Integration of 3-D Seismic and Well Log Data for Structural Interpretation and Hydrocarbon Reserve Estimation in the “Becky” Field, Onshore Niger Delta Basin, Nigeria

Abstract

Accurately, estimating hydrocarbon reserves in a field is essential to determine its economic potential. Therefore, it is crucial to conduct structural interpretation of 3-D seismic data to understand subsurface faults and reservoir geometry comprehensively. In this study, structural interpretation of 3-D seismic data and petrophysical characterization of reservoirs in the “Becky" field onshore Niger Delta Basin was done. The zones of hydrocarbon-bearing reservoirs in the field are located at depths of around 10 to 12 km and are found beneath the Benin Formation, with good petrophysical properties. The main structures seen on the 3D seismic sections were growth faults that have deformed the anticlines hosting the hydrocarbons, resulting in a fault-assisted anticline (3-way closure) trapping system at depths of around 9 to 12 km. Appropriate equations were used to calculate the GIIP and STOOIP, and the total volume of oil in the field is 386,255,807 barrels, and the total gas volume is 1,810,308,838 standard cubic feet. The application of qualitative well log analysis and 3D seismic structural interpretation has proven effective in delineating the architectural characteristics of reservoir units as well as estimating the hydrocarbon reserves in the field. These findings can be valuable in further exploration and development activities in the Niger Delta Basin, Nigeria.