Utilisation de l’analyse palynologique pour la reconstitution paléoenvironnementale et paléoclimatique des dépôts de l’Albien des puits Offshore du bassin sédimentaire de Côte d’Ivoire, marge d’Abidjan

This work presents the results of palynological analysis of the Albo-Cenomanian interval of two wells located on the Abidjan margin in the offshore sedimentary basin of Cote d'Ivoire. It aims to reconstruct deposition environments during this interval coinciding with the oceanic anoxic event (EAO1) recorded in the Atlantic. After classical chemical attacks with strong acids, the palynomorphs extracted from 114 cuttings samples were identified and counted. The results show that out of 9786 registered palynomorphs 5108 belong to the Y-3M well and 4678 to the Y-4M well. Quantitative analysis of spore groups, pollen grains (Classopollis, Ephedripites, Araucariacites), elateres and dinocysts revealed a predominantly continental (littoro-deltaic) depositional environment with marine incursions. This sedimentation occurred under a predominantly arid to semi-arid palaeoclimate under relatively humid conditions in some places. These palynological quantitative approaches will help to refine the deposit environment of the Albian in Ivory Coast.