Azimuthal analysis of pp-wave attenuation in a fractured medium covering a target layer using wide-azimuth seismic survey data

Abstract

The paper considers PP-wave attenuation in an anisotropic fractured medium covering the target layer. Azimuthal and offset variations of inverse quality factor (QVOA) were estimated from 3D seismic data by a software module developed in IPGG SB RAS. Spectral ratio method was used to estimate attenuation. We used developed QVOA inversion module on 3D CDP data from one of the fields in the Republic of Serbia. The distributions of fracturing orientation and attenuation anisotropy degree in the layer of Neogene rock are presented as results. This layer covers Paleozoic basement, which is the main target layer for oil exploration in this area. The obtained distributions should be considered during AVAZ inversion interpretation of reflections from Paleozoic basement due to possible footprints.