In situ Stress Azimuth and Magnitude from Well Log Measurements. Final Report,May 1993-May 1995

摘要

The objective of Part 1 is to: (1) theoretically relate static to dynamic moduliin rocks with clays; (2) give a theoretical method for calculating horizontal from vertical stress in rocks with stress-induced anisotropy; and (3) give a theoretical method for accounting for velocity-frequency dispersion in saturated rocks. The new theory of cementation is used to describe stress-strain laws and dynamic moduli in high-porosity granular rocks with clay. The objective of Part 2 is to prove the feasibility of determining maximum and minimum in situ stress azimuth and magnitude from dipole velocity data. The conclusion is that a flexural wave splits into two flexural waves, a slow one and a fast one, that are polarized along the minimum and maximum horizontal stress directions, respectively.