鄂尔多斯盆地姬塬-胡尖山地区长6油层组的物源和优质储层分布

SOURCE ANALYSIS AND FAVORABLE RESERVOIR DISTRIBUTION OF CHANG 6 FORMATION IN JIYUAN-HUJIANSHAN AREA

依据砂岩组分特征、石英阴极发光、重矿物组合、砂体展布方向和岩相古地理格局等对鄂尔多斯盆地姬塬-胡尖山地区长6油组的物源进行了分析,认为变质岩及酸性岩浆岩为该油组的主要母岩类型,东北、西北为两大主要物源方向并呈此消彼长的翘翘板式变化规律;在此基础上,对不同物源控制区的储层物性进行了详细分析,证明物源的分布范围、组合特征是影响该区储层发育的重要因素,而优质储层主要分布在马家山-姬塬、安边-杨井、新安边-铁边城等3个不规则的区域内。

Based on analysis of characteristic of sandstone, cathodeluminescence feature of quartz, the heavy minerals combination, sandstone body distribution and lithfacies palaeogeographic pattern, the mother rock style of this area is metamorphic rocks. The change rule of northeast and northwest source was seesaw type. On this basis, the feature of reservoir which were controlled by different sources are compared, and it prove that the distribution and assembled feature of sources are important factors in the developing of reservoir. The most favorable reservoir were distributing in Majiashan-Jiyuan, AnbianYangjing and Xinanbian-Tiebiancheng area.