立足于前人研究成果，利用测井、钻井、地震等基础资料，系统分析鄂尔多斯盆地姬塬西北部地区长8油层组的断层成因机制和发育特征，探讨油藏类型和断层对成藏的控制作用。研究表明，姬塬西北部地区断层发育主要受到燕山、喜马拉雅两期构造运动的影响，形成了东部马家滩-古峰庄隆起带北西-南东向的逆断层发育区、中部红井子拗陷带北北西-南南东向的逆断层及直立断层发育区和西侧的红柳沟斜坡带近南北向的地堑式组合正断层发育区；按成因机制及发育特征将断层划分为直立断层、前期逆断层、后期正断层和横断层4种基本类型；将区内油藏划分出断层-小背斜型油藏、断背斜型油藏以及岩性油气藏3种类型。断层对油藏的控制作用主要体现在横向与垂向上控制原油运移、侧向的封闭性及后期的调整性，并提出低压吸拉和毛细管力导入两种成藏模式。%Based on the preceding research results,the authors make a systematic analysis of Chang-8 oil formation's fault characteristics,formation mechanism and their control on the reservoir in the northwest of the Jiyuan district,Ordos Basin,and discuss how the faults influence on the reservoir. The result shows that the formation of the faults are affected by Yanshan and Himalayan tectonic movements.The SE-NW thrust faults have developed in the Majiatan-Gufengzhuang uplift belt on the east,and in middle part,the Hongjingzi depression belt,the NW-SE and NNW-SEE thrust faults and vertical faults have well developed,but on the west side,the Hongliugou clinoform zone is distributed by the S-N normal faults which are featured by Graben combination.According to the formation mechanism and development characteristics,the faults can be classified as the vertical fault,the former thrust fault,the later normal fault and the transverse fault.Combined with the characteristics of the three reservoir types (the fault-small anticline type reservoir,the fault anticline type reservoir and the lithologic reservoir)in the survey region,the authors think that the control of the faults on the oil and gas reservoir is mainly to control the migration of the reservoir from lateral and vertical directions,to seal the lateral direction and adjust the later state.Finally,this paper presents two kinds of accumulation model pulled by low pressure and channeled through capillary.
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