Major, trace and rare earth element geochemistry of coal and oil shale in the Yuqia area, Middle Jurassic Shimengou Formation, northern Qaidam Basin

IF 1.3 4区工程技术 Q4 ENERGY & FUELS

Oil Shale Pub Date : 2020-01-01 DOI:10.3176/oil.2020.1.01

Yueyue Bai, Qingtian Lv, Zhaojun Liu, P. Sun, Yinbo, Xu, Jingyao, Meng, Qingtao, Wenquan, Xie, Junxian Wang, Kebing Wang

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引用次数: 4

Abstract

Coal and oil shale in the Middle Jurassic Shimengou Formation of the northern Qaidam Basin (China) have been characterized and compared using total organic carbon (TOC) content, oil yield, and proximate as well as major, trace and rare earth element (REE) and X-ray powder diffraction (XRD) analyses. The results show that coal is represented by lignite and bituminous coal and oil shale is of medium quality. In both coal and oil shale, Si, Al, K, Ti and Na originate from a mixed clastic sedimentary component comprised of clay minerals, quartz and feldspars. In coal, rare earth elements (REEs) are related to phosphate minerals, whereas those in oil shale have inorganic affinities and are mainly associated with clay minerals and quartz. REEs in coal and oil shale are of terrigenous origin. Both coal and oil shale in the Yuqia area are possibly the products of source rocks that have experienced moderate chemical weathering during a warm and humid climate, and they have similar source rocks of felsic volcanic and sedimentary rocks.

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柴达木盆地北部中侏罗统石门沟组雨恰地区煤、油页岩主要、微量和稀土元素地球化学特征

采用总有机碳(TOC)含量、含油量、稀土元素(REE)、主量、痕量元素(REE)和x射线粉末衍射(XRD)等分析方法，对柴达木盆地北部中侏罗统石门沟组煤、油页岩进行了表征和比较。结果表明:煤以褐煤和烟煤为代表，油页岩为中等质量。在煤页岩和油页岩中，Si、Al、K、Ti和Na均来源于粘土矿物、石英和长石组成的混合碎屑沉积组分。煤中的稀土元素主要与磷矿物有关，而油页岩中的稀土元素主要与黏土矿物和石英有关，具有无机亲和力。煤和油页岩中的稀土均为陆源稀土。玉峡地区的煤页岩和油页岩都可能是在温暖湿润的气候条件下，烃源岩经历了中度化学风化作用的产物，烃源岩具有相似的长英质火山岩和沉积岩。

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来源期刊

Oil Shale 工程技术-工程：石油

CiteScore

2.90

自引率

15.80%

发文量

审稿时长

4.2 months

期刊介绍： The Oil Shale is a scientific-technical open access journal published by the Estonian Academy Publishers in collaboration with the University of Tartu, Tallinn University of Technology, and the Estonian University of Life Sciences.