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The Leading Edge; September 2007; v. 26; no. 9; p. 1112-1117; DOI: 10.1190/1.2780779
© 2007 Society of Exploration Geophysicists
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Anisotropy and 4D caused by two fracture sets, four compliances, and sheared apertures

Nick Barton

Nick Barton & Associates, Oslo, Norway

Corresponding author: nickrbarton{at}hotmail.com

Conducting,"open" joints, fractures, or microcracks parallel to the classic direction of maximum horizontal stress {sigma}H are commonly referred to in the geophysics literature. In a remarkable number of these studies, stress-aligned microcracks are automatically assumed to be the source of shear-wave polarization. Fractured reservoirs, being biased samples of the "near" surface, may indicate a supplementary anisotropy, caused by a set of open fractures, again with conventional interpretation. These are also assumed to be stress-aligned.






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