Study of stress-induced anisotropy and effect of crack infill in oil and gas reservoirs
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Seismic anisotropy, defined as the variation of seismic velocity with propagation direction, often affects seismic data significantly. In this thesis, theoretical models are developed for seismic anisotropy arising from the application of triaxial stress to dry rocks, and for the dependency of anisotropy parameters on the saturating fluid and seismic frequency. The theoretical results show good agreement with laboratory measurements, and are used to estimate compressional-wave anisotropy from shear-wave anisotropy obtained from borehole seismic data.
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Estimating azimuthal stress-induced P-wave anisotropy from S-wave anisotropy using sonic log or vertical seismic profile dataCollet, O.; Gurevich, Boris; Duncan, G. (2015)Most sedimentary rocks are anisotropic, yet it is often difficult to accurately incorporate anisotropy into seismic workflows because analysis of anisotropy requires knowledge of a number of parameters that are difficult ...
Exploring the relative contribution of mineralogy and CPO to the seismic velocity anisotropy of evaporitesVargas-Meleza, L.; Healy, D.; Alsop, G.I.; Timms, Nicholas Eric (2015)We present the influence of mineralogy and microstructure on the seismic velocity anisotropy ofevaporites. Bulk elastic properties and seismic velocities are calculated for a suite of 20 natural evaporate samples, which ...
Madadi, Mahyar; Pervukhina, Marina; Gurevich, Boris (2013)We propose an analytical model for seismic anisotropy caused by the application of an anisotropic stress to an isotropic dry rock. We first consider an isotropic, linearly elastic medium (porous or non-porous) permeated ...