Enhanced Reservoir Characterization of Phem Field, Offshore Niger Delta: Integration of Seismic Attributes and Reservoir Property Modeling

Abstract

This study provides a comprehensive characterization of hydrocarbon-bearing reservoirs in the Phem Field, offshore Niger Delta, integrating well logs, seismic attributes, and petrophysical modeling for enhanced exploration and production. Three key reservoirs (R-1, R-2, and R-3) were identified within the Agbada Formation, exhibiting intercalated sand and shale layers with variable thickness and significant hydrocarbon potential. Well log analyses based on gamma ray (GR), resistivity, and neutron-density (N-D) logs revealed increasing shale content with depth, aligning with the stratigraphy of the Agbada Formation. Time and depth structure maps highlighted key structural features and hydrocarbon trapping mechanisms, supported by fault-controlled anticlinal structures. Seismic attribute analysis, particularly RMS amplitude and average envelope, delineated high-amplitude zones correlating with high- porosity sands and favorable reservoir facies, providing strategic targets for exploration. Petrophysical modeling, including net-to-gross (NTG), porosity, and permeability models, confirmed superior reservoir quality in specific zones, with NTG values reaching 95% and porosity ranging from 0.12 to 0.42. Additionally, water and hydrocarbon saturation models underscored zones with strong hydrocarbon presence and minimal water content, marking promising areas for efficient hydrocarbon recovery. These integrated findings highlight the Phem Field's robust hydrocarbon potential, offering valuable insights for optimized reservoir management and future development.