Final Technical Report DE-FG02-99ER14933 Inversion of multicomponent seismic data and rock physics interpretation

Mavko, G.

Stanford University, Office of Sponsored Research, 320 Panama St., Stanford CA 94305

关键词: Stresses;    Anisotropy;    Rock Physics;    Stratification;    58 Geosciences;   

DOI  :  10.2172/877424
RP-ID  :  DOE/ER14933/Final
RP-ID  :  FG02-99ER14933
RP-ID  :  877424

美国|英语

来源: UNT Digital Library

【 摘 要 】

An important accomplishment was to understand the seismic velocity anisotropy resulting from the combined roles of depositional stratification and stress in unconsolidated sands. The report presents an experimental study of velocity anisotropy in unconsolidated sands at measured compressive stresses up to 40 bars, which correspond to the first hundred meters of the subsurface. Two types of velocity anisotropy are considered, that due to intrinsic textural anisotropy, and that due to stress anisotropy. We found that sand samples display a bi-linear dependence of velocity anisotropy with stress anisotropy. There exists a transition stress beyond which the stress-induced anisotropy outweighs the intrinsic anisotropy for three different sands.