摘要
基于叠前道集振幅随方位变化(AVAZ)的叠前裂缝预测方法对小尺度裂缝具有较好的预测效果,但鲜少见到在海洋地震资料中应用,主要原因是,受海洋地震采集制约,海洋宽方位地震资料采集较少,单方位覆盖次数低,且不同方位偏移距及覆盖均衡性差,较难满足AVAZ对叠前道集的要求.本文总结了一套适用于涠西南海洋OBC地震资料的叠前裂缝预测处理流程,从OVT成果道集着手,提出基于方位各向异性保持的去噪处理技术,针对不同方位数据均衡性差等不足开展偏移距及方位分组优选,并基于此预处理道集开展AVAZ叠前裂缝预测,预测结果与新钻井成像测井结果吻合,验证了本文方法的可行性.
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.
作者
鲁统祥
李明
周凡
黎孝璋
刘爱群
LU TongXiang;LI Ming;ZHOU Fan;LI XiaoZhang;LIU AiQun(Zhanjiang Branch,CNOOC Ltd.,Zhanjiang 524057,China;Hainan Branch,CNOOC Ltd.,Haikou 570100,China)
出处
《地球物理学进展》
CSCD
北大核心
2024年第2期800-810,共11页
Progress in Geophysics
基金
中国海洋石油有限公司“潜山油气成藏理论与勘探关键技术”(KJGG2022-0302)资助。
