Shear wave splitting and fluid flow in highly anisotropic shale gas reservoirs

A. F. Baird*, J. M. Kendall, J. Budge

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

We present a study of shear-wave splitting using microseismic sources in a highly anisotropic shale gas reservoir. We observe very strong anisotropy (up to 30% in some cases) with a predominantly VTI symmetry (vertical transverse isotropy). Splitting is strongest for near-horizontal rays where the SH leads SV, however, for steeper inclinations SV is faster and we observe a triplication in the SV wavefront. Although much of this anisotropy can be explained due to the intrinsic anisotropy of the phyllosilicate material, we suggest that an additional contribution from horizontal microcracks with low hydraulic connectivity may be required to produce the observed patterns of anisotropy. This has important implications for fracture treatments, as the reactivation and interaction of these horizontal cracks with induced hydraulic fractures may be an important mechanism to facilitate gas flow.

Original languageEnglish
Title of host publication78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential
PublisherEuropean Association of Geoscientists and Engineers, EAGE
ISBN (Electronic)9789462821859
Publication statusPublished - 2016
Event78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential - Vienna, Austria
Duration: 30 May 20162 Jun 2016

Conference

Conference78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential
CountryAustria
CityVienna
Period30/05/162/06/16

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