Fluvial Reservoir Analogues in the Malay Basin: Analysis of Shallow 3D Seismic Data of Pleistocene Rivers on the Sunda Shelf
Howard D. Johnson, Faisal A. Alqahtani, Christopher A-L. Jackson, M. Rapi B. Som, Deva P. Ghosh, Wan Khairul Wan Sulaiman, 2010. "Fluvial Reservoir Analogues in the Malay Basin: Analysis of Shallow 3D Seismic Data of Pleistocene Rivers on the Sunda Shelf", Seismic Imaging of Depositional and Geomorphic Systems, Lesli J. Wood, Toni T. Simo, Norman C. Rosen
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This study focuses on the analysis of Pliocene fluvial depositional systems based on the shallow part (seabed to about 500 m) of a large (>10,000 km2), mega-merge 3D seismic dataset from the Malay Basin, Southeast Asia. The results of a detailed 3D seismic facies analysis, locally calibrated with high-resolution site survey data, will be presented. The Pliocene interval is up to approximately 500 m thick and comprises a range of seismic facies, which reflect changes in fluvial channel style and gross stratigraphic architecture. The succession has been divided into five stratigraphic units, bounded by basin-wide stratal surfaces. The expression of these fluvial systems will be illustrated in seismic sections, stratal and proportional slices, and through various 3D volume extraction displays. This will include the youngest channel complex, which forms part of a major incised valley (approximately 18 km wide and up to 90 m deep), which formed an axial drainage system along the length of the Malay Basin during the latest Pleistocene, when the whole Sunda Shelf was exposed. In other intervals, the coastal plain is characterised by a range of unconfined high- and low-sinuosity fluvial channel systems. Planform geometries and other dimensions have been documented using GIS methods in order to develop a quantitative database of the Sunda Shelf fluvial systems.
These data and other observation from the Pliocene fluvial systems are being used to determine reservoir body dimensions, geometries and estimates of connectivity that will aid the interpretation of similar, fluvial reservoirs in the deeper prospective Miocene interval.