The numerical results show that this method not only increases difference precision of temporal and spatial derivatives,but also has advantages of higher efficiency and lower dispersion compared with traditional centered finite-difference method;therefore,it can be extended to 3D scalar acoustic high-precision forward numerical simulation and post-stack reverse-time depth migration.

Wave-equation finite-element prestack reverse-time migration;

In Libu Area of Jianghan Basin, underground fault structure is complex, lateral velocity changes severely, it is very hard to obtain high-quality underground geologic information with conventional post-stack time migration.

Currently prestack time migration technology has been extended greatly, while the application result of poststack time migration is even more effective than that of prestack migration because of the high calculation efficiency and low S/N ratio in some place.

Imaging difficulties existed in 3D seismic poststack time migration,thus 3D prestack time migration carried out.

Contrast of prestack time migration and poststack time migration effects can see,the former has higher S/N ratio and resolution,its interpreted fault point and surface are clear and correct homing.