Chapter 4: Rock Properties
A knowledge of local rock properties is necessary before AVO analysis can be conducted in an area. In this chapter we discuss three wells in the case study area. Measurements of Vs in the case study area are compared to calculations of Vs for shales, wet sands, and gas sands. Measured S-wave velocities are closely matched by calculated velocities for shales but not for sands.
Figures & Tables
A cursory look at the contents of the book might lead the reader to belive that AVO is not a successful hydrocarbon indicator, as we show many examples of AVO predictions gone awry, and dry holes drilled based on AVO anomalies. However, a closer look at the pages will give the reader the message we are trying to convey: used properly and cautiously, AVO can be a valuable tool for direct detection. The preponderance of unhappy endings in the book is unavoidable, as the goal of this book is to provide information that may prevent other dry holes being drilled. Inevitably, the best lessons are learned from mistakes, a statement that applies to life in general as well as to seismic interpretation.