鄂尔多斯盆地东南部延长组长7油页岩控矿因素分析

Analysis on ore-controlling factors of oil shale of Chang 7 of Yanchang formation Southeastern Ordos Basin

鄂尔多斯盆地延长组长7油页岩资源丰富,为了分析其主要控制因素,利用研究区石油及油页岩钻探成果,结合油页岩成矿理论,总结了延长组油页岩形成的四大主控因素和坳陷湖盆浅湖油页岩成矿模式,修正了前人关于油页岩有利沉积相带的认识,提出油页岩形成的最有利相带为浅湖-半深湖相湖湾环境,对该区油页岩资源评价具有指导意义。

Ordos Basin is abundant in oil shale resources,especially for oil shale of Chang 7of Yanchang formation.In order to study the main controlling factors,combined with the previous achievements on drilling data and classic oil shale metallogenic theory in research area,the four main controlling factors,metallogenic model of oil shale in a depression basin have been greatly summarized.Meanwhile,the previous understanding of favorable sedimentary facies of oil shale has been better developed.It is concluded that the most favorable sedimentary facies is semi-deep,deep lake,which is significantly important for oil shale resources in this area.