Biostratigraphy of the Akukwa-2 and Nzam-1 Wells in the Anambra Basin, Southeastern, Nigeria

Abstract

 This study presents a comprehensive biostratigraphic analysis of the Nzam-1 and Akukwu-2 wells in the Anambra Basin, southeastern Nigeria. It aims to determine the age, biozonation and paleoenvironment of the sedimentary succession penetrated by the two wells using palynological analysis. In this study, 17 samples from Nzam-1 (9) and Akukwa-2 wells (8) were subjected to palynological analysis. Based on the result of the studied samples, a total of nine (9) palynological zones are identified (6 in Nzam-1 and 3 in Akukwu-2 well). This provides a framework for correlating the palynomorphs across the wells in the basin, as it also reveals a diverse assemblage of forms (pollen, spores, and dinoflagellate cysts). Palynological study indicates that the sedimentary succession in the Nzam-1 and Akukwu-2 wells ranges between the Late Cretaceous to Paleogene periods based on the occurrence/assemblage of palynomorphs such as Echitricolporites spinosus, Wetzeliella sp., Longapertites spp., Afropollis jardinus and Milfordia spp. The presence of these fossils also suggests that both wells have the same environment of deposition (Marine Environment), which can support hydrocarbon generation.