The reservoir rocks of deep-water turbidite fans in the eastern segment of the steep slope zone of northern Dongying Sag

Aim To analyze the characteristics of clastic reservoirs and their controlling factors of the deep-water turbidite fan in the eastern segment of the steep slope zone of northern Dongying sag.Methods Using sedimentology and reservoir geology theories and analyzing technique.Results The 4th member of Shahejie formation in the east of northern steep slope of Dongying sag is a deep-water turbidite fan reservoir,whose lithology is mainly sandstone and conglomerate.The reservoir is of the lithological characteristics of low composition maturity and low structure maturity.The reservoir pore space mainly consists of intergraular pore,solution pore and fracture,dominated by residual intergranular pores and solution pores.Poor throat connectivity and serious heterogeneity make it become a typical reservoir with low porosity,low permeability to extra low permeability.The variation of reservoir petrophysical property is primarily controlled by sedimentary facies,diagenesis and structure in it.Conclusion The braided strean and main channel microfacies are the favorable reservoir,and the microfacies of middle channel are the fair reservoir.