基于井控反褶积处理的川中栖霞组构造精细解释研究

Research on fine structure interpretation of Qixia formation in central Sichuan based on well-controlled deconvolution

川中地区二叠系栖霞组储层厚度薄且主要发育于栖二地层底部,而栖二底界面的地震反射呈现为中、弱强度的弱连续性的波峰反射和空白反射特征,目前三维地震数据体难以准确地识别栖二底界面的地震反射层位。基于井控反褶积高分辨率处理方法,以研究区完钻井井震标定的合成记录的保真度为质控手段,针对栖霞组地层开展了叠后三维地震资料的高分辨率处理,获得了具有高保真度的叠后高分辨率三维数据体。高分辨率处理前、后的三维数据体的对比分析发现:该方法获得的高分辨率三维数据体不仅栖二底界面的地震反射连续性增强,而且栖霞组顶界面的地震反射由于分辨率提高而消除了复波反射。基于高分辨率三维地震数据体,完成了栖二段地层的构造解释,获得了可靠的栖二底界面的构造图,为栖霞组薄储层预测提供了一定的支持。

The permian Qixia formation reservoir in the central Sichuan area is thin and mainly developed at the bottom of the Qier stratum.The seismic reflection at the Qier bottom interface presents the characteristics of medium and weak continuous wave peak reflections and blank reflections.The current three-dimensional seismic data volume is difficult to accurately identify the seismic reflection horizon at the interface of the second bottom.Based on the high-resolution processing method of well-control deconvolution,the fidelity of the synthetic records of seismic calibration of completion wells is used in the study area as a quality control method,and high-resolution processing of post-stack 3D seismic data is carried out for the Qixia formation.A post-stack high-resolution three-dimensional data volume with high fidelity is obtained.The comparative analysis of the three-dimensional data volume before and after the high-resolution processing reflects that the high-resolution three-dimensional data volume obtained by this method not only enhances the seismic reflection continuity of the Qier bottom interface,but also the seismic reflection of the top interface of the Qixia formation due to the improved resolution.Based on the high-resolution 3D seismic data volume,this paper has completed the structural interpretation of the second member of Qixia formation,and obtains a reliable structural map of the bottom interface of Qixia formation,provides certain support for the prediction of thin reservoirs in the Qixia formation.