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Abstract
The Greater Ughelli Depobelt within the Niger Delta Basin represents a mature hydrocarbon province where precise lithostratigraphic, biostratigraphic, and source rock characterizations remain critical for mitigating exploration risks. This study presents a comprehensive evaluation of the ABC-1 well, combining sedimentological analysis, microfossil biostratigraphy, and organic geochemistry to reconstruct the paleoenvironment, establish a chronostratigraphic framework, and assess the oil and gas potential. Lithological analysis of ditch cutting samples reveals a classic deltaic succession belonging to the Agbada and Akata Formations, characterized by alternating sequences of sandstones, siltstones, and marine shales. Biostratigraphic dating, utilizing index planktonic foraminifera and palynomorph assemblages, indicates an age range from Late Oligocene to Early Miocene. Identified biozones correspond to specific global chronostratigraphic markers, allowing for the delineation of major maximum flooding surfaces (MFS) and sequence boundaries (SB) that define the structural and stratigraphic traps within the depobelt.
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