The "X" field is prospective but largely underdeveloped as only four vertical wells have been drilled. The purpose of this project was to prepare a field development plan by building a 3D static geologic reservoir model and estimating the in-place hydrocarbon volumes, simulating the static model to understand how the reservoirs would perform with time and building a 1D Mechanical Earth model to understand wellbore stability. The geological consistency of this model required a cross domain integration of seismic data, well log data and subsurface knowledge across the various subsurface disciplines. Three reservoirs were mapped and well correlation was carried out across the four wells (W–E). Depositional environments were reconstructed using well log information and other available geologic information. Three major lithofacies were interpreted: sands of the upper shoreface, sand-silt-shale intercalation of the lower shoreface, and marine shales. The result from the petrophysical analysis and property modeling showed that the average porosity is approximately 30%, permeability is majorly around 100mD and water saturation range from 0.347-0.461%. In-place volume estimated using the model generated was 568 MMSTB of oil. The model was simulated using different scenarios to forecast field performance. From the 1D Mechanical Earth Model (MEM) constructed, it was observed that the dominant stress regime of this field is typical of normal faults and the orientations of these stresses are in harmony with the regional stress regime of the Niger Delta. By using 1D MEM data, wellbore stability analysis for problematic layers was performed and the optimum mud weight was recommended to prevent common drilling problems and at the same time to maintain stable wellbore.
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