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《Oil & Gas Geology》 1993-03
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NAPPE STRUCTURES IN SOUTH MARGIN OF JIUXI BASIN AND ITS OIL-BEARING AREAS

Huang Huafang Zheng Guodong Fang Guoqing Xia Yanqing (Lanzhou Institute of Geology,Chinese Academy of Science)  
The typical thrust-fold nappe structural belt occurred in the south margin of JiuxiBasin is broad in scale,very complicated in structure and the evolution process is tortu-ous.The structures include thrust nappe which is mainly composed of Paleozoic Erathemand the fold nappe that is mainly made up of Meso-Cenozoic.The rule of its tectonictransports and emplacements is frontal imbrication. Based on the paleomagnetic and geological structure data of the structural belt,thebelt has become a part of North China Plate since the beginning of Devonian,and it con-nected with Tarim Plate along Altun Fracture after Permian.The napping distance of thenappe structural belt has reached more than 200 km since Permian,of which about 100 kmwas done after Jurassic.In the course of its formation and development,the belt underwent NE-SW direc-tional tension from Z to O_2,NE-SW directional compression from O_3 to P,counterclock-wise rotation from T to J,and near SN directional compression after J.The nappe belt has controlled the range,basement shape,type of deposits and condi-tions for organic matter evolution and hydrocarbon preservation of the basin.Hydrocar-bon exploration areas thus can not be restricted in the front part of the nappe belt,butshould also further extend into its inner part so as to discover oil pools in the nappe andthe overriding belt;hydrocarbon resources could not noly be found in Jurassic-CretaceousSystems,but also in Permo-Carboniferous sediments.
【Fund】: 甘肃省中青年自然科学基金
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