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ABSTRACT
In the context of today’s declining oil price scenario and harder to find reserves with increasing development cost, it is pertinent now more than ever, to better understand existing reservoirs so as to optimize productivity. The field of study (X field) was ReEvaluated, resource volumes were calculated and new prospects that could be matured were identified with their volumes estimated. The geological consistency of this model required a cross domain integration of seismic data, well log data and subsurface knowledge across the various subsurface disciplines namely, Geology, Geophysics, and Petrophysics. Four reservoirs were mapped from the well correlation carried out across the seven wells in the NE-SW Direction. Depositional environment was reconstructed using well log information and other available geologic information. A conceptual model was generated from gamma ray log motifs in combination with the neutron-density trend and three major lithofacies were interpreted based on the average porosity value and the volume of clay contained which are Sands of the upper shoreface, Sand-Shale intercalation of the lower shoreface and marine shales. A total of 43 Faults and 2 hydrocarbon bearing reservoirs were interpreted. Deterministic velocity model was built which was used for Time-to-Depth Conversion because it gave the least errors after the depth map was back interpolated and depth maps were generated with structures conforming to those on time maps. The result from the petrophysical analysis and property modeling has shown that the reservoirs have porosity values that range from 22-30%, and water saturation ranges from 17-57% for various Reservoir Intervals. X field is largely marginal marine sediment with great abundance of sand enabling reservoir connectivity across the field which are deltaic deposits with tidal influence. Trapping configuration is a four-way closure in the shallow reservoirs and fault dependent (2 way) closure in the deeper reservoirs. The closures are products of rollovers anticlines related to growth faults. Four hydrocarbon bearing reservoirs were identified and mapped. Base-case estimated STOIIP vary between 5MMBO and – 90 MMBO. Recommendations were made for deeper prospect to be interpreted.
