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Reservoir quality differences of submarine fans in deep-water oilfield A in Niger Delta Basin,West Africa
Pages: 494-502
Year: Issue:  4
Journal: Oil & Gas Geology

Keyword:  submarine fansequencereservoir qualityNiger Delta BasinWest Africa;
Abstract: Deep-water submarine fans are characterized by large dimensions ,special deposition positions and complex for-mation processes .Compared with terrestrial and shallow water deposits ,reservoir quality of deep-water submarine fans are poorly studied ,influencing the effective development of this kind of reservoirs .In this paper ,taking deep-water oilfield A in the Niger Delta Basin in West Africa as an example ,reservoir quality differences and controlling factors of submarine fans are researched based on core observations and descriptions ,logging cross plot analyses and seismic attribute slicing . The results show that reservoir spaces of submarine fans are dominated by primary pores and the diagenesis is weak . Therefore,the reservoir quality is mainly controlled by sedimentary factors .According to lithology and sedimentary struc-tures,these reservoirs could be divided into six types of rock facies ,such as cross-laminated fine sandstones ,parallel-la-minated medium to fine sandstones ,massive medium to fine sandstones and so on .Microscopically ,porosity and permea-bility of submarine fan reservoirs are controlled by sorting and matrix content respectively ,but insignificantly influenced by median grain size,resulting in unique variation patterns of reservoir quality of different rock facies or sedimentary facies.Microscopically,spatial quality differences of submarine fan reservoirs are influenced by sequence,which con-trols spatial-temporal distributions of various sedimentary facies and rock facies combinations of the same type of sedi-mentary facies.
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