Abstract

That accurate depth conversions reduce risk is not a new concept. The challenge lies in the proper selection of velocity data and model types that will generate accurate depth maps for evaluation and drilling of prospective areas.

Velocity information is available from a number of different sources. Well velocity data are available from checkshots, vertical seismic profiles, sonic logs and geological tops. Seismic imaging velocities (stacking and migration) are interpreted from various seismic processes (2D/3D DMO, 2D/3D Prestack Time and Depth Migration) of the seismic data.

The type of model (imaging or depthing) and procedure selected is influenced by available data, lithology and the geophysical acquisition and processing parameters.

Our example illustrates the prospect resolution benefits using all available velocity data for an area of interest. We will also show the refinement gained by integrating other interpretations such as a seismic-derived fault interpretation and a salt configuration from a 3D-gravity model.