Elastic anisotropy of porous and fractured rocks under stress

Serge A. Shapiro, Katharina Becker, Sergei Stanchits

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Elastic properties of rocks are functions of tectonic stresses. Using the theory of poroelasticity we analyze mechanisms of these dependencies related to changes of the rock-pore-space geometry. We develop a formalism describing elastic moduli and anisotropy of rocks as non-linear functions of confining stresses and pore pressure. It is the stress dependent geometry of the pore space that fully controls the stress-induced changes of elastic moduli and seismic velocities. Changes of the compliant porosity with differential stress explain the often observed exponential behaviour of elastic moduli. We introduce a tensor quantity defining the sensitivity of elastic moduli of rocks to the differential stress and call it the stress-sensitivity tensor. We show how anisotropy parameters depend on the stress sensitivity. Laboratory observations on rocks (e.g., porous basalts) are in a very good agreement with our formalism.

Original languageEnglish
Title of host publicationSociety of Exploration Geophysicists - 75th SEG International Exposition and Annual Meeting, SEG 2005
PublisherSociety of Exploration Geophysicists
Pages1489-1492
Number of pages4
ISBN (Print)9781604236101
DOIs
Publication statusPublished - 2005
Externally publishedYes
Event75th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2005 - Houston, United States
Duration: 6 Nov 200511 Nov 2005

Publication series

NameSociety of Exploration Geophysicists - 75th SEG International Exposition and Annual Meeting, SEG 2005

Conference

Conference75th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2005
Country/TerritoryUnited States
CityHouston
Period6/11/0511/11/05

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