Petrophysical Evaluation of Cape Three Points Reservoirs

Abstract

The findings of a study to ascertain and assess the petrophysical characteristics of Cape Three Points reservoirs in the Western basin with a view to describe the reservoir quantitatively using W ell Logs , Petrel and Techlog . The investigated characteristics, which were all deduced from geophysical wire-lin e logs, in clude lithology, porosity, permeability, fluid saturation, and net t o gross thickness. To characterise the reservoir on the field, a suite of wire-line logs including gamma ray, resistivity, spontaneous potential, and density logs for three wells (WELL_1X, WELL_2X, and WELL_3X) from the Tano Cape Three Point basin were studied. The analyses that were done included lithology delineation, reservoir identification, and petrophysical parameter determination for the identified reservoirs. The tops and bases of the three wells analysed were marked at a depth of 1203.06 - 2015.64 m, 3863.03 - 4253.85 m and 2497.38 - 2560.32 m respectively . T here were no hydrocarbons in the reservoirs from the studies . The petrophysical parameters computed for each reservoir provided porosities of 13%, 3% and 11% respectively. The water saturation a lso determined for these three wells (WELL_1X, WELL_2X an d WELL_3 X) we re 94%, 95% and 89% respectively. These results together with the behaviour of the density and neutron logs suggested that these wells are wildcat wells.