Palinspastic restoration of velocity models used in prestack depth migration: Example from Northeast British Columbia.

摘要

An accurate seismic depth image is obtained through migrations that flatters common image gathers and focus reflectors however, there is often a range of velocities that will produce a reasonable result. The addition of geologic validation through palinspastic restoration to the prestack depth migration workflow helped constrain these velocity values to produce a more accurate result. The processing of a seismic line from the Foothills of Northeast British Columbia led to a revised interpretation with faulting as the primary deformation mechanism. The maximum amount of shortening was in the thrust-faulted Cardium and Dunvegan formations. The Dunvegan Formation was deformed with a pop-up structure related to the faulted box-fold found within the Shaftesbury through Falher formations. The Baldonnel Formation and Rundle Group were deformed through imbricate faulting.