摘要:物源分析是盆地分析和古地理分析的基础内容，对构造、沉积等各方面都具有指示意义，进而可以为识别沉积体系和油气储层展布提供帮助。对鄂尔多斯盆地东南部延长组早期地层的砂岩和泥岩样品进行了轻、重矿物分析、阴极发光测试、微量及稀土元素测试等，结果表明：延长组早期，研究区物源供给较稳定，分别来自盆地东北缘阴山古陆和南缘古秦岭，源岩主要是上地壳太古宙以后的长英质岩石地层，兼有少量沉积岩和太古宙古老地层岩石混入，当时研究区内处于弱氧化弱还原—氧化的淡水沉积环境，气候温暖湿润。
关键词: 鄂尔多斯盆地/
延长组/
物源/
沉积环境
Abstract:Provenance analysis is the basic content of basin analysis and paleogeographic analysis, which has indicative significance in structure, sedimentation and other aspects, and can help to identify sedimentary system and distribution of oil and gas reservoirs. Light and heavy mineral analysis, cathodoluminescence test, trace and rare earth element test were carried out on the sandstone and mudstone samples from the early Yanchang Formation in the southeast of Ordos Basin. The results show that in the early period of Yanchang Formation, the provenance supplies of the study area are relatively stable, which come from the Yinshan ancient land in the northeast edge of the basin and the ancient Qinling in the south edge. The source rock is mainly the felsic rock after Archean from the upper crust, with a few sedimentary rocks and Archean rocks mixed in. At that time, the study area was in a fresh water sedimentary environment of weak oxidation and weak reduction-oxidation, with warm and humid climate.
Key words:Ordos Basin/
Yanchang Formation/
Provenance/
Sedimentary environment
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