Journal of Geology & Geophysics
Open Access
ISSN: 2381-8719
ISSN: 2381-8719
Unyime Ezekiel Ukpong*, Anthony Aniekan Akpan-Usese, Samuel Izama Ugar, Chiedozie Vincent Ekowu
In this work, 3D seismic data and wireline logs have been integrated to carry-out the optimum hydrocarbon exploration in order to delineate and assess the viability of the available petroleum prospects for proper planning of exploitation programmes in the “USOR” field. The field, which covers an area of 178 km2, is located onshore, on the coastal swamp depobelt of Niger delta. The standard method of identifying reservoirs and correlation based on log pattern, petrophysical analysis of the reservoirs, generation of synthetic seismograms, seismic-to-well tie and delineation of reservoir tops and bases as seismic horizons on seismic volume, fault mapping, generation of timeand depth-structure maps from the mapped horizons, delineation of prospects, modeling of reservoir petrophysical properties and volumetric analysis were employed. Three vertically stacked reservoirs (UR1 to UR3) were identified. Nine growth faults (F1 to F9) were mapped from which faults model have been generated. Time and depth-structure maps were generated from the mapped horizons of reservoir tops where three already drilled proven reserves and four new prospect areas (UR1(A), UR2(A), UR3(A) and UR2(B and C) and UR3(B and C), respectively) have been identified based on structural closure aided by maximum amplitude and average energy seismic volume attributes. The three reservoirs were modelled for its petrophysical properties and have been shown to be good to very good. Volumetric analysis, where both the deterministic and probabilistic (using Monte Carlo simulation method) approaches, of the identified proven reserve and prospects gave (unrisked) volumes of Gas Initially in Place (GIIP) of 570 MCF for deterministic and 1269.54 (P10), 828.17 (P50) and 344.22 (P90) MCF for probabilistic assessment. The Stock-Tank Oil Initially in Place (STOIIP) range from 71 to 541 MMSTB for the deterministic and 116 (P90) to 1260.09 (P10) for the probabilistic approach.
Published Date: 2025-10-23; Received Date: 2024-10-14