ABSTRACT
This research investigated subsurface maps and their applications in the oil industry. Utilizing an integrated approach, seismic and geological data were used to map and evaluate the Enena field's S30, T40, U50, and V60 reservoirs, estimating reservoir characteristics, fluid distribution, and constructing a 3D model. This study emphasized integrating petrophysical and structural data to create an algorithm using Guassian random function simulation for static modeling. The resulting static model was then used to determine the volumetric distribution of the field. The resulting 3D static model demonstrates that S30, T40, and V60 reservoirs hold STOOIP values of 51.3, 15.1, and 17.1MBO, respectively, with recoverable reserves of 18, 5.3, and 6 MBO given a primary recovery factor of 0.35 and 33.5, 9.8, and 11.1 MBO using a 2P recoverable reserve of 0.65. The GIIP was calculated to be 28, 8, and 9 BCF of gas, with P1 recoverable reserves of 18.2, 5.2, and 5.85 MBO at a recoverable reserve of 0.65 and 2P reserves of 22.4, 6.4, and 7.2 MBO at a recoverable reserve of 0.8. Because the U50 reservoir was entirely water wet despite its substantial sand package seen on the GR log, STOOIP and GIIP were not determined for it. The S30 reservoir proved to be the most productive in both oil and gas scenarios. Thick to thin shales divide the individual sands and their subunits. It was also determined that water drive is the natural drive mechanism for the Enena field, making it ideal for marginal field operators.
