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Impacts of kerogen content and fracture properties on the anisotropic seismic reflectivity of shales with orthorhombic symmetry

Yang Li, Xiaoyang Wu and Mark Chapman
Impacts of kerogen content and fracture properties on the anisotropic seismic reflectivity of shales with orthorhombic symmetry (in Fractures, Anonymous)
Interpretation (Tulsa) (August 2015) 3 (3): ST1-ST7

Abstract

Shale often has strong intrinsic anisotropy, which can be described by transverse isotropy with a vertical axis of symmetry. When vertical fractures are present, shale is likely to exhibit orthorhombic symmetry. We used anisotropic rock-physics models to describe the orthorhombic properties of fractured shale, and we determined that composition and fracture properties had an impact on the azimuthal amplitude variations. Interpretation of azimuthal reflectivity variations was often performed under simplified assumptions. Although the Ruger equation was derived for weak anisotropy and for transverse isotropy with a horizontal axis of symmetry, our results indicated that the orthorhombic response can be well described by the Ruger equation. However, ambiguities could be introduced into the interpretation of parameters. We suggested that careful rock-physics modeling was important for interpreting the anisotropic seismic response of fractured shale.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 3
Serial Issue: 3
Title: Impacts of kerogen content and fracture properties on the anisotropic seismic reflectivity of shales with orthorhombic symmetry
Title: Fractures
Author(s): Li, YangWu, XiaoyangChapman, Mark
Author(s): Anonymous
Affiliation: University of Edinburgh, Edinburgh, United Kingdom
Pages: ST1-ST7
Published: 201508
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 19
Accession Number: 2015-073890
Categories: Economic geology, geology of energy sourcesApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: British Geological Survey, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201532
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