快速相移插值偏移及在复杂波场成像中的应用

Quick Phase Shift Interpolation Migration and Its Application in Complex Wave Field Imaging

在海拉尔地震工区,由于构造复杂、断裂带多,常规的偏移方法很难完全实现复杂波场的偏移成像,现有的相移插值偏移方法也因计算效率较低、受速度因素的影响大而未得到广泛应用,因此对相移偏移方法进行了改进。经改进后的相移插值偏移方法提高了计算效率,能适应大倾角的偏移归位,该方法在处理高陡构造波场成像方面比45°有限差分偏移方法具有明显的优势。

Hailaer seismic work area has complex structure with many fractured belts.migration imaging of complex wave field cannot be finished by conventional migration method.Existing phase shift interpolation migration method is not widely used because of its low calculation efficiency and influence by velocity factor.This paper introduces improvement of phase shift migration method.The improved method increases calculation efficiency and can adapt migration homing of large dip.This software has more advantages than 45℃ finite difference migration method in processing wave field imaging of highly abrupt structure.