鄂尔多斯盆地白豹-华池地区长6油层组物源区分析

物源区分析技术主要包括碎屑成分对比技术、重矿物分析技术、沉积相分析技术、地球化学分析技术、石英阴极发光分析技术等。本课题研究区范围相对较大,受多方向物源供给的影响较大,因此,在确定白豹—华池地区长6油层组沉积时的物源区母岩性质和物源方向时,采用多种分析方法加以综合判别,其中以碎屑物成分和轻、重矿物组合比对及石英阴极发光分析技术为主要手段,得出研究区存在2个物源方向一是正北和北偏东方向的主物源方向,物源区母岩为位于鄂尔多斯盆地北部阴山古陆中低—中级变质岩与花岗岩组合的古老杂岩体;二是西南方向的次要物源方向,物源区母岩为位于鄂尔多斯盆地西南部崆峒山的下古生界地层。

Provenance analysis of Chang 6 oil-bearing formation of Baibao-Huachi region in Ordos Basin

Provenance analysis mainly includes comparison of debris compositions, heavy mineral assemblages, sedimentary facies, geochemical analysis, cathodoluminescence image of quartz and so on. The research area is relatively large and it is influenced by multiple sediment supplies, so multiple analysis methods are adopted to define the characteristics of source rocks and source direction of Chang 6 oil-bearing formation in Baibao-Huachi region. Furthermore mainly by contrast analysis between debris compositions and light/heavy mineral assemblage and quartz cathodoluminescence analysis, two material source directions existing in the research area are proved. The main material source direction is located in the north and northeast of the research area, and the source rocks are ancient hybridization rocks of granite and low-middle/middle rank metamorphic rocks that come from ancient land of Yin Mountain in north Ordos Basin; the secondary material source direction is in the southwest, and the source rock is located in Lower Palaeozoic strata which come from Kongtong Mountain in southwest of Ordos Basin.