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The Well KG-5 is a vertical well drilled to evaluate an exploration prospect in the onshore “Green Field” Niger Delta. It discovered a significant oil column within the sandstone reservoir intervals. A conventional suite of wireline logs including gamma ray, calliper, sonic, density, neutron, dual laterolog and micro-SFL resistivities were acquired for formation evaluation purposes. Also two cores were cut in the reservoir interval for hydrocarbon shows analysis. The result of the formation evaluation shows that reservoir zones Q-A and Q-B contain oil while reservoirs Q-C and Q-D are water filled. The contact between the oil and water (Oil water contact-OWC/Free Water Level) is at a depth of 2464m. The net pay porosity values range between 0.139v/v and 0.165v/v with an average of about 0.158v/v. The trends of the neutron-density crossplot and the Picket plot indicate that there is a little contribution of dispersed and laminated clays in the reservoir, which would have significantly affected the poro-perm values of the reservoir intervals. Also, the net pay water saturation (0.266v/v) is reduced as compared with the net reservoir saturation (0.434v/v). And out of 8.080 equivalent pore column (EPC), 5.935 are equivalent hydrocarbon column (EHC). Because the minor claystone beds within the reservoir sands are laterally continuous and may be vertical permeability barriers; the reservoir engineers should run a separate perforation for reservoirs Q-A and Q-B. This is because the two reservoirs may not be in vertical communication due to claystone baffles. And so hydrocarbon flow would be mainly horizontal.

Formation evaluation of an onshore appraisal well ‘KG-5’, “green field”, Niger Delta, Nigeria