INTEGRATION OF SEISMIC ATTRIBUTTE AND SEDIMENTATION CONCEPT FOR PALEOGEOGRAPHIC AND SAND DISTRIBUTION MODELING IN SENG-SEGAT FIELD, BENTU BLOCK, CENTRAL SUMATRA BASIN

摘要

Reservoir occurrences and distribution drivernstrategy and development concepts for oil and gasrnfields. Therefore, it is important to identify therndistribution of reservoir zones. For the B-6 and B-5rnsand reservoirs in the Seng-Seat Field, Bentu Block,rnthis was achieved with paleo-geographic and sandrndistribution modeling. The outputs of the studyrnwere depositional environment and sedimentationrnpatterns, which were used to build the B-5 and B-6rnsand geometry and distribution model.rnThe Binio Formation is the main biogenic gasrnreservoir in the Bentu area, and the B-5 and B-6rnsands are the main reservoirs. Regionally, the BiniornFormation was deposited in a transitional coastalrnenvironment.rnData available for this study are wire-line logs, 2Drnseismic data (attribute and coherence), and pressurernsurvey data. The preliminary model was built basedrnon amplitude attribute, because gas bearing zonerncreates bright-spots on the seismic image. Thenrninversion and instantaneous frequency methodsrnwere applied to identify B-5 and B-6 distributionrnand heterogeneity. Finally, integration of the sandrndistribution map, controlled with the seismicrninversion boundary, the previous study of regionalrndepositional environment, and sand-shale ratiornanalysis, allowed the creation of a detailedrnpaleogeographic and sand distribution model of thernB-5 and B-6 reservoirs.rnThe models for the B-5 and B-6 reservoirs showrndifferent sedimentation patterns and sandrndistribution, including sand bars, tidal inlets andrntidal flats. Better understanding of B-5 and B-6 reservoirrnheterogeneity will lead to a better estimation ofrnhydrocarbon volumes, and therefore a fit-forpurposernfield development scenario for the Seng-rnSegat field.