环县—正宁地区长9油层组沉积物源分析

Sediment Provenance Analysis of Chang 9 Oil-bearing Layer in Huanxian-Zhengning Area

为了厘清鄂尔多斯盆地环县—正宁地区长9油层组物源方向,利用重矿物特征、砂岩碎屑成分特征、石英颗粒阴极发光特征、全岩及黏土矿物组成以及砂岩粒度分析等多种研究方法进行物源分析。研究结果表明:研究区长9油层组沉积期的物源供给主要为西部和西南部两大物源区,西部物源供给路线较近,主要影响环县周边地区,西南物源供给路线较远,影响峡口—长武—宁县—合水地区,华池附近可能受到西部和西南部两支物源的共同影响。

The provenance of Chang 9 oil-bearing layer in Huanxian-Zhengning area of Ordos Basin is analyzed by means of the features of heavy minerals,the characteristics of sandstone clastic composition,the cathode luminescence characteristics of quartz particles,the composition characteristics of whole rock and clay mineral and the analysis result of sandstone particle size.The research results show that in the sedimentary period of Chang 9 oil-bearing layer in the study area,there are two major rock source supply areas,one is in the west and the other is in the southwest.The western source supply area is closer,the migration route mainly affects the surrounding area of Huanxian country.The southwestern source supply area is far away,the migration route mainly affects Xiakou-Changwu-Ningxian-Heshui area.Huachi area may be affected by both the western and the southwestern source supply areas.