About This Item
Share This Item
Abstract: Understanding a Seismic Response from a Petrophysical Perspective
Log editing and interpretation are two critical components of any petrophysical evaluation. Petrophysics is also an important tool which allows the geophysical interpreter to establish a link between reservoir properties (such as fluid content and reservoir quality) and an observed seismic response. Indeed, the seismic response (pre- or post-stack) of any given reservoir or prospect cannot be understood without the examination of the in-situ rock properties from nearby wells (Fig. 1). In addition to understanding the in-situ response at a nearby well location, most AVO studies also utilize forward models (e.g., fluid and porosity substitutions) in an effort to understand the possible range of fluid and lithology combinations that might give rise to an observed response over a prospect (Fig. 2). This combination of petrophysics and seismic modeling is frequently referred to as "seismic petrophysics," and is a necessary part of any amplitude-versus-offset (AVO) analysis (Fig. 3). From this type of analysis, we gain an understanding of the information that can be extracted from seismic data, along with information on how the seismic data should vary with lithology, porosity, and fluid type.
Acknowledgments and Associated Footnotes
1 VeritasDGC, 10300 Town Park Dr., Houston, TX 77072
Copyright © 2007 by The Gulf Coast Association of Geological Societies