Well Performance Evaluation Using Reservoir Property Distribution of an X-onshore Oil Field in Parts of Niger Delta, Nigeria

Using the reservoir property distribution of the well logs, this study evaluates the well performance of three wells: wells-13, 26 and 30 of the X-onshore oil field, which is located in parts of the Niger Delta, Nigeria. According to the lithological scrutiny of this study, the reservoirs are primarily located in the sand bodies, and the recognised lithology in the field consists of the intercalation of sand and shale lithofacies. Three significant reservoirs were found and correlated across the three wells in order to define the hydrocarbon bearing zones. Well-13 has a shale volume ranging from 10–15%, 21–23% for effective porosity, 1373-1974mD for permeability, 75–90% for water saturation, 10–25% for hydrocarbon saturation, and 0.8819–0.9349 for net-to-gross thickness, according to the results of the evaluated petrophysical properties in each of the correlated reservoirs. Well-26 has a shale volume of 12–14%, an effective porosity of 22–26%, permeability of 1216-24144mD, water saturation of 25–30%, hydrocarbon saturation of 70–75%, and a net-to-gross thickness of 0.8409–0.9341. In contrast, Well-30 has a shale volume of 9–14%, effective porosity of 24–28%, permeability of 1618-2950mD, 6–20% for water saturation, hydrocarbon saturation of 80–84%, and a net-to-gross reservoir thickness of 0.9365–0.9785. The porosity and permeability range showed that the reservoirs are free siliciclastic reservoirs. The analysis of the findings of this study shows that Well-30 has more hydrocarbon potential and well performance in the field due to its better petrophysical property disposition. This is followed by well-26 and well-13.