Application of post-and-pre-stack multi-scale fracture prediction technology based on OBC seismic data in the reservoir of Weixinan buried hill
The reservoir of Weixinan buried hill has excellent resource potential,but the accuracy of conventional fracture prediction methods based on single post-stack seismic attribute cannot meet the needs of precise target evaluation.Based on the advantage of wide azimuth data in OBC seismic data,the article utilizes multiple attributes such as coherence,curvature,and likelihood to improve the reliability of crack prediction in post-stack attribute large-scale crack prediction.Furthermore,a fu-sion method based on multi-azimuth prediction and a data optimization prediction method based on normal illumination are pro-posed.The data foundation is improved through multi-azimuth division and normal illumination,respectively,to improve the accuracy of crack prediction.In pre-stack crack prediction,gather optimization processing is conducted to calculate anisotropic strength based on AVAZ,which leads to the density and direction of mesoscale cracks.Finally,the understanding of small-scale fracture development was obtained through drilling imaging,and a post-and-pre-stack multi-scale fracture prediction tech-nology based on OBC seismic data is ultimately formed,achieving good application results.
国家科技期刊平台
NSTL
万方数据
维普
