--> Integrated Subsalt Velocity Model Building in the Central Gulf of Mexico
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AAPG/SEG International Conference & Exhibition

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Integrated Subsalt Previous HitVelocityNext Hit Model Building in the Central Gulf of Mexico



An integrated workflow was devised to build a Previous HitvelocityNext Hit model over 2,000 Outer Continental Shelf blocks in the central of Gulf of Mexico utilizing Previous HitvelocityNext Hit information from more than 300 wells, guided by regional a stratigraphic framework, and constrained with a rock physics model. The model was further validated through iterations of 5D subsalt tomography. The resultant earth model is consistent with the Previous HitvelocityNext Hit trends at well locations, honors wide-azimuth and full-azimuth seismic data, and obeys the law of rock physics. It can be used as a benchmark earth model in the central Gulf of Mexico for exploration and appraisal applications.

Construction of the earth model involves six steps: (1) stratigraphic framework construction based on regional seismic interpretation that ties to the available wells; (2) para-sequence definition within each stratigraphic unit; (3) rock physics template generation at each well location; (4) low-frequency Previous HitvelocityNext Hit trend generation through upscaling sonic Previous HitvelocityNext Hit or check shots at well location; (5) geostatistical Previous HitvelocityTop population in 3D; and (6) 5D subsalt tomography.

The final earth model was used in prestack depth migration of wide-azimuth and full-azimuth seismic data, yielding a superb result. Many real data examples from the central of Gulf of Mexico will be shown in the presentation.