This work presents results of analysis of 3rd order sedimentary Megasequence of Cenomanian- Lower Senonian in two wells in Môyo block located on Abidjan margin in Côte d'Ivoire. It is based on the logging and sedimentological data supported by few biostratigraphic data. This analysis helped to discriminate systems tracts of lowstand systems tracts, Transgressive systems tracts and Highstand systems tracts in the depositional megasequence. The lithology of this Megasequence consists of interbedded sandstone and sand within clay formation. Lowstand Systems Tracts are rich in sand and sandstone and accumulated in an environment extending from coast to mid-continental shelf.
The sedimentological and palynological study of 232 samples of cuttings from two servey drilled in the eastern ivorian coastline allowed us to characterize the aquifers of early Miocene. It falls within the context of the national drinking water supply from aquifers of the sedimentary basin in the said areas. Sedimentation consists of two facies (the quartz sands and clays). The predominance of subrounded to shiny and rounded grains reflect an aquatic transport of a relatively more or less long journey. Quartz subrounded grains, yellow orange and foxed show the presence of an oxidation and the mats grains reflect a transport by the wind. The granulometry study shows a dominance of sigmoidal facies
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