Geological anomaly theory,multiple technical approaches of factor analysis,trace elements analysis,trend surface analysis and data normalization treatment are used to discuss the controlling factors and distributive characteristics of the effective source rock of Chang-7 Member of Triassic Yanchang Formation in Ordos Basin.A method of geological data collection and information integration on the source rock of Chang-7 Member is proposed.It is indicated that the biological burst of the lower aquatic paleo-organisms (type index of organic matter) and degree of thermal evolution of organic matter are the main controlling factors to the development of effective source rock under the background of a generally high content of total organic carbon.The relatively concentrated distribution of effective rock is generally located in the south Jiyuan,west Dingbian,east Youfangzhuang,Huachi area and the northeast Heshui,which indicates a certain degree of relating and controlling effect on the zones of tight oil high production.The study reveals that the favorable direction for future exploration and exploitation of tight oil in Chang-7 Member includes the area from Gengwan to Huanxian,the north Huachi,Youfangzhuang to Wucangpu area and the Dingbian area.%探讨鄂尔多斯盆地上三叠统长7段致密油有效烃源岩的主控地质因素及分布特征.结合地质异常理论,采用因子分析、痕量元素分析、趋势面分析及标准化处理等技术手段,提出一种对研究区长7段烃源岩进行地质数据挖掘与信患整合的评价方法,建立表征烃源岩品质的综合性无因次线性组合,揭示出在有机碳丰度普遍较高的背景下,有效烃源岩的发育主要受控于低等水生生物勃发(有机质类型指数)与有机质热演化程度(镜质体反射率).有效烃源岩集中分布于姬塬南部、定边西部、油房庄东部、华池地区及合水东北部,对致密油高产富集带的分布具有一定的控制作用.有利于进一步提高长7段致密油勘探开发成效的地区主要是耿湾—环县、华池北部、油房庄—吴仓堡及定边.
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