Biostratigraphic Zonation and Paleoenvironmental Reconstruction of UQ Field, Niger Delta, Nigeria

Abstract

The UQ Field, located in the southeastern Niger Delta Basin, is a marginal hydrocarbon-bearing field with complex stratigraphic characteristics that have hindered its full commercial exploitation. This study aims to establish a biostratigraphic framework for the UQ Field that enhances stratigraphic correlation, reconstructs paleoenvironmental conditions, and optimizes hydrocarbon exploration strategies. A biostratigraphic approach was used, integrating palynological analysis and paleoenvironmental reconstruction to delineate biozones, refine depositional models, and assess reservoir potential. Two primary biostratigraphic zones (P850 and P840) were identified based on key palynomorph markers such as Peregrinipollis nigericus and Striatricolpites catatumbus, representing a Late Miocene depositional environment. The biozones indicate a transition from lower delta plain to upper delta front conditions, influenced by marine transgressions and regressive sequences. These depositional shifts have significantly affected reservoir distribution, connectivity, and quality. By integrating biostratigraphy with hydrocarbon prospectivity analysis, this study provides crucial insights for improved reservoir characterization, well placement strategies, and future exploration within the Niger Delta. This study presents the first high-resolution biostratigraphic zonation of the UQ Field, offering a refined framework for understanding its depositional history and Paleoenvironments. This study advances existing knowledge by integrating biostratigraphy with depositional modeling, offering a more comprehensive approach to characterizing reservoir quality and connectivity. The findings provide a critical framework for future exploration efforts, guiding well placement strategies and reservoir evaluation in marginal fields within the Niger Delta Basin.