Abstract
Facies architecture and sequence stratigraphic framework of a potential hydrocarbon Prospective Area of Bema Field, Central Swamp Depobelt, Niger Delta was investigated. This study utilized Well Logs, Side Well Samples, Biostratigraphic Data and 3-D Seismic. The study revealed four facies unites, namely, Sandstone facies (SF), Shaly-Sandsone facies (SSF), Mudsone facies (MF), and Heterolithic facies (HF). The Sequence Stratigraphic analysis of the field revealed Nine (9) stratigraphic surfaces, comprising of (Five Maximum Flooding Surfaces (MFSs) with ages ranging from 20.7 to 15.0 Ma, and Four Sequence Boundaries (SBs) with ages between 20.4 and 15.5 Ma respectively). Five Vail’s third order depositional sequences (SQ1, SQ2, SQ3, SQ4, and SQ5) and four (4) Galloway’s genetic sequences (GQ1, GQ2, GQ3 and GQ4) were recognized within the study area based on Stratigraphic Marker tops and system tracts. Hydrocarbon play assessment revealed that the HST and TST are key reservoir rocks in the study while the shale of the TST therefore forms the seal for the potential traps in the study area.
Highlights
Area of Bema Field, Central Swamp Depobelt, Niger Delta was investigated
Regional Stratigraphic Framework: The lithic fill of the Niger Delta Basin ranges from facies of the first major Cenozoic transgression to the depositional products of the present day, as well as materials eroded from subsurface and outcropping formations (Adegoke et al, 2017)
Sedimentary Lithofacies: Lithofacies identification from the Well Log classified the stratigraphic sequences in the study area into four predominant lithofacies which includes; sandstone facies, mudrock facies, shaly-sandstone facies and heterolithic facies (Fig. 5)
Summary
Area of Bema Field, Central Swamp Depobelt, Niger Delta was investigated. This study utilized Well Logs, Side Well Samples, Biostratigraphic Data and 3-D Seismic. Relevant facies information gotten for properly interpretion includes; lithology, structures, fossil content, ichnofossils, size of grains, degree of sorting, roundness, porosity, pore arrangement, and the ease at which fluids flows through these pores. These facies properties are the major determinants of excellent reservoir quality and are the building blocks in understanding the depositional environments of reservoirs. This research clearly focuses on integrating lithofacies study and seismic stratigraphy in other to accurately build a realistic sequence stratigraphic framework so as to enable prediction and placements of reservoirs, source and seal rocks within the study area. The present study apply facies architecture and sequence stratigraphic framework of Bema Field, Central Swamp Depobelt, Niger Delta, Nigeria
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