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《Acta Sedimentologica Sinica》 2006-06
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Sedimentary Evolution and Microfacies Architecture of the Jurassic Sangonghe Formation in Mobei Arch, Junggar Basin

LI Shuang-wen 1,2 LIU Luo-fu 1,2 ZHANG You-ping 3 YAO Wei-jiang 3 JIN Jun3 ZHAO Jian-zhang 4 SUN Dong 5 (1.Key Laboratory For Hydrocarbon Accumulation Mechanism in China University of Petroleum, Ministry of Education, Beijing 102249; 2. Basin and Reservoir Research Center, China University of Petroleum, Beijing 102249; 3. Scientific Research Institute of Petroleum Exploration and Development of Xinjiang Oilfield Company, CNPC, Karamay, Xinjiang 834000; 4. BGP Geophysical Institute, CNPC, Zhuozhou 072751; 5. Northwest Branch, RIPED, PetroChina, Lanzhou 730020)  
Based on the high-resolution stratigraphic principles, the Jurassic Sangonghe Formation is divided into 10 short-term base-level cycles and 2 middle-term base-level cycles. The analysis of sedimentary evolution was carried out based on the short-term base-level cycles. In the period of Sangonghe Formation sedimentation, the 3 kinds of sedimentary conditions (braded-river delta front, meandering-river delta front and shore shallow lacustrine) occurred alternately. In the different sub-periods, there are different microfacies. The microfacies of braded-river delta front mainly include braded sub-water channels and interchannels, debouch bars and mat-shape sands scarcely occur. Meandering-river delta front mainly consists of sub-water meandering branch channels, interchannels, debouch bars, far bars and mat-shape sands; While shore shallow lacustrine consists of mudflats and bank bars. The study result shows in braided-river delta front sub-water channels that superimpose and distribute widely in succession, are favorable reservoirs for structural oil pools and exist in change place of middle base-level from descending to ascending. In center of middle base-level ascending and descending, sub-water channels and debouch bars that distribute isolatedly, are the main microfacies in meandering-river delta fronts. They are advantageous reservoirs for lithologic oil pools.
【Fund】: 中国石油股份公司重大科技攻关项目(编号:20040201)资助.
【CateGory Index】: P512.2
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