Seismic Fracture Characterization: Concepts and Practical Applications
|Instructor||Enru Liu (ExxonMobil – Houston, USA)|
|Book||Available in EAGE Bookshop|
The ability to identify fracture clusters and corridors and their prevalent directions within many carbonates and unconventional resources (shale gas, tight gas and tight oil reservoirs) can have a significant impact on field development planning as well as on the placement of individual wells. The characterization of natural fractures is difficult and cannot be achieved by any single discipline or single measurement. We believe that geophysics is the only method that is able to identify spatial distributions of fractures and fracture corridors between wells, and seismically-derived fracture information complement (not compete with) other measurements, such as outcrops, core, FMI, cross-dipole and other fracture information. 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.
Upon completion of the course, participants will be able to:
- Understand key geological aspects of fractures and their roles in hydrocarbon exploration and production;
- Understand fundamental concept of seismic anisotropy and the equivalent medium representation of fractured rock;
- Understand the principal methodologies of seismic fracture characterization using shear-wave splitting and azimuthal variation of seismic attributes;
- Understand the basic data requirement, assumptions, limitations and applicability of seismic fracture prediction technology;
- Apply practical workflow introduced in this course to real seismic data;
- Interprete and integrate seismically-derived fractures with other measurements.
1) Introduction: key geological elements
2) Fundamental seismic anisotropy
3) Equivalent medium representation of fractured rock
4) Fracture characterization using P-wave data
5) Shear-waves and applications of multicomponent seismology
6) Case study 1: 3D Physical laboratory data
7) Case study 2: An example from offshore Middle East carbonate reservoir
8) Case study 3: An example from tight gas reservoir
9) Summary and road ahead
None. Students as well as experienced geoscientists and engineers should benefit from this course.
About the instructor