--> Abstract: Recognition of Major Debris Flow and Turbidite Depositional Patterns Using 3D Seismic Facies Analysis in Deepwater Sediments in Offshore Brunei Darussalam, by Angus J. Ferguson, Arnold Bouma, Lauti Santy, and Sofiana Suliaman; #90039 (2005)

Datapages, Inc.Print this page

Recognition of Major Debris Flow and Turbidite Depositional Patterns Using 3D Seismic Facies Analysis in Deepwater Sediments in Offshore Brunei Darussalam

Angus J. Ferguson1, Arnold Bouma2, Lauti Santy3, and Sofiana Suliaman4
1 Universiti Brunei Darussalam, N/A, Brunei
2 Louisiana State University, Baton Rouge, LA
3 N/A, Jakarta, Indonesia
4 Schlumberger Oilfield Services, Kuala Lumpur, Malaysia

A 3D seismic survey covering an area of 10,000 square kilometers has been used to image the deepwater basin in-fill sediments in offshore Brunei Darussalam. The seismic facies and sequence stratigraphy were first defined in two separate smaller areas of approximately 650 sq. km. each. The individual areas were correlated together by regional distinctive horizons to compare the seismic stratigraphic units in each area and to identify regionally significant depositional patterns. The more landward sedimentary package has been influenced by the development of the toe-thrust cored structures resulting in isolated basins of ponded sediments. The second area is more basinward and the sediments record the regional tectonic scale events that have resulted in large areas of mass movement. Four units are identified that show different reflection patterns. Unit I is a debris flow deposit with a high content of coherent blocks. Unit II is a channel and depositional lobe complex controlled by structural development that resulted in confined flow of the turbidite currents. Unit III represents fine-grained turbidites from unconfined flow, and the basal, unit IV is a debris deposit with a lower content of coherent blocks. The two debris flow units, unit I and unit IV have different directions of propagation. This indicates a change in sediment flow direction from the ancient Baram Delta into the Northwest Borneo Trough.

AAPG Search and Discovery Article #90039©2005 AAPG Calgary, Alberta, June 16-19, 2005