鄂尔多斯盆地华庆地区长6期物源分析

Provenance Analysis of Chang 6 Period in Huaqing Area of Ordos Basin

物源分析是开展沉积相研究的基础,物源区母岩性质和物源方向分析是极其重要的基础地质研究内容。根据鄂尔多斯盆地华庆地区约220口井砂岩中的轻、重矿物及粒度资料,结合研究区沉积相分析、陆源碎屑成分和重矿物成分对比,以及平面上粒度粗细变化和沉积相展布规律等诸多因素综合分析,认为华庆地区长6期物源供给主要来自正北和北偏东2个方向,以正北方向为主要物源方向。主物源区母岩性质仍然以变质岩为主,母岩岩石类型应由低、中级变质岩及花岗岩组成。

Provenance analysis is the foundation of sedimentary facies research.Analysis of source rock nature and provenance direction of source area is an extremely important foundation of geological research.According to the light mineral、heavy minerals and grain size data of sandstone of 220 wells in Huaqing Area of Ordos Basin,in combination with sedimentary facies analysis of the study area,terrigenous clastic component and heavy mineral composition comparisons,as well as comprehensive analysis of many factors such as the particle size changes in the plane and distribution law of sedimentary facies,it concludes that provenance supply of Chang 6 period in Huaqing Area is mainly from the north and north-east directions,and the north direction is the main.The source rock nature of the main provenance area is still mainly metamorphic rock,and the source rock consists of low-mid level metamorphic rocks and granite.