Pakistan Journal of Geology (PJG)

Journal: Pakistan Journal of Geology (PJG)
Author: Anwana, U. E., Akpabio, Idara O.

This is an open access journal distributed under the Creative Commons Attribution License CC BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited

DOI: 10.26480/pjg.01.2025.41.48

Investigation of the change in grain size distribution, pore fluid and lithologic association with respect to the influence of depositional environment was adopted to ascertain its imperativeness to hydrocarbon recovery. Suite of well logs (resistivity, gamma ray, density and neutron) from three wells, SB1, SB2 and SB3 were used to delineate lithologies and grain size distributions; identify fluid contact and volume of shale. Lithology and litho-fluid cross-plots show variability in lithofacies, while the two porosity logs (density and neutron) were used to compute porosity. In the three wells, the identified facies (funnel, cylindrical and bell shape trends)and litho-fluid cross-plot show gamma ray values ranging from 30 to 60 API; high resistivity values up to1123 Ω-m; mean porosity value of 22% to 32%; mean shale volume of 0.06 to 0.24. The results show a good to excellent reservoir properties capable of supporting hydrocarbon exploration and production. The intermittent variability in lithofacies of coarsening upward and downward and lithologies is not unconnected with the discrete velocities of different grain sizes during transportation and subsequent differential drag forces during deposition. The wells correlation and the results obtained have deepened the sedimentological and stratigraphic knowledge of reservoir quality and continuity as a proof of good prospect.