Seismic Fracture Characterization: Concepts and Practical Applications (EET 8)


Seismic Fracture Characterization: Concepts and Practical Applications

Publisher EAGE
Language ENGLISH
Publish year 2013
Pages 280 pages


During the last three decades, seismic anisotropy has evolved from a purely academic research topic into applications in the mainstream of applied geophysics. Today, nobody doubts that the earth is anisotropic and most (if not all) hydrocarbon reservoirs are anisotropic. Since shale accounts for 70% of sedimentary basins and fractures exist in all reservoirs, seismic anisotropy may be even more extensive than we think. Taking anisotropy into account in seismic processing has improved the quality of seismic images, even though it makes seismic processing more challenging since additional parameters are needed. At the same time, fracture characterization using the concept of seismic anisotropy has added value in reservoir characterization, reservoir management, and has increased recovery and optimized well locations. This book and the associated course provide an introduction to the fundamental concepts of seismic fracture characterization by introducing seismic anisotropy, equivalent-medium representation theories of fractured rock and methodologies for extracting fracture parameters from seismic data. We focus on practical applications using extensive field data examples.

Three case studies are included to demonstrate the applicability, workflow and limitations of this technology: a physical laboratory 3D experiment where fracture distributions are known, a Middle East fractured carbonate reservoir and a fractured tight gas reservoir. Our ultimate goal is to build discrete fracture network models incorporating all data. These models should not only be geologically consistent but also geophysically and geomechanically consistent, so that the models can be used to forecast the behaviour and performance of fractured reservoirs.

The EAGE’s Education Tour (EET) offers a one-day course delivered by renowned geoscientists at various locations globally. Accompanied by a comprehensive course book, it provides members and others with access to the latest developments in key topics in the Geosciences. The Tour has been a great success since its launch in 2006.

Table of contents

Acknowledgements 3
General disclaimer 5
Preface 11

1. Introduction 11
2. Fundamentals of seismic anisotropy 29
3. Equivalent medium modelling of fractured rock 59
4. Estimation of fracture parameters from azimuth analysis of P-wave data 95
5. Multicomponent seismology and its application to fracture characterization 119
6. Fracture detection using 3D seismic data: physical laboratory studies 155
7. Mitigation of overburden effects in azimuthal AVO analysis of a Middle East carbonate field 169
8. Integrated study of fracture characterization of a tight gas reservoir using 3C-3D seismic data at Piceance Basin, Colorado, USA 191
9. Summary and road ahead 207

References 221
Appendix A. The two-index notation of elastic tensors 263
Appendix B. Wave propagation in anisotropic media 265
Appendix C. Effective elastic constants of cracked media – Hudson’s model 269
Appendix D. Plane wave reflection and transmission coefficients in anisotropic media – Schoenberg and Protazio algorithm 271
Index 275

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