Richard Ayobami Alakuko, Moses Olanrewaju Falowo

The KUKO offshore field in Niger Delta exhibits complex structural deformation and faulting, impacting the exploration and development of reservoirs due to uncertain properties. This study employs an integrated approach combining 3D seismic, well logs, and reservoir modeling to characterize the field. The study is centered on establishing a template for future research, evaluating petrophysical properties, investigating structural styles, and constructing a 3D static reservoir model. Three hydrocarbon-bearing sand units (KUKO A, KUKO B, and KUKO C) were correlated across five wells using composite well log suites. Eight faults, including significant crestal faults (F2, F5, F7, and F8), were identified and interpreted from seismic data. Petrophysical results indicate favorable reservoir qualities with average effective porosity of 25% (KUKO A), 27% (KUKO B), and 24% (KUKO C), and average Net to Gross (NTG) values of 86% (KUKO A), 83% (KUKO B), and 80% (KUKO C). Hydrocarbon saturation averages 61% (KUKO A), 52% (KUKO B), and 58% (KUKO C). Estimated STOIIP and recoverable oil volumes are as follows: KUKO A (STOIIP: 642 MMbbl, Recoverable oil: 1901.9 MMBL), KUKO B (STOIIP: 590 MMbbl, Recoverable oil: 1418.5 MMBL), and KUKO C (STOIIP: 549 MMbbl, Recoverable oil: 349.1 MMBL). Amplitude maps superimposed on the depth-structure maps validated hydrocarbon potential, highlighting a prospect T. This study demonstrated the feasibility of integrating 3D seismic, well log data, seismic attributes, and 3D seismic, well log data, seismic attributes and 3D static reservoir modeling for accurate characterization of hydrocarbon reservoirs.

Keywords: Petrophysics, reservoir characterization, crestal faults, amplitudes, seismic attribute, Niger Delta