Stubb Creek Marginal Oil Field In Nigeria Sedimentary Facies And Lateral Reservoir Prediction

Stubb Creek oilfield, with an area of about 42 km~2, is located in the coastal swamp between OML 14 and OML 13 in Niger Delta, Nigeria. The southern and southeastern boundaries of the field are near to the coastline. In order to break the deadlock in the Stubb Creek oilfield, on the basis of building the framework and model of sequences, distribution characteristics of the every sandbody thickness, and Microfacies of the every sandbody, analysis sedimentation microfacies of every sandbody, integrated with physical properties, Reservoir integrative evaluation.Our research group have progressed Stubb Creek oilfield research and investigation indoor in the basis of system collecting reorganization and understanding the geology inclusion explaining 3D seismic data to get some conclusions about the relationship between tectonic evolution and reservation of accumulations, building the Stubb Creek oilfield framework and the model of sequences. The stratigraphy could be divided into three third-order sequences, which was sequence SQ1, SQ2 and SQ3 from lower to upper lay.The Niger Delta, located on the passive margin of the Gulf of Guinea, is the most intensively regression deltaic system. According to sequence interpretation of high resolution, lithology features reflected by logging and their association integrated with plane distribution laws of reservoir sandstone, the sedimentary facies include incised canyon infilling, delta, shore, and continental shelf and so on in Stubb Creek marginal oilfield. The facies association from northern to southern presents delta, incised canyon infilling, shore, continental shelf, and in high stand tract the sedimentary facies association presents delta plain, mouth bar, sheet bar, distant bar, continental shelf.According to microfacies study of nine small sandstone lays C1 C2 C3 C7 C9 D1 D3 D7 D8 and integrated with sedimentary model figure of every sandbody, incised canyon infilling and delta plain distribute in LST in northern part of stuffy area. Main sandstone body is controlled by braided fluvial subfacies, delta plain subfacies and delta front subfacies. So the main reservoir sandstone is controlled by sequence framework, and the sandbody is distributed in LST and HST widely. Sandsbody doesn't present in TST.According to reservoir physical property and reservoir microcosmic feature and sandstone thickness, the reservoir can be divided into order I II. the sansbody lays belong to order I except lays C3 C7 D8.