Addressing anisotropy in 3-D prestack depth migration: A case study from the Southern North Sea

Abstract

This is a case study of a 3-D anisotropic prestack depth migration (APSDM) of data from Block L10 of the Dutch sector of the North Sea. Producing gas reservoirs in L10 are typical of the area in that they are contained in horst and tilted fault blocks of the Rotliegend Formation. Imaging these fault blocks is made difficult by a complex overburden greatly influenced by salt tectonics. In particular, the overburden includes chalk characterized by fast velocities and a strong vertical velocity gradient.