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Modelling and analysis of attenuation anisotropy in multi‐azimuth VSP data from the Clair field
Author(s) -
Maultzsch Sonja,
Chapman Mark,
Liu Enru,
Li XiangYang
Publication year - 2007
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.2007.00645.x
Subject(s) - attenuation , azimuth , anisotropy , geology , economic geology , fracture (geology) , gemology , seismology , regional geology , environmental geology , engineering geology , data set , observable , telmatology , geotechnical engineering , optics , physics , computer science , volcanism , tectonics , quantum mechanics , artificial intelligence
Anisotropic variations in attenuation are of interest since they can give information on the fracture system and may be more amenable to measurement than absolute attenuation values. We examine methods for detecting changes in relative attenuation with azimuth from VSP data, and validate the techniques on synthetic data. Analysis of a multi‐azimuth walkaway VSP data set from a fractured hydrocarbon reservoir indicates that such azimuthal variations in P‐wave attenuation are observable. The effects are localized in the reservoir, and analysis allows the prediction of a fracture strike direction, which agrees with geological information. The observed effects can be modelled under reasonable assumptions, which suggests the validity of the link between the anisotropic attenuation and the fracturing.