Application of prestack fracture prediction based on OBC data in the reservoir of Weixinan buried hill
The prestack crack prediction method based on the amplitude variation with azimuth of prestack gathers has good prediction results for small-scale cracks,but it is rarely seen to be applied in marine seismic data,The main reason is that due to the constraints of marine seismic acquisition,the acquisition of marine wide azimuth seismic data is less,the number of single azimuth coverage is low,and the offset distance and coverage balance in different orientations are poor,making it difficult to meet the requirements of AVAZ for prestack gathers.This article summarizes a pre-stack fracture prediction procedure applicable to the offshore OBC seismic data in WeiXiNan.With the OVT result gathers,a denoising processing technology based on azimuth anisotropy preservation is proposed,and optimize offset and azimuth grouping for deficiencies such as poor balance in different orientations.Based on this preprocessing gathers,AVAZ pre-stack fracture prediction is carried out,and the fracture density and direction are consistent with the new drilling results,verified the reliability of the method proposed in this paper.
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