Volume 1, Issue 1, January - June, 2024

Hydrocarbon prospectivity of selected block wells, Southern Niger-delta, Nigeria

Ibrahim O Ibrahim^1♦, Ibrahim BD², Ngozi-Chika CS³, Adeoye AS⁴, Shaibu S⁵

¹Design and Hydrogeology Units, Lower Niger River Basin Development Authority, Ilorin, Kwara State, Nigeria
²Department of Chemistry, University of Ilorin, Ilorin, Nigeria
³Department of Geology, Dennis Osadebay University, Asaba, Delta State, Nigeria
⁴Department of Geology, Faculty of Science, Ekiti State University, Ado-Ekiti, Nigeria
⁵Department of Civil Engineering, University of Port Harcourt, Port Harcourt, Nigeria

^♦Corresponding author
Design and Hydrogeology Units, Lower Niger River Basin Development Authority, Ilorin, Kwara State, Nigeria

ABSTRACT

The block wells are located in the South-eastern Niger Delta area. It extends between latitude 4° 18¹ N and 4° 42¹N to Longitude 7° 6¹and 7º 36¹ E. Low hydrocarbon production recently recorded that led to the abandonment of the block wells is the drive towards this assessment. IN-3A, IN-4A and IN-5A wells were thus re-evaluated to shore-up the hydrocarbon production potential. Well logs, seismic, isochron data, time and depth structural maps generated from petrel platform are exploration tools for the study. Findings has shown that IN-3A has about 8 reservoir units ie BQC, AC- 1, BMS (P-4), BPS (1-1), BPS (1-2), BPS (1-3_2), (1-4) and 1-5 that constitute its play potential out of which BPS (1-3_2) and 1-5 constitute new pay sand units. IN-4A depositional sequence with 10 reservoir areas mapped out as its hydrocarbon play and include BPS (-1), BPS (1-2), BPS (1-1), 1-2, 1-3_2, 1-4, 1-5, J-1, J-2 and J-3 out of which BPS (1-1), 1-2, 1-3_2, J-1, J-2 and J-3 constitute new pay sand units mapped out with a high potential for more hydrocarbon production. Conversely, in IN-5A well, its depositional sequence revealed out of 10 reservoirs mapped out, no single pay zone was recorded. Mapped reservoirs included BMS (P-4), BPS (1-1), 1-1, 1-2, 1-3_2, 1-4, 1-5, J-1, J-2 and J-3 as such fracking will be needed to initiate new reservoir zones. The hydrocarbon producing potential of the studied wells are high due to cross linkages across the migrational conduits of the structural features in the block wells that will need little fracking. They are mostly footwall, hanging wall growth faults, anticlines and some unconformity traps with few horst and graben structures. In essence, this cross-linking fracking episode will improve on the porosity, permeability and oil saturation of the wells sediment for more hydrocarbon productivity.

Keywords: Depositional Sequence, Hydrocarbon Pay sand, Foot wall, Hanging wall and Reservoir.

Discovery Nature, 2024, 1(1), e1dn1003

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DOI: https://doi.org/10.54905/disssi.v1i1.e1dn1003

Published: 03 February 2024