LSPSM/inversion for pre- and poststack time lapse studies
Abdolnaser Yousefzadeh, John C. Bancroft
The ability of separate and joint LSPSM/inversion of time lapse data is shown. Assuming similarity of the acquisition instruments, environmental noise, near surface effects, and processing flows and parameters for both, baseline and monitor surveys, difference in acquisition geometries leaves different artifacts at the migration images. It is shown how separate LSPSM of both, baseline and monitor, datasets can attenuate acquisition footprints and create reliable time lapse images. The reconstructed data from two surveys makes the prestack time lapse studies more feasible. Formulations of the joint inversion of time lapse data to invert for the baseline image and time lapse image by LSCG method are derived.