Petrophysical characterization and 3D seismic interpretation of reservoirs in the Baris Field, onshore Niger Delta Basin, Nigeria

Abstract

In order to evaluate the petrophysical properties, characterize the structural framework and determine the hydrocarbon in place of potential reservoirs in the Baris Field, onshore Niger Delta Basin, Nigeria, 3D seismic and well log data from the field were collected and interpreted using Geographix and Petrel software. Two reservoir zones B2 and B5 were identified having porosity ranging from 21% to 22%, permeability from 235 to 523 mD and water saturation from 16% to 28%. Petrophysical parameters show that the two zones are good reservoirs and highly petroliferous. Seismic interpretation revealed the presence of six listric faults, two major faults (F1 and F2 trending in the northwest–southeast direction) and four minor faults (F3, F4, F5 and F6). Faults 3, 4 and 5 trend in the same direction as the major faults, while fault 6 trends in the northeast–southwest direction. Two major horizons were identified, and they correspond to the two reservoir tops (B2_top and B5_top). Roll-over anticlinal structures between the two major listric faults were identified. The depositional environment of the Reservoirs B2 and B5 have been deciphered to be of a barrier bar or crevasse play and the trapping mechanism in the Baris Field is a four-way structural closure. STOOIP and GIIP for the two zones have been estimated with the zone B5 more prolific with a STOOIP and GIIP of 7.98MMSTB and 12.77MMMSCF respectively.