Deep-water submarine fans are characterized by large dimensions

special deposition positions and complex formation 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 structures

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 permeability 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 controls spatial-temporal distributions of various sedimentary facies and rock facies combinations of the same type of sedimentary facies.