Microstructural influences on the stress sensitivity of crystalline and sedimentary rocks

O. Gaede, S. Shapiro, D. Dewhurst, S. Stanchits, A. Siggins

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

Abstract

Understanding the stress dependence of elastic rock properties is an essential tool for various applications in the earth sciences and the resource industries. The stress sensitivity approach presented here derives the nonlinear stress-strain relationship for a porous medium, by considering the stress induced changes of the pore geometry. We compare the stress dependence of ultrasonic velocity measurements for three rock samples that were specifically chosen for validation of the stress sensitivity approach. We used a low porosity granite,as a rock that satisfies the assumptions of the stress sensitivity approach; a clean sandstone, which strains the assumption of low porosity; and a clay-rich sandstone, that no longer can be considered as a homogenous rock. We incorporated microstructural analysis into the interpretation of the ultrasonic velocity measurements. Interpretation of the velocity measurements is straight forward for the granite. Surprisingly even porosities above 20% do not limit the interpretive power of the stress sensitivity approach. However, the influence of a high clay content does complicate the interpretation of our experimental results and further investigation maybe needed.

Original languageEnglish
Title of host publication69th European Association of Geoscientists and Engineers Conference and Exhibition 2007
Subtitle of host publicationSecuring The Future. Incorporating SPE EUROPEC 2007
PublisherSociety of Petroleum Engineers
Pages2523-2527
Number of pages5
ISBN (Print)9781605601557
DOIs
Publication statusPublished - 2007
Externally publishedYes
Event69th European Association of Geoscientists and Engineers Conference and Exhibition 2007 - "Securing The Future" - London, United Kingdom
Duration: 11 Jun 200714 Jun 2007

Publication series

Name69th European Association of Geoscientists and Engineers Conference and Exhibition 2007: Securing The Future. Incorporating SPE EUROPEC 2007
Volume5

Conference

Conference69th European Association of Geoscientists and Engineers Conference and Exhibition 2007 - "Securing The Future"
Country/TerritoryUnited Kingdom
CityLondon
Period11/06/0714/06/07

Fingerprint

Dive into the research topics of 'Microstructural influences on the stress sensitivity of crystalline and sedimentary rocks'. Together they form a unique fingerprint.

Cite this