Fundamentals: Wavefield dynamics and kinematics
Published:January 01, 2016
In Chapter 3, the fundamental concepts of PS-wave seismology are discussed. This includes propagation velocities in anisotropic media, the elastodynamics involved in the generation of converted waves, reflection and transmission coefficients from elastic impedance contrasts, and the up- and downgoing wavefields recorded in VSPs. Various modeling techniques are discussed to highlight 3C seismic interpretation and responses of the full wavefield at the surface as well as VSP responses of downgoing and upgoing wavefields in the earth.
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3C Seismic and VSP: Converted waves and vector wavefield applications
3C seismic applications provide enhanced rock property characterization of the reservoir that can complement P-wave methods. Continued interest in converted P- to S-waves (PS-waves) and vertical seismic profiles (VSPs) has resulted in the steady development of advanced vector wavefield techniques. PS-wave images along with VSP data can be used to help P-wave interpretation of structure in gas obscured zones, of elastic and fluid properties for lithology discrimination from S-wave impedance and density inversion in unconventional reservoirs, and of fracture characterization and stress monitoring from S-wave birefringence (splitting) analysis. The book, which accompanies the 2016 SEG Distinguished Instructor Short Course, presents an overview of 3C seismic theory and practical application: from fundamentals of PS-waves and VSPs, through to acquisition and processing including interpretation techniques. The emphasis is on unique aspects of vector wavefields, anisotropy, and the important relationships that unify S-waves and P-waves. Various applications and case studies demonstrate image benefits from PS-waves, elastic properties and fluid discrimination from joint inversion of amplitude variations with offset/angle (AVO/A), and VSP methods for anisotropic velocity model building and improved reservoir imaging. The book will be of interest to geophysicists, geologists, and engineers, especially those involved with or considering the use of AVO/A inversion, fracture/stress characterization analyses, or interpretation in gas-obscured reservoirs.