基于起伏地表的叠前逆时偏移成像

摘要

中国西部地区复杂地表条件对准确地震成像提出了挑战。通过对起伏地表模型的数值模拟和处理分析，探讨了起伏地表条件下地震成像存在的问题和解决方法，实现了基于起伏地表的叠前逆时偏移，并用来对模型数据进行处理。与常规处理方法和基于浮动基准面的叠前深度偏移相比，该方法在地形复杂的陕北地区取得了良好的效果。%The complex relief surfaces in western China challenge correct seismic imaging of them. The numerical sinmlation and process- ing analysis of the relief surface model were conducted, and the problems existed in the seismic imaging under relief surface conditions and solutions were discussed, including realization of pre-stack reverse time migration based on relief surfaces and processing of the model da- ta. Compared with conventional processing approaches and pre-stack depth migration based on floating datum, this method can be effective- ly applied to the northern Shaanxi with complex landforms.