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Characteristics and genetic analysis of grain shoal reservoirs in Lei 3 member of Middle Triassic Leikoupo formation, Sichuan Basin
DING Xiong1,2,3, TAN Xiu-cheng1,3, LI Ling1, LUO Bing4, TANG Qing-song5, MA Hua-ling6
(1.College of Resource and Environment, Southwest Petroleum University, Chengdu 610500,China;2.Post-Doctor Station, Chengdu University of Technology, Chengdu 610059,China;3.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610501,China;4.Post-Doctor Station, Southwest Oil & Gas Field Company, CNPC,Chengdu 610051,China;5.Chuanzhong Oil & Gas Field of Southwest Oil & Gas Field Company, CNPC,Suining 629001,China;6.Chuanxibei Gas Field of Southwest Oil & Gas Field Company,CNPC, Jiangyou 621700,China)
Abstract:
The characteristics and genesis of grain shoal carbonate reservoirs were studied by using the data of drilling, logging and core in Lei 3member of Middle Triassic Leikoupo formation in Sichuan Basin. The results show that the residual intergranular preservation reservoirs and syngenetic karst reservoirs are the main genetic types of grain shoal carbonate reservoirs. Residual intergranular pores and intergranular dissolved pores are main reservoir space of residual intergranular preservation reservoirs, and tubular throats and neck throats are developed. Relatively good configuration of the pore throat leads to the characteristics of medium porosity and medium permeability and good capacity. The isolate intragranular corroded pores and mould pores are main reservoir space of syngenetic karst reservoirs, and throat is less developed. Configuration of medium pore and micro-throat leads to the characteristics of medium pore and low permeability. The grain carbonate developed in the marginal platform and interior platform provides the early material basis for the two types of grain shoal reservoirs. The thickness of a single shoal body directly controls the reservoir and permeation form of the two types of grain shoal reservoirs. Diagenetic evolution plays a key role in finalizing the shape of the two types of grain shoal reservoirs.
Key words:  residual intergranular pore  syngenetic karstification  reservoir  Lei 3member of Leikoupo formation  Sichuan Basin