Characteristics and genesis of lacustrine laminar coal and oil shale: A case study in the Dachanggou Basin, Xinjiang, Northwest China
Characteristics and genesis of lacustrine laminar coal and oil shale: A case study in the Dachanggou Basin, Xinjiang, Northwest China
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湖相层状煤、油页岩特征及成因——以新疆大厂沟盆地为例
DOI：
10.1016/j.marpetgeo.2021.104924
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发表时间：
2021-04
影响因子：
4.2
通讯作者：
李元吉
中科院分区：
文献类型：
--
作者：
王君贤;孙平昌;刘招君;李元吉
湖相层流煤是一种不寻常且罕见的沉积矿床，特别是当它与油页岩共存时；这种组合对于指示古环境的演化具有特殊意义。新疆维吾尔自治区大厂沟盆地早侏罗世八道湾组含煤及油页岩地层为揭示早侏罗世高频环境变化演化提供了理想的范例。基于大量地球化学数据，研究了湖相层流煤与油页岩的古环境、古气候和成因差异。八道湾组油页岩有机质丰度和生烃潜力较高，含有I型和II1型有机质。但与油页岩相比，夹层层状煤具有更高的有机质丰度和生烃潜力，有机质类型为II1。各种环境地球化学指标表明，油页岩形成于温暖湿润的气候条件下，在含氧-缺氧条件下沉积于淡水中，藻类是有机质的主要来源，其次是陆源有机质。层流煤形成于相对高温时期，并堆积在低氧-低氧盐湖中。有机质来源主要是流域周围的高等植物或亲水植物，其次是藻类。短期热事件淹没了湖缘，增加了陆源有机质的输入，促进了薄层状煤与油页岩互层的形成。
Lacustrine laminar coal is an unusual and rare sedimentary deposit, especially when it coexists with oil shale; this combination has special significance for indicating the evolution of the paleoenvironment. The coal-bearing and oil shale strata of the Early Jurassic Badaowan Formation in the Dachanggou Basin, Xinjiang Uygur Autonomous Region, present an ideal example to reveal the evolution of high-frequency environmental changes in the Early Jurassic. Based on bulk geochemical data, the paleoenvironmental, paleoclimatic and genetic differences between lacustrine laminar coal and oil shale were studied. The Badaowan Formation oil shale has high organic matter abundance and hydrocarbon-generating potential and contains type I and type II1organic matter. However, compared with oil shale, interlayered laminar coal has higher organic matter abundance and hydrocarbon-generating potential, and the type of organic matter is II1. Various environmental geochemical indicators suggest that oil shale formed in a warm and humid climate and was deposited in fresh water under oxic-suboxic conditions and that algae were the main source of organic matter, followed by terrigenous organic matter. Laminar coal formed in relatively high-temperature periods and accumulated in suboxic-euxinic saline lakes. The source of organic matter was mainly higher plants or hydrophilic plants around the basin, followed by algae. Short-term thermal events swamped the lake margins and increased the input of terrigenous organic matter, which promoted the formation of thin laminar coal interbedded with oil shale.
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