Assessment of the Reservoir Qualities of the Cretaceous Yolde Sandstone around Dadin Kowa and Briyal. Gongola Sub-Basin. Northern Benue Trough. North East Nigeria
Abstract
Sedimentology, petrography and petrophysical studies were applied to the Cretaceous Yolde Formation sediments around Dadin kowa and Briyal, to evaluate its reservoir quality. The Yolde Formation round Dadin kowa is about 4.5m (Jangargari), 3m (Wuro gari) and Briyal 15m. The Sandstones are structurally characterized by planar, tabular and trough cross-beds, , and hummocky cross-stratifications Grainulometric analysis shows that the sandstones are moderately sorted to moderately well sorted ( 0.60- 0.71)?I, the grains sizes are very fine to medium (3.4- 1.73)MZ Leptokurtic to very leptokurtic (0.9-1.9)KG and are coarse to strongly fine skewed (- 0.04-0.15)SKI. Petrographic analysis shows that the sandstone samples are texturally matured. The Quartz grains are both monocrystalline and polycrystalline in nature while thesub-rounded to rounded nature of the grains suggests that the sediments were transported from a long distance. The framework components of the sandstonesbased on the QFR plot shows that the sandstones are Quartzarenite, Sublitharenite to Litharenite and Subarkorse to Arkosic in nature. Grainulometric analysis showsThe petrophysical evaluation indicated porosity values ranging from 5% (moderate) to 29 %( high), and permeability values between 83.27(low) to 507.1(high). These values when compared to the reservoir rocks of proven petroleum basins of the North Sea and Niger Delta. Therefore, the Yolde Sandstones of the study area can have great potential to serve as good reservoir rock in the Gongola Basin.
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