Logging and Lithostratigraphic Study of the Cenomanian-Santonian Reservoirs of Four Oil Wells MSP1, MSP2, MSP3 and MSP4 of the Margin of San-Pedro (Côte d’Ivoire)
Bié Goha René *
UFR Environment, Laboratory of Environmental Science and Technology, University Jean Lorougnon Guedé, BP 150 Daloa, Côte d’Ivoire.
Gbangbot Jean-Michel Kouadio
UFR Environment, Laboratory of Environmental Science and Technology, University Jean Lorougnon Guedé, BP 150 Daloa, Côte d’Ivoire.
Diangone Eric, Yao N’Goran Jean-Paul
UFR Earth Sciences and Mineral Resources, Laboratory of Marine Geology and Sedimentology, University Félix Houphouët-Boigny, 22 BP 582 Abidjan 22, Côte d’Ivoire.
Digbéhi Zéli Bruno
UFR Earth Sciences and Mineral Resources, Laboratory of Marine Geology and Sedimentology, University Félix Houphouët-Boigny, 22 BP 582 Abidjan 22, Côte d’Ivoire.
*Author to whom correspondence should be addressed.
Abstract
The logging and petrophysical study of four oil wells, MSP1, MSP2, MSP3 and MSP4 from San-Pedro margin of the Ivorian sedimentary basin has made it possible to evaluate the reservoir characteristics of the Cenomanian-Santonian age formations. Lithostratigraphically, this study has shown that this interval consists of clay and sandstone deposits interspersed with frequent past carbonate.
At the logging, ten (10) sandstone reservoirs are highlighted with effective porosities ranging from 16% to 21% and permeabilities from 100 mD to 1100 mD (millidarcy).
These reservoirs have very good petrophysical characteristics however their high water saturation show that they are rather aquifers. The various log gamma ray profiles of the intervals considered highlight a fluvial and marine deposition environment. Sedimentation would have started in a Cenomanian-type fluvial environment and would have continued in a marine environment marked by the accumulation of sandstone and clay under the influence of transgression and regression phases in the Turonian and Lower Senonian.
Keywords: Logging, reservoirs, lithostratigraphy, petrophysics, Ivorian basin, Cenomanian, Santonian, depositing environment.