The Barnett Shale is one of the first and most fully developed shale gas plays in North America. In this play, the knowledge of natural and induced fracture orientation and intensity is of great importance in the choice of drilling direction and completion program. In this study, the organic-rich Barnett Shale reservoir has been extensively hydro-fractured by high pressure to simulate production prior to the acquisition of the 3D seismic survey. The objective is to recognize gas-or water-charged induced damaged rock and to identify any bypassed pay. We migrate our seismic data using a new binning approach that sorts the data by azimuth as it is imaged in the subsurface. The motivation for this binning method is to better image lineaments as indicated by the most-positive principal curvature. We find a preferential image when structural lineaments lie perpendicular to the illumination direction. We also measure the impedance as a function of azimuth in an effort to determine the present day stress field and induced fractures in the Barnett Shale. Since velocity is anisotropic in the presence of anisotropic stress fields and/or the presence of natural or induced fractures, Pwave impedance, which is the product of density and velocity, is also anisotropic. The resultant image of the azimuth of maximum impedance and degree of impedance anisotropy correlates well with the k 1 most positive principal curvature.
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