Summary
Organic-rich shales are often strongly anisotropic as a result of the partial alignment of anisotropic clay minerals, and the bedding-parallel lamination of organic material within the shale. Neglecting shale anisotropy may lead to incorrect estimates of rock and fluid properties derived from inversion of Amplitude Versus Offset (AVO) seismic data. The presence of kerogen in organic-rich shales leads to a strong negative PP-reflection amplitude that decreases in magnitude with increase in offset in a way that depends on the aspect ratio and connectivity of the organic phase. Thus the AVO response is a function of both the composition and anisotropic texture of the rock.
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2013. Society of Exploration Geophysicists
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