and a successful case study. The final part of the book discusses mitigation including best practices for distressing and efficiently supporting rock. Designed to provide the most comprehensive coverage, the book will provide practicing mining and tunneling engineers the theoretical background needed to better cope with the phenomenon, practical advice from case studies and practical mitigation actions and techniques. Academics in rock mechanics will appreciate this complete reference to rockburst, which features how to analyze stress signals and use computational modeling more efficiently. - Offers understanding of the fundamental theoretical concepts of rockbursts - Explores how to analyze signals from current monitoring systems - Shows how to apply mitigating techniques in current work - Identifies characteristics that should be measured in order to detect rockburst risk
Download or read book Analysis of Microseismic Events Associated with Hydraulic Fracture Propagation written by Chennu Fan and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Identification and Analysis of Long duration Low frequency Events from Microseismic Data written by Hongru Hu and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydraulic fracturing is commonly used to enhance rock permeability in unconventional reservoirs. Locating microseismic events has become a standard tool in monitoring the fracturing process. However, the relation between microseismicity and crack networks has not been well understood. In addition, microseismic energy is almost negligible compared with the total energy used in fracturing. Long-duration and low-frequency (LDLF) seismic events, which are often observed in volcanic fields, have been reported from the data recorded during hydraulic fracturing. Although the origin of low-frequency events could be complicated, fluid pressurization through cracks, which is a common source for volcanic tremors, could be one main mechanism for LDLF events during hydraulic fracturing. Therefore, investigating the LDLF events from microseismic data would help to understand different types of ground deformation and help to characterize the formation of fracture network. In this research, I have identified several LDLF events using frequency-time plots from a microseismic dataset acquired by surface receivers in the Eagle Ford Shale in Mexico. Seismograms are filtered and their envelopes are calculated. Arrivals from each energy pack are picked from the envelopes using a cross-correlation method. These arrivals are then used to locate the event through a grid-search approach. The LDLF events can be categorized in two types. Type 1 events are located at around 1500 m in depth, close to the horizontal well. The associated phase arrivals show typical P-wave moveout trends. In addition, these events tend to migrate away from the treatment well with time. Type 1 events are probably caused by fluid pressurization in fractures. Type 2 events are located near the surface and the waves travel at a Rayleigh wave speed. The source mechanism of type 2 events is not clear, but could be related to vibrations of the operation equipment.
Download or read book Porous Rock Fracture Mechanics written by Amir Shojaei and published by Woodhead Publishing. This book was released on 2017-05-05 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: Porous Rock Failure Mechanics: Hydraulic Fracturing, Drilling and Structural Engineering focuses on the fracture mechanics of porous rocks and modern simulation techniques for progressive quasi-static and dynamic fractures. The topics covered in this volume include a wide range of academic and industrial applications, including petroleum, mining, and civil engineering. Chapters focus on advanced topics in the field of rock's fracture mechanics and address theoretical concepts, experimental characterization, numerical simulation techniques, and their applications as appropriate. Each chapter reflects the current state-of-the-art in terms of the modern use of fracture simulation in industrial and academic sectors. Some of the major contributions in this volume include, but are not limited to: anisotropic elasto-plastic deformation mechanisms in fluid saturated porous rocks, dynamics of fluids transport in fractured rocks and simulation techniques, fracture mechanics and simulation techniques in porous rocks, fluid-structure interaction in hydraulic driven fractures, advanced numerical techniques for simulation of progressive fracture, including multiscale modeling, and micromechanical approaches for porous rocks, and quasi-static versus dynamic fractures in porous rocks. This book will serve as an important resource for petroleum, geomechanics, drilling and structural engineers, R&D managers in industry and academia. - Includes a strong editorial team and quality experts as chapter authors - Presents topics identified for individual chapters are current, relevant, and interesting - Focuses on advanced topics, such as fluid coupled fractures, rock's continuum damage mechanics, and multiscale modeling - Provides a 'one-stop' advanced-level reference for a graduate course focusing on rock's mechanics
Download or read book Uncertainty Analysis and Reservoir Modeling written by Y. Zee Ma and published by AAPG. This book was released on 2011-12-20 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Study of Microseismic Events written by Yunhui Tan and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Microseismic is commonly used to monitor the hydraulic fracturing process. Seismic signals are recorded using either surface or downhole geophones to invert for hypocenters of rock movements (moment magnitude usually between -3 and 0) happened during hydraulic fracturing. The location of these microseismic events are used to estimate the stimulated reservoir volume. This thesis focuses on further understanding of microseismic events beyond the cloud of locations. To test whether the lineament of microseismic event cloud represent fluid filled open fractures, we looked at the change of S wave from perforations when it passes microseismic event cloud (Chapter 2). Strong attenuation of S wave suggests that the microseismic event cloud indicates fluid-filled open fractures.We also studied the evolution of medium velocity structure during hydraulic fracturing. By inverting the arrival time of perforation shots recorded by downhole geophones, we found that the velocity of stimulated region is higher than the unstimulated region (Chapter 3).A new model (Rutledge-Eisner model) is introduced to describe the mechanism of microseismic event generation. This model states that the microseismic events are a results of shearing on bedding planes caused by opening of hydraulic fractures. Moment tensor inversion results from surface microseismic monitoring of the Marcellus shale is presented to validate this model (Chapter 4).Based on this model, we explained some phenomena in the temporal and spatial distribution of microseismic events under different geological and geomechanical conditions (Chapter 5). We found that microseismic events concentrate behind the fracture tip in a single planar fracture propagation. Low in-situ stress environment leads to early microseismic events while high in-situ stress lead to late microseismic events during fracturing. Natural fracture networks show unique microseismic temporal patterns with the increased sand concentration. Higher in-situ stress variation between layers lead to more microseismic events and larger magnitude.In summary, microseismic monitoring is an effective method to reveal details about hydraulic fracturing.
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 Geophysics and Geosequestration written by Thomas L. Davis and published by Cambridge University Press. This book was released on 2019-05-09 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: An overview of the geophysical techniques and analysis methods for monitoring subsurface carbon dioxide storage for researchers and industry practitioners.
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 Optimization of an automatic microseismic event location software ad application to a hydraulic fracturing dataset from a hydrocarbon reservoir written by Aurélien Mordret and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
