Facies and Sequence Stratigraphic Study of Bema Field, Niger Delta, Nigeria

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.