鄂尔多斯盆地华庆地区长6期物源分析

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。本文根据鄂尔多斯盆地华庆地区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两个方向,以正北方向为主要物源方向。主物源区母岩性质以变质岩为主,母岩岩石类型为由低-中级变质岩和花岗岩。

Provenances of the Chang-6 oil measures in the Huaqing region,Ordos Basin

In the light of the light and heavy mineral assemblages and grain size data of the sandstones from about 220 wells in the Huaqing region,Ordos Basin,in combination with sedimentary facies analysis and comparison of terrigenous clastic and heavy mineral compositions,the principal sources of detritus in the Chang-6 oil measures lay to the north and northeast of the Basin.The parent rocks in the source areas are mainly composed of low-to medium-grade metamorphic rocks and granites.