hide
Free keywords:
-
Abstract:
This study aims to build a 3D stratigraphic database based on the correlation of boreholes with logs and seismic reflection lines calibrated in terms of age, lithology, and environment. The aim of this study is to build a 3D stratigraphic database based on the correlation of logging wells and analysis of seismic reflection lines calibrated in age, lithology, and sedimentation environment from previous borehole wells. The MSBGC basin has been intensively prospected for hydrocarbons since the 1950s, both onshore and offshore. Extensive seismic reflection, gravity, magnetic and well data are available. Since 2014, major discoveries have been made in offshore Senegal, prompting interest in conducting a predictive study from offshore to onshore to identify possible continuities between the environments.Results from the lithostratigraphic investigations we undertook show a mitigated offshore-onshore correlation. This is probably due to the size of the area, the scattered wells or the geological and tectonic phenomena that have affected the basin.Petrophysical analyses obtained on some wells show that the Maastrichtian reservoirs are made up of sandstone, sandstone sand, and clayey sand. This is probably due to the major regression that occurred in the Upper Maestrichtian, which is expressed in the overlying sandstone deposits found in most wells. Maestrichtian has excellent reservoir properties with average porosities of at least 28% and high permeabilities with clay volumes below 50%.
