Lithological and geochemical characterisation (Rock-Eval pyrolysis) of the KOUM-1X and ABENA-1X wells on the western margin of the Côte d'Ivoire sedimentary basin

This study focuses on the lithological and geochemical analysis of 99 rock core samples from two boreholes (KOUM-1X and ABENA-1X) located on the western margin of the Ivorian sedimentary basin. It aims to reconstruct and characterize the formations to assess the petroleum potential of the various intervals in the Albian-Paleocene sequence crossed by each borehole. The results primarily show a succession of sands and clays with occasional limestone intercalations. Geochemical analysis using the Rock-Eval method indicates that the distribution of total organic matter content relative to depth in the KOUM-1X borehole ranges from poor to excellent. In contrast, the distribution in ABANA-1X ranges from poor to very good. These data, combined with the hydrogen index (HI) as a function of depth, highlight the presence of type II, III, and II/III hydrocarbons in the wells. Furthermore, the variation in oil potential (S2) with depth shows values ranging from poor to excellent in the KOUM-1X well and from poor to very good in the ABANA-1X well. Since the organic matter is immature in the formations within the study area, no potential source rock has been identified.