Predrill pore-pressure prediction using seismic data

摘要

A predrill estimate of pore pressure can be obtained from seismic velocities using a velocity-to-pore-pressure transform, but the seismic velocities need to be derived using methods having sufficient resolution for well planning purposes. For a deepwater Gulf of Mexico example, significant differences are found between the velocity field obtained using reflection tomography and that obtained using a conventional method based on the Dix equation. These lead to significant differences in The predicted pore pressure. Parameters in the velocity- To-pore-pressure transform are estimated using seismic Interval velocities and pressure data from nearby Calibration wells.