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However, the stratigraphic schemes that have been existed in Neogene succession of this basin are inconsistent for the low degree of geological study. A new high-fidelity view and detailed interpretation of the structure, stratigraphy and basin evolution of the Lake Albert rift was presented by using seismic reflection data, as well as gravity modeling, and seismic correlations to existing exploration wells in the basin (Macgregor, 2015, Nicholas et al., 2015). Lake Albert, the northernmost lake in the western rift valley, has been the subject of exploration activities for many years and a considerable quantity of hydrocarbons is discovered.
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The western rift valley of the Cenozoic East African rift system (EARS) contains a string of ancient lakes that have been studied as modern analogs for lacustrine hydrocarbon systems in the rock record (Karp et al., 2012). This paper highlights the integration of various data and comprehensive steps of building a consistent representative 3D geocellular fan delta model used for numeral simulation studies and field development plan. Furthermore, porosity and permeability were modeled using sequential Gaussian simulation (SGS) honoring core observations and petrophysical interpretation results.ĭespite the poor seismic is not supported to give enough information for fan delta sand distribution, creating a truly representative 3D geomodel is still able to be achieved. The resultant 3D facies distributions showed that the distributary channels flowed from east bounding fault to west flank and overbank was adhered to the fringe of channels while mouthbar located at the end of channels. At the same time a body facies parameter was created to indicate the connectivity of the reservoir sands.
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Lacustrine shales were modeled as background facies and then in turn eroded by distribute channels, overbank and mouthbar respectively. The facies modeling followed a hierarchical object-based approach conditioned to multiple trend constraints like channel intensity, channel azimuth and channel width. Sedimentary forward simulation and basin analogue were applied to analyze the spatial distribution of facies configuration and then a conceptual sedimentary model was constructed by combining with core, heavy mineral and palynology evidences.Ī 3D geological model of a 120 m thick stratigraphic succession was built using well logs and seismic surfaces based on the established sedimentary model.
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Limited by the poor seismic quality and few wells, it is full of challenge to delineate the distribution area and patterns of reservoir sands. The stratigraphy of this succession is composed of distributary channels, overbank, mouthbar and lacustrine shales. The early Pliocene fan delta complex developed in the south of Lake Albert Basin which is located at the northern end of the western branch in the East African Rift System.