Abstract

Exploration in Dhansiri Valley is very challenging because of the complex fault systems obscuring the imaging targets which are difficult to resolve in conventional time imaging processing techniques. This paper presents a case study of 3D seismic data covering North of Borholla to Merapani area of Dhansiri Valley characterized by intersecting fault system. The isotropic 3D PreSDM depth migration carried out on this dataset has resulted in improved imaging of subsurface consistent with geological setting. The depth migration has helped in better understanding of fault kinematics that could minimize exploration risk in the study area. We have used an iterative approach through global depth tomography for velocity depth model refinement before a final PreSDM