Abstract

Three-dimensional seismic geomorphology provides an indication of a reservoir's internal and external architecture. This furthers an understanding of depositional processes and allows a prediction of fluid flow during hydrocarbon production. Seismic images of four fluvial reservoirs from Widuri oil field show a range of features related to point-bar accretion and stacking pattern. Lateral variations in reservoir quality and thickness follow scroll-bar patterns associated with lateral migration of a moderate- to high-sinuosity meandering river. These variations control fluid flow during primary and secondary hydrocarbon recovery. Interpreted bar and abandoned channel dimensions, compared with meander map form and wavelength, are consistent with observations of modern-day examples, which provides confidence in the depositional model. The high seismic resolution of the Widuri reservoirs provides useful analogs for other subsurface reservoirs from similar depositional environments.

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