Characteristics and distribution of inside volcanic reservoirs of the Carboniferous in upper-plate of Ke-Bai fault zone in Junggar Basin
Li Chen1,2, Ji Hancheng1,2, Jin Jun3, Wang Jian3, Fang Chao1,2, Jia Haibo1,2, Li Xue1,2, Xiang Pengfei1,2, Li Zongyue1,2, Xing Xiaofan1,2
1 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249; 2 College of Geoscience,China University of Petroleum(Beijing),Beijing 102249; 3 Lab and Experimental Test Research Institute,Xinjiang Oilfield Branch Company,PetroChina,Karamay 834000,Xinjiang;
Abstract：From the latest drilling results of Ke-Bai fault zone in Jungger Basin,commercial oil are found in inside volcanic rocks of the Caboniferous which is far away beneath the Carboniferous unconformity. Based on the date of core,thin section,scanning electron microscopy,main elements and the physical properties,the characteristics and distribution of the inside volcanic reservoirs of the Caboniferous are definited. The study suggests the inside volcanic reservoirs are 800 m below the Caboniferous unconformity. The main types of lithofacies(lithology) are air fall subfacies of explosion facies(tuff)and lower subfacies of effusive facies(andesite). The main types of reservoir space are dissolved pore and tectonic fracture. Different kinds of lithofacies have different types of diagenesis and degrees of porosity evolution process. Upper effusive subfacies and lower effusive subfacies have the highest degree of pore evolution. Original interstice are controlled by the condensation. Tectonic broken and dissolution is essential to the reservoirs. Level-Ⅰ and level-Ⅱ reservoirs controlled by tectonic broken and dissolution are the effective reservoirs,which are distributed by the Ke-Bai Fault.
Li Chen,Ji Hancheng,Jin Jun et al. Characteristics and distribution of inside volcanic reservoirs of the Carboniferous in upper-plate of Ke-Bai fault zone in Junggar Basin[J]. JOPC, 2017, 19(4): 677-691.
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