Automatic Fracture Detection and Velocity/ Anisotropic Parameter Analysis for HTI Media from Marine NAZ 3D Super-gathers

摘要

Media exhibiting horizontal transverse isotropy are usually associated with an oriented stress field or open fractures. Seismic reflection traveltimes beneath such media vary with the source-receiver azimuth. Earlier, we proposed a method that searches simultaneously for three characteristic HTI parameters to achieve an optimum moveout correction of the narrow-azimuth NAZ gathers where multi-azimuth processing techniques are not ideal. The dominant fracturing orientation was assumed known. Here, we extend the method to detect the fracture direction and to run the automatic analysis on 3D super-gathers. Application to the same marine multi-source/streamer NAZ data demonstrates the effectiveness of the extended method.