各向异性叠前时间偏移在南黄海海相油气勘探中的应用

APPLICATION OF ANISOTROPIC PRESTACK TIME MIGRATION TO MARINE STRATA IN SOUTH YELLOW SEA

摘要: 与常规叠后时间偏移相比,叠前时间偏移具有更高的成像精度、信噪比和更好的波组特征,特别在构造复杂、速度横向变化大的地区,叠前时间偏移的优势更为明显。基于各向异性叠前时间偏移,考虑了地层的非均质性和复杂地震射线的传播问题,提高了对复杂地质构造的成像精度。针对南黄海海相油气地震勘探中的成像难题和原始地震资料品质,通过处理攻关试验形成了以各向异性Kirchhoff叠前时间偏移技术为主体的成像处理流程和参数,改善勘探目标层的成像品质。

Abstract: Compared to the conventional post-stack migration,the pre-stack time migration can enhance the accuracy of images,increase the ratio of signal to noise and make the wave group characteristics of seismic reflection zone clearer,especially in the areas with complicated structure and strong variation of lateral velocity.In This paper,we proposed a seismic imaging processing flowchart and parameters according to the method of anisotropic Kirchhoff pre-stack time migration, though there were problems in dealing with the available data in imaging and data quality. As the result, the quality of seismic trace gathers and sections and the imaging accuracy were obviously improved.