Integration of Seismic, CSEM and Well Data in the Perdido Basin, Gulf of Mexico

Nivlet, Philippe (EMGS Services México) | Sánchez Pérez, Luis (EMGS Services México) | Escalera Alcocer, José Antonio (Pemex subdirección Exploración) | Trinidad Martínez Vázquez, José (Pemex subdirección Exploración) | Herrera, Arturo Escamilla (Pemex subdirección Exploración) | Vázquez García, Marco (Pemex subdirección Exploración) | Salazar Soto, Humberto (Pemex subdirección Exploración)

OnePetro 

Summary

This case study presents results from the Orion project within the Gulf of Mexico’s Lloyd Ridge area. Difficulties arose in updating the velocity within the Cotton Valley Formation (CVF), a thin low-reflectivity layer of shale with carbonate stringers. The prestack depth migration (PSDM) common-image gathers (CIGs) and stack displayed noticeable undulations. To reduce the undulations, an offset-dependent residual moveout (RMO) picking technique was combined with high-resolution tomographic inversion to update the velocity model. The combined work flow resulted in a higher resolution velocity model, which enhanced the gather flatness and reduced the undulations of the event beneath the CVF layer.

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