OVT域Q偏移技术在庆城页岩油开发中的应用

Application of OVT-domain Q-migration technology in shale oil development in Qingcheng

针对庆城地区页岩油储层地震资料分辨率低的现状和裂缝展布预测的需求,提出了使用多信息构建时间域Q模型、五维插值方法解决黄土塬地震采集资料OVT片空洞大的问题;然后在OVT域进行Q偏移。实际资料处理结果有效恢复了地震波高频成分,获得了包含方位角信息的高分辨率道集资料,成像剖面比常规偏移剖面有效频带展宽了6~8Hz;储层地震响应特征与实钻井相吻合,有效指导了水平井井位部署和轨迹设计,取得较好的应用效果,助推了庆城页岩油高效开发。

To overcome the low resolution of seismic data on the shale oil reservoir in the Qingcheng area and meet the demand of fracture distribution prediction,this paper proposes using multiple information to build a time-domain Q model and employing the five-dimensional interpolation method to eliminate the large offset vector tile(OVT)holes in the seismic data acquired in the loess plateau.Then,Qmigration is performed in the OVT domain.The proposed method is applied to process actual data.According to the results,the high-frequency component in the seismic wave is effectively restored,and high-resolution gather data containing azimuth information are obtained.The effective bandwidth of the imaging section is 5Hz wider than that of the imaging section attained by conventional migration.The seismic response characteristics of the reservoir are consistent with the actual drilling.Effectively guiding the placement and trajectory design of the horizontal wells,the proposed method achieves favorable application results and promotes the efficient shale oil development in Qingcheng.