Palaeoenvironmental Reconstruction and Hydrocarbon Potential of some Mid-Upper Cretaceous and Late Eocene-Early Oligocene Sediments from Two Southern Nigerian Inland Basins: Insights from Palynology and Palynofacies
Publication Date : 24/05/2022
This study investigates the paleoenvironment and hydrocarbon potentiality of mid-upper Cretaceous and late Eocene-early Oligocene sediments from two southern Nigerian inland basins. Therefore, palynological and palynofacies analyses were carried out on 15 outcrop samples from Calabar Flank and 112 ditch-cutting samples from Dahomey Basin. The stratigraphic distribution of the palynofacies assemblage defined just one palynofacies unit with very high percentage of phytoclast and very low percentages of AOM and palynomorphs all through the samples. Palynofacies analysis of the Calabar Flank (mid-upper Cretaceous) sediments indicates deposition of their organicrich shale, calcareous shale and marl in nearshore shelf environments under dysoxic conditions, comprising mainly kerogen types I and II. On the contrary, Dahomey Basin (late Eocene-early Oligocene) sediments signifies deposition of organic-rich shale in shallow marine shelf environments under dysoxic–anoxic conditions containing mainly kerogen of types I and III. The Calabar Flank and Dahomey Basin Sediments that are characterized by kerogen types I and II, and types I and III, respectively, have capability to generate gas at depth. The findings in this present study will be useful in understanding the depositional environments and hydrocarbon potential of Calabar Flank and Dahomey Basin regions.
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