CGG reduces cycle time of OBN imaging at Mad Dog

June 12, 2019

Offshore staff

PARIS Subsurface Imaging, part of CGG’s Geoscience division, has delivered what it claims is a step-change in subsalt image quality over the Mad Dog field in the Green Canyon area of the Gulf of Mexico.

Through continued investment in imaging technology and supercomputing capacity, CGG said it was able to reduce project cycle time by almost half while delivering improved subsalt images.

Fast access to high-quality images was said to enable BP and its partners to modify and optimize the ongoing drilling program.

Ocean bottom nodes (OBN) seismic data combined with full-waveform inversion (FWI), for velocity model derivation, provided this step-change improvement in imaging at the subsalt field, the company said. Project cycle time was reduced, when compared to projects where the velocity model was constructed using discrete interpretation methods.

According to CGG, FWI provided a fasttrack velocity model that facilitated a migration for depth imaging just weeks after delivery of the OBN data.