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Abstract
The lithology and fluid discrimination of an onshore Sody field, of the Niger Delta was studied using gamma ray, resistivity and density logs from three wells in the field in order to evaluate the field’s reservoir properties. Two reservoir sands (RES 1 and RES 2) were delineated and identified as hydrocarbon bearing reservoirs. The petrophysical parameters calculated include total porosity, water saturation and volume of shale. The results obtained revealed that the average porosity of the reservoir sands, range from 21% to 39%, which is excellent indicator of a good quality reservoir and probably reflecting well sorted coarse grain sandstone reservoirs with minimal cementation. Water saturation is low in all the reservoirs, ranging from 2% to 32%, indicating that the proportion of void spaces occupied by water is low, and implying high hydrocarbon saturation. The crossplot discriminated the reservoirs lithologies as sand, shaly sand and shale sequences, except well Sody 2 which differentiated its lithologies as sand and shale sequences and distinguished the reservoirs’ litho-fluids into three, namely; gas, oil and brine. These results suggest that the reservoirs sand units of Sody field contain significant accumulations of hydrocarbon.
 Keywords: Reservoir, porosity, net-to-gross, impedance, lithology
Highlights
The lithology and fluid discrimination of an onshore Sody field, of the Niger Delta was studied using gamma ray, resistivity and density logs from three wells in the field in order to evaluate the field’s reservoir properties
This study focuses on an onshore Niger Delta field and is aimed at using well log data to discriminate lithology and fluid properties of reservoirs discovered in the field
Lithology identification of geological beds in the subsurface is fundamental in reservoir characterization, as one cannot predict the fluid content of any geological bed without first of all knowing the lithology that the fluid is associated with
Summary
The lithology and fluid discrimination of an onshore Sody field, of the Niger Delta was studied using gamma ray, resistivity and density logs from three wells in the field in order to evaluate the field’s reservoir properties. The crossplot discriminated the reservoirs lithologies as sand, shaly sand and shale sequences, except well Sody 2 which differentiated its lithologies as sand and shale sequences and distinguished the reservoirs’ litho-fluids into three, namely; gas, oil and brine. These results suggest that the reservoirs sand units of Sody field contain significant accumulations of hydrocarbon. Successful identification of the lithology and pore fluid aids in the accurate determination of porosity, saturation, and permeability of the reservoir. To make accurate petrophysical calculations of reservoir properties such as porosity, clay volume, water saturation, permeability, net pay and reserve volume, the various lithologies of the reservoir interval must be identified and their properties understood. The economic viability of a hydrocarbon field is dependent on the quality and accurate determination of the lithology and pore fluid of the reservoir (Short and Stauble 1965; Crain 1986)
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