东营凹陷北部陡坡带东段深水浊积扇储集特征

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

目的分析东营凹陷北部陡坡带东段深水浊积扇体储层特征及其控制因素。方法利用沉积学、储层地质学理论及分析技术。结果东营凹陷北部陡坡带东段沙4段储层是砂、砾岩为主的深水浊积扇沉积体,其储层岩石结构成熟度和成分成熟度均较低,储集空间以残余粒间孔和溶蚀孔为主。喉道连通差,非均质性强,为典型的低孔、低渗—特低渗储集层。储层物性的变化主要受控于沉积微相、成岩作用及构造等因素。结论辫状水道及主沟道微相是最有利的储集相带,道间微相为较有利的储集相带。

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 4^th 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.