Prestack Depth Migration (PSDM) has gained wide spread acceptance as a tool of choice for seismic imaging in geologically complex areas. Its ability to honor lateral velocity variations gives geophysicists greater confidence in the precise location of their drilling targets on their image than they can possibly have using prestack time migration (PSTM).

The first key to seismic imaging in depth is to build a good velocity model which is described in velocity model building. Once an accurate velocity model is established, the next most important factor to have an accurate depth image is to use proper migration algorithms and workflows. PT. GIS has different pre stack depth migration for different imaging needs in different basins with various degrees of geological complexity, depositional impact, and tectonic movements. In addition, a proper migration algorithm also needs to be amplitude preserving and consider the impact of topography, acquisition parameters, near surface conditions, subsurface dip, anisotropy, and wave propagation.

Velocity Model Building
The key to an accurate image

Through the integration of interpretation, velocity analysis, model building, model updating, model validation, depth imaging and time-to-depth conversion, PT. GIS provides the continuity needed to produce high-quality, interpretable images consistent with other available data.