Integrated Seismic and Petrophysical Evaluation of Reservoir F, DABS Field, Niger Delta Basin

Abstract

This study presents a comprehensive reservoir characterization of Sand F in the "DABS" Field, located within the coastal swamp depositional belt of the Niger Delta Basin. The primary objective was to evaluate hydrocarbon potential and delineate prospective drilling locations using integrated seismic interpretation and petrophysical analysis. The available data for this study are 3D seismic, well logs (DABS-01 to DABS-06), and checkshot data from DABS-04. The methodology used includes fault interpretation, well log correlation, time-to-depth conversion, map generation, identification of reservoirs/prospects, and volumetrics. Seismic interpretation of 21 inline sections revealed a structurally complex area dominated by listric normal faulting typical of the Niger Delta extensional regime. Seven hydrocarbon-bearing sand bodies (A-G) were delineated, with Sand F selected as the primary reservoir target based on its lateral continuity and hydrocarbon presence in wells DABS-01, DABS-04, and DABS-03. A fault-dependent structural trap with a bottom water drive mechanism characterizes the reservoir. We established the oil-water contact at a depth of −10,565 ft subsea. Volumetric analysis using depth-volume relationships estimated a gross rock volume of 35,276 acre-feet. We estimated the Stock Tank Original Oil In Place at 25.3 MMSTB and Estimated Ultimate Recovery (EUR) at 10.2 MMSTB. In addition, we identified one high-potential prospect: a northeast prospect targeting depths of −8,880 to −8,950 ft and a southeast lead at −10,560 ft. These locations were optimized based on their structural positions relative to the mapped faults and the established oil-water contact (OWC). This integrated approach demonstrates the effectiveness of combining seismic interpretation with petrophysical analysis for reservoir characterization in structurally complex Niger Delta settings, providing a robust framework for field development planning.