起伏地表逆时偏移在复杂山前带地震成像中的应用

针对山前带"复杂地表、复杂构造"双复杂地震地质条件造成的资料信噪比低、静校正问题严重、地震波场复杂等一系列地球物理难题,在"真地表"地震成像面的确定及高频静校正的基础上,以基于起伏地表的深度域速度分析与建模为重点,以起伏地表逆时叠前深度偏移为核心建立了一套高精度地震成像处理流程,将长波长静校正问题隐含在偏移成像过程中,直接从起伏地表进行波场延拓和偏移成像,以便更好地应对复杂山前带的地震成像问题。针对性模型试算和实际资料处理表明,该技术在应对双复杂地震资料偏移成像时具有更高的精度,是复杂山前带资料高精度地震成像更理想的技术手段。

Rugged-topography reverse time migration in complex piedmont zone

Seismic survey in piedmont zone leads quite a few problems such as low S/N, severe static corrections, and complex seismic wave propagation caused by both rugged topography and complex structures. To solve the problems, we propose an approach in the paper and establish a set of seismic imaging processing flows based on "true-surface" seismic imaging plane and high frequency static corrections. The core of the flows is the depth domain velocity model building and inverse time migration on rugged topography surface. Both wave field continuation and imaging are implemented for the true rugged topography surface. Long wavelength static corrections are solved in migration imaging process, to better deal with the complex seismic imaging in piedmont zones. Test results on model and field data show that the proposed approach can better deal with seismic imaging in rugged topography and complex structure areas, and is an ideal way for seismic imaging in complex piedmont zones.