鄂尔多斯盆地南缘延长组长7油页岩地球化学特征及其地质意义

发布时间：2018-03-25 17:29

  本文选题：鄂尔多斯盆地南缘　切入点：延长组　出处：《地质通报》2016年09期

【摘要】：微量、稀土元素和有机地球化学参数对于揭示油页岩沉积环境、古气候等沉积成矿作用、预测油气、油页岩资源潜力具有重要意义。对鄂尔多斯盆地南部延长组长7油页岩获得的地球化学参数进行研究,油页岩微量元素与地壳平均值及其他地区油页岩相比,W、Mo、As、Sb、U等元素明显富集,Sc、Cr、Ni、Cl等元素明显亏损。油页岩稀土元素总量较低,轻稀土元素富集,重稀土元素亏损,稀土元素较球粒陨石发生了明显分异,较北美页岩分异不明显。油页岩有机质类型为Ⅰ型和Ⅱ_1型,以Ⅱ_1型为主,有机质丰度达到最好级,成熟度为低成熟-成熟。通过对这些地球化学参数及特征的进一步分析,获得以下认识:1长7油页岩是在温暖潮湿的气候条件下,形成于陆相淡水深湖-半深湖还原环境中,这种沉积环境有利于油页岩有机质的富集和保存;2本区不具备形成油气田的潜力,具备形成中-高品级的特大型油页岩矿床的潜力。
[Abstract]:Trace, rare earth elements and organic geochemical parameters are useful to reveal sedimentary mineralization in oil shale and paleoclimate, and to predict oil and gas, The potential of oil shale resources is of great significance. The geochemical parameters obtained from Yanchang No. 7 oil shale in southern Ordos Basin are studied. Compared with the average value of crust and other oil shale, the trace elements of oil shale are obviously enriched in the elements such as SCC, Cr, NiCl and so on. The total amount of rare earth elements in oil shale is lower, light rare earth element is enriched, and heavy rare earth element is depleted. Compared with chondrites, rare earth elements show obvious differentiation, but are less distinct than that of North American shale. The types of organic matter in oil shale are type 鈪，

本文编号：1664146