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为查明鄂尔多斯盆地西南部宁县—庆阳地区长6期物源状况,揭示该地区沉积体系展布格局,在大量分析化验基础上,利用Dickinson三角投点图判别了物源区的构造背景,通过碎屑组分分布、重矿物组合分区、岩屑分布及地震剖面等多种角度对庆阳地区延长组长6油层组沉积时期的物源及源区母岩性质等进行了系统分析。结果表明,长6期物源区构造背景为构造较复杂的造山带,在宁县—庆阳地区存在了西部、西南和南部3个不同物源方向,东北部为混源区。古物源与沉积砂体展布空间配置关系良好,并决定了该地区长6时期的沉积体系分布格局。对该地区古物源进行分析将有助于下一步油气勘探的部署。
In order to find out the provenance of the Chang 6 area in Ningxian-Qingyang area in the southwestern Ordos Basin and reveal the distribution pattern of the sedimentary system in this area, based on a large number of analytical tests, the Dickinson triangle map is used to identify the tectonic setting of the provenance area, Based on the distribution of detrital components, the combination of heavy minerals, lithic debris distribution and seismic profiles, the authors systematically analyzed the source rocks and source rocks in the Chang 6 oil layer of Qingyang Formation. The results show that the tectonic setting of the source area of the Chang 6 Member is a relatively complicated orogenic belt. There are three different provenance sources in the west, southwest and south of Ningxian - Qingyang area, and the northeast as a mixed source area. The relationship between the ancient provenance and the distribution of sedimentary sand bodies is good, and determines the distribution pattern of the sedimentary system in the 6th period of the area. Analysis of the ancient provenance in the area will help the next step in the deployment of oil and gas exploration.