Characteristics and favorable controlling factors of karst reservoirs within the uppermost part of Ordovician in western Shandong-eastern Henan area
Ji Hancheng1, 2, Fang Chao1, 2, Hua Nan1, 2, Xiao Jing1, 2, Li Haiquan1, 2, Li Xue1, 2, Li Chen1, 2, Ma Pengpeng3, Mao Xiang3
1 State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum(Beijing),Beijing 102249; 2 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249; 3 New Energy Researching Institute of Star Petroleum Co.,Ltd.,SINOPEC,Beijing 100083;
Abstract Based on observation of outcrops,cores and thin sections and analysis of logging data,combined with regional geological background,features,evolution,main controlling factors of the reservoir within the Fengfeng Formation and Majiagou Formation,the uppermost part of Ordovician in the western Shandong-eastern Henan(Dongpu) area were studied deeply. Subsequently,the distribution of favorable reservoirs was predicted. The study results revealed that grain limestone,dolomitic limestone,micrite limestone,silty-fine crystalline dolostone,gypsum-bearing dolostone and algae dolostone were the dominant rock types,and the main reservoir spaces were cracks and pores. The average porosity of dolomite reservoirs was 2.5%,and the average permeability was 7.43×10-3μm2. The average porosity of limestone reservoir was 2.2%,and the average permeability was 2.72×10-3μm2. The reservoirs had experienced four evolution stages,which are the period of penecontemporaneous pore formation(Cambrian-Middle Ordovician), weathering leaching period(Late Ordovician-Early Carboniferous), minerals filling period(Late Carboniferous-Late Cretaceous) and the period of pore dissolution reconstruction(Paleogene). Sedimentary facies,diagenesis and tectonic stress play a significant role in controlling the formation of favorable reservoirs. The study indicates that areas superimposed by the grain bank, tidal flat facies zone,fault belt,dolomitization area,penecontemporaneous karstification area,epigenic karstification area and buried karstification area are predicted as the most favorable reservoir zone. Areas superimposed by the grain bank, tidal flat facies zone,dolomitization area,penecontemporaneous karstification area,epigenic karstification area and areas superimposed by the fault belt,epigenic karstification area,buried karstification area are predicted as the secondary favorable reservoir zones. Areas superimposed by the grain bank, tidal flat facies zone,fault belt,dolomitization area,penecontemporaneous karstification area and buried karstification area are predicted as the general reservoir zone.
About author: Ji Hancheng, born in 1966, is a professor and doctoral tutor of China University of Petroleum(Beijing). He is mainly engaged in sedimentary rock, sedimentary facies, digenesis and reservoir evaluation. E-mail: jihancheng@vip.sina.com.
Cite this article:
Ji Hancheng,Fang Chao,Hua Nan et al. Characteristics and favorable controlling factors of karst reservoirs within the uppermost part of Ordovician in western Shandong-eastern Henan area[J]. JOPC, 2016, 18(4): 545-559.
Ji Hancheng,Fang Chao,Hua Nan et al. Characteristics and favorable controlling factors of karst reservoirs within the uppermost part of Ordovician in western Shandong-eastern Henan area[J]. JOPC, 2016, 18(4): 545-559.
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