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Analysis Study Research Paper | Geosciences and Environment | Nigeria | Volume 12 Issue 4, April 2023
Reservoir Evaluation and Depositional Environment of Sand Bodies in Welder Field - Northern Depobelt of the Niger Delta Basin
Fortune I. Chiazor [2] | Richmond U. Ideozu [2]
Abstract: In this work, reservoir sands from four oil wells in Welder Field Niger Delta, was evaluated petrophysically to determine the impact of reservoir properties to the environment of deposition. Results from the petrophysical analysis showed that the average petrophysical properties obtained for the reservoir W700 includes porosity (23%), permeability (78mD), water saturation (39%), net - to - gross ratio (9%), pay thickness of 98m and STOOIP (Stock tank original oil in place) of 84mmstb. While sand body W800 includes porosity (21%), permeability (12mD), water saturation (42%), net - to - gross ratio (9%), pay thickness of 85m and STOOIP (Stock tank original oil in place) of 62mmstb. The STOOIP value for reservoir W700 is higher than that of reservoir W800 because of the presence of thick shales at top of W800. W700 and W800 reservoirs generally show a prograding to aggradational stacking pattern as seen from the gamma ray log. Based on standard log motifs, from the gamma ray log, the environments of deposition of the reservoirs are interpreted as mouth bar, deltaic front and shore face respectively.
Keywords: Sand bodies, porosity, log motif and shoreface
Edition: Volume 12 Issue 4, April 2023,
Pages: 561 - 564