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Reservoir features and controlling factors of J_1-J_2~2 Members of Fuxingchang in East Sichuan

KANG Bao-ping1,ZHANG Fan1,WANG Xing-zhi1,WANG Yong-li2,JI Xiu-zhen3 (1.Postgraduate School of Southwest Petroleum University,Chengdu 610500,China;2.Tianjin Branch Company of CNOOC,Tianjin 300452,China;3.Geologic Logging Company of Shengli Oilfield,Dongying 257064,China)  
Based on the flake observation and physical properties data of reservoir in Jialingjiang Formation in Fuxingchang region of East Sichuan,detailed study on the reservoir properties and controlling factors of J1J22 Members is carried out.Result indicates that the best reservoir rock is dolomite category and the second best is fine limestone in J1-J22 Members.Intergranular and intragranular dissolved pores,intercrystalline and intracrystalline pores and fractures are developed in dolomite category reservoir,mainly in J22 Member,forming pore-fracture type of reservoir.Only pored dissolved holes and fractures are developed in calcareous rock reservoir,mainly in J1 Member,forming pore-fracture type of reservoir.Comparison of porosity,permeability and thickness shows that reservoir property of J22 Member is better than J1 Member,as the best position of reservoir development and hydrocarbon aggregation in Jialingjiang Formation.The reason is that Jialingjiang Formation reservoir is under the control and influence of deposition,diagenesis and tectonism.Deposition as basic factor caused early reservoir differentiation-mainly calcareous rock in J1 Member and dolomite in J22 Member.Dolomite lithofaction reconstructed dolomite rocks,playing a key role in improving reservoir property in J22 Member.Tectonism provides conditions for the above activities.
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