Abstract
This study was carried out to quantify uncertainty in the reserve estimate of hydrocarbon in the reservoirs of AD Field, offshore, Niger Delta. Three Dimensional (3D) seismic data and log suites of seven wells (AD1 to AD7), gamma ray, resistivity, neutron and bulk density logs, well deviation and checkshot data in AD Field acquired from companies in the area. Twelve faults (Fault1 to Fault12) were identified from seismic structural interpretation while Six hydrocarbon-bearing sand intervals (Sand A - F) were delineated from the petrophysical analysis. The sand intervals thin-out basin wards, suggesting a prograding sequence. The porosity of the sand intervals ranges between 0.19 and 0.32, implying good to excellent porosity. The water saturation values ranged from 0.19 to 0.39, indicates a prospective accumulation of hydrocarbon. Sand A reservoir had the largest accumulation of hydrocarbon in-place with hydrocarbon pore volume of 2343 106 Reserve Barrel (RB), Stock Tank Oil-Initially-In-Place (STOIIP) of 175 MMbbl and gas initially-in-place of 0.30 TCF. The coefficient of variation in the reserve estimates of the reservoirs ranged from 0.09 to 0.15 indicating very low uncertainty of substantial hydrocarbon reserve that could be exploited.
Highlights
The Niger Delta basin is located in the Gulf of Guinea and represents one of the major Delta systems in the world (Figure 1)
Sand A reservoir had the largest accumulation of hydrocarbon in-place with hydrocarbon pore volume of 2343 106 Reserve Barrel (RB), Stock Tank Oil-Initially-In-Place (STOIIP) of 175 MMbbl and gas initially-in-place of 0.30 trillion cubic feet (TCF)
The Niger Delta accounts for 2% to 5% of the present day sedimentary basins on earth with hydrocarbon reserves above 34.5 billion barrels (STB) of oil and 93.8 trillion cubic feet (TCF) of recoverable gas [3]
Summary
The Niger Delta basin is located in the Gulf of Guinea and represents one of the major Delta systems in the world (Figure 1). The evaluation of hydrocarbon resource involves the integration of petrophysical interpretations from well log data with the structural interpretations from seismic data. This combination study would help to quantify subsurface hydrocarbon resource, identify the hydrocarbon prospects, leads, resource ranking, quantify uncertainty as well as provide information for well development [5].
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