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• W2969851674 abstract "Abstract Anisotropy is an important property of inhomogeneous underground rocks and a central topic for geophysical exploration. Detecting the inhomogeneous anisotropy of rocks is key for rational oil and gas reservoir utilization and well placement optimization. Conventional cross dipole measurements can only evaluate the anisotropy of formation rocks near the borehole wall, and are therefore unable to evaluate the rock anisotropy at a distance from the borehole. This study investigates the anisotropic distribution of rock heterogeneity and the resulting azimuthal variation of the acoustic scattering intensity. The results show that this azimuthal scattering intensity variation of the dipole shear-wave acoustic logging data can be used to evaluate the anisotropic distribution of the rock heterogeneity. A borehole model with a three-dimensional heterogeneous and anisotropic elastic formation was established first, and the dipole acoustic logging along the borehole model was simulated using a finite difference technique. The wave-scattering effect in the borehole dipole wave data, measured in terms of a coda wave attenuation, was analyzed. The scattering attenuations of coda waves measured in different azimuthal directions exhibit significant variations, which are related to the azimuthal variation of the formation inhomogeneity. Based on the results of theoretical modeling, a method for the evaluation of the anisotropic variation of formation inhomogeneity (via azimuthal pattern of the scattering attenuations) was proposed. The method was applied to dipole acoustic logging data, acquired before and after hydraulically fracturing a tight reservoir. The field data results show that the scattered dipole-shear coda wave attenuation of the after-fracturing data exhibits an elongated, anisotropic variation pattern, where the direction of elongation coincides with the fracture extension direction. This indicates good potential for using the proposed method for hydraulic fracture evaluation. Because wave scattering occurs in a large volume around the borehole, application of this method and analysis can significantly enhance the measurement volume of the cross-dipole logging technology. This extends its effectiveness toward the evaluation of hydraulic fracturing results for unconventional reservoirs (e.g., shale gas)." @default.
• W2969851674 created "2019-08-29" @default.
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• W2969851674 date "2019-12-01" @default.
• W2969851674 modified "2023-09-24" @default.
• W2969851674 title "Borehole elastic wave anisotropic scattering and application to hydraulic fracturing" @default.
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• W2969851674 doi "https://doi.org/10.1016/j.petrol.2019.106405" @default.
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