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Well-Based Quantitative Reservoir Characterization of Eocene Sokor-1 Formation, Termit Basin, Niger

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Document pages: 11 pages

Abstract: The Eocene Sokor1 Formation is proven oil reservoirrocks in the Termit sub-basin. These sandstone intervals are deeply buried,highly heterogeneous in character and characterized by Low Contrast LowResistivity (LCLR) log responses. Petrophysical and quantitative well-basedrock physics interpretations were integrated for property estimations, fluidand lithology typing in reservoir characterization. Six (6) reservoir sandstoneintervals were identified, delineated and correlated across five (5) wells. Theestimated petrophysical properties showed that the Eocene Sokor1 sandstoneshave averagely good reservoir properties with sand 5 interval exhibitingexceptional reservoir properties. Vp Vs vs. AI and μρ vs. λρ elastic cross-plots color coded withreservoir properties (Vsh and Φ), show distinct and wellseparated data clusters signifying hydrocarbon bearing sandstones, brinesandstones and shales mudstones in the 3D crossplot planes with varying seismicelastic property values in each well thereby, enhancing reservoircharacterization and providing information’s about the burial history,reservoir quality and property distribution in the sub-basin. The analysis suggeststhat, although the reservoir interval has averagely good petrophysicalproperties in all wells, the seismic elastic crossplots show that theseproperties are much better distributed in wells 2 and 3 than in wells 4, 5 and9. Therefore, sand 5 reservoir interval in wells 2 and 3 is likelyto be more hydrocarbon bearing and productive than wells 4, 5 and 9 in thesub-basin.

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