Petrophysical characterization of hydrocarbon reservoirs in the H-Field, offshore Niger delta

This study evaluates the hydrocarbon reservoir potential of the H-Field, located offshore in the Niger Delta, by integrating wireline well log data with modern modeling techniques. The primary objective was to characterize subsurface reservoir properties and estimate hydrocarbon saturation across the field to reduce uncertainty in future development planning. Using Petrel 2017 software, geophysical logs—including Gamma Ray, Resistivity, Density, and Neutron logs from four wells were analyzed to delineate lithology and determine critical petrophysical parameters. Lithological analysis identified four distinct reservoir zones (Sands A–D) consisting of alternating Sand-shale sequences characteristic of the Agbada Formation. Quantitative results indicate high reservoir quality, with net-to-gross ratios ranging from 83.77% to 98.42%. Sand C exhibited the highest average porosity (46.21%) and hydrocarbon saturation (18.52%), while Sand D recorded the highest average permeability (10,312.75 mD). Resistivity log responses confirmed hydrocarbon-bearing intervals across all delineated zones. The study demonstrates that multi-well correlation effectively quantifies lateral reservoir continuity and identifies petrophysical heterogeneities, such as anomalous porosity in Sand C. These findings highlight the H-Field’s significant potential for hydrocarbon development and provide a granular validation of reserves essential for production optimization in offshore environments.