Abstract: Deepwater Tertiary Turbidite Channel Exploration Plays, Block 14, Offshore Cabinda, Angola

Barrett, Michael; Ruiter, Adrian; Schirmer*, Tad - Chevron; Kapela, Pedro - Sonangol

A Tertiary regional study based upon a 1995 2D dataset, was completed in January 1996. February 1996, 850 sq. kms of high quality 3D seismic data were delivered for interpretation. Major sequence boundaries and a structural framework were quickly interpreted for the 3D volume. However, stratigraphic prospecting by sequence was the key element in the exploration effort so far in Block 14. By careful flattening of the seismic cube on key sequence boundaries and time slicing through the flattened volume, the depositional morphology of the Miocene turbidite system can be determined. 3D visualization further enhances the clarity of the pseudo-paleogeographic reconstruction. The system is highly channel dominated. The ability to clearly identify the complex meandering geometries and use of seismic facies and attribute analysis of the 3D seismic, enable well placement decisions to be made with efficiency. Key play elements have been identified and are critical to risk reduction. With this approach, Block 14 has enjoyed 100% drilling success for the first three exploration wells. Acquisition and interpretation of new 3D data in deeper water portions of the Block (500-1500m), will reveal the morphologic changes of the system in it's basinward transition. Superimposition of sand rich fairways on structural closures produced by salt diapirism and gravity driven, deep-seated toe-thrusts, combine to produce the exciting exploration plays of the future.

AAPG Search and Discovery Article #90933©1998 ABGP/AAPG International Conference and Exhibition, Rio de Janeiro, Brazil