Publications

Reservoir occurrences and distribution drive strategy and development concepts for oil and gas fields. Therefore, it is important to identify the distribution of reservoir zones. For the B-6 and B-5 sand reservoirs in the Seng-Seat Field, Bentu Block, this was achieved with paleo-geographic and sand distribution modeling. The outputs of the study were depositional environment and sedimentation patterns, which were used to build the B-5 and B-6 sand geometry and distribution model. The Binio Formation is the main biogenic gas reservoir in the Bentu area, and the B-5 and B-6 sands are the main reservoirs. Regionally, the Binio Formation was deposited in a transitional coastal environment. Data available for this study are wire-line logs, 2D seismic data (attribute and coherence), and pressure survey data. The preliminary model was built based on amplitude attribute, because gas bearing zone creates bright-spots on the seismic image. Then inversion and instantaneous frequency methods were applied to identify B-5 and B-6 distribution and heterogeneity. Finally, integration of the sand distribution map, controlled with the seismic inversion boundary, the previous study of regional depositional environment, and sand-shale ratio analysis, allowed the creation of a detailed paleogeographic and sand distribution model of the B-5 and B-6 reservoirs. The models for the B-5 and B-6 reservoirs show different sedimentation patterns and sand distribution, including sand bars, tidal inlets and tidal flats. Better understanding of B-5 and B-6 reservoir heterogeneity will lead to a better estimation of hydrocarbon volumes, and therefore a fit-for-purpose field development scenario for the Seng-Segat field. Keywords : Binio, Seismic, Attribute, Reservoir, Paleogeographic.