Sedimentary characteristics of the Lower Jurassic in Cainan area in Junggar Basin
Shen Nan1,2, Zhu Aiguo3, Gao Xianzhi4
1 Cainan Operation Department，PetroChina Xinjiang Oilfield Company，Fukang 831511，Xinjiang 2 Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029 3 Department of Exploration and Development，Xinjiang Petroleum Institute，rümqi 830000，Xinjiang 4 Faculty of Natural Resources and Information，China University of Petroleum(Beijing)，Beijing 102249
Abstract：Based on the detailed core description，combined with the correlation analyses of a great deal of exploitation wells，we analyzed the microfacies and distribution characteristics of the skeletal sandbodies of the upper part of Jurassic Badaowan Formation and the lower part of overlying Sangonghe Formation in the Cainan area in eastern Junggar Basin. The results indicate that the Member 3 of the Badaowan Formation and the Member 1 of the Sangonghe Formation in Cainan area were dominated by an anastomosed fluvial facies. Three types of sedimentary subfacies(channel，levee and flood plain)and six types of microfacies were identified in this area. The main reservoir sandbodies are channel sandbodies and crevasse splay sandbodies. The channel sandbodies occur as narrow elongated bodies which are connected with each other，with the width of less than 1000m，ranging from 300m to 800 m. The crevasse splay sandbodies are smaller in scale and occur as a lenticular shape in the section.
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