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Reservoir Evaluation of Well A, Field Y, North-Eastern Niger Delta: A Case of a Problematic Sandstone

Okiotor M.E, Imasuen I.O, Etobro A.A.I

The reservoir characteristics of well A, in field Y were evaluated using data derived from both wire line logs and cores. The wire line logs were used in delineating the lithostratigraphy, facies types and consequently the depositional environment. Porosity, permeability and hydrocarbon saturation were also determined from the wireline logs and compared with those from core analysis. The logs were environmentally corrected and normalized, porosity and permeability were calculated, water saturations were determined from which the fluid contents of the reservoirs were determined. Two economically viable reservoir horizons were delineated and analysed. The results showed alternation of sand-shale sequence, good porosity and permeability. This is generally the trend in the Niger Delta stratigraphy. The values obtained for water saturation have an inverse relationship with hydrocarbons, showing that there are hydrocarbons in both reservoir horizons which would make the two reservoirs to be of economic importance. However, the results from neutron logs (which are as high as 44.5%) indicate that there are clayey materials within these sands. These were thought to be a likely source of problem in the sandstone, if they occur as montimorrillonite clay minerals. This was looked into and recommendation made.