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世界地质 2021, 40(2) 330-342 DOI: ISSN: 1004-5589 CN: 22-1111/P

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	银额盆地
	巴音戈壁组
	油页岩
	有机地球化学
	成矿条件
	本文作者相关文章
	于佳琦
	柳蓉
	张坤
	闫旭
	PubMed
	Article by Yu J
	Article by Liu Ｒ
	Article by Zhang K
	Article by Yan X

银额盆地下白垩统巴音戈壁组油页岩有机地球化学特征及成矿条件

于佳琦，柳蓉，张坤，闫旭

1. 吉林大学地球科学学院，长春130061; 2. 吉林省油页岩及共生能源矿产重点实验室，长春130061

摘要：通过对银额盆地下白垩统巴音戈壁组油页岩总有机碳、全硫、岩石热解和生物标志化合物等分析，讨论了巴音戈壁组油页岩有机地球化学特征及成矿条件。研究表明: 巴音戈壁组油页岩的有机质丰度较高，干酪根类型为Ⅰ型和Ⅱ1 型。正构烷烃呈单峰分布，主碳峰数为nC27或nC31。甾类化合物中重排甾烷含量较低，以规则甾烷为主，C27 － C28 － C29规则甾烷呈反L 型分布。萜类化合物中以C30 藿烷占优势的五环三萜类化合物含量最高，其次为三环萜烷，还检测到少量的伽马蜡烷和奥利烷。研究区样品的Tmax为432℃ ～ 439℃，CPI 和OEP 呈高值，甾烷C29ααα20S / ( 20S + 20Ｒ) 、藿烷Ts / ( Ts + Tm) 和C3122S / ( 22S + 22Ｒ) 均呈低值，反映了巴音戈壁组油页岩有机质处于未成熟--低成熟阶段。正构烷烃ΣC21 － /ΣC22 + ( 0. 20 ～ 0. 29) 呈低值，规则甾烷Σ ( C27 + C28 ) /ΣC29 ( 0. 83 ～ 1. 15) 在1 ±，萜类化合物中高丰度的藿烷系列( C27 － 35 ) 、中等丰度的三环萜烷、低丰度的伽马蜡烷和奥利烷，综合反映了油页岩有机质来源为细菌和藻类等低等水生生物、浮游生物以及陆生植物的混合来源。S / TOC ( 0. 01 ～ 0. 19) 、伽马蜡烷指数( 0. 11 ～ 0. 37) 、Pr /Ph ( 0. 30 ～ 0. 62) 和较低的重排甾烷丰度等指示巴音戈壁组油页岩形成于淡水--半咸水、还原环境。淡水--半咸水条件下，盐度分层引起的底层水还原环境是银额盆地巴音戈壁组二段油页岩成矿的有利条件。

关键词：银额盆地巴音戈壁组油页岩有机地球化学成矿条件

Organic geochemical characteristics and metallogenic conditions of oil shale of Lower Cretaceous Bayingebi Formation in Yin'e Basin

YU Jia-qi，LIU Ｒong，ZHANG Kun，YAN Xu

1. College of Earth Sciences，Jilin University，Changchun 130061，China; 2. Key Laboratory for Oil Shale and Coexistent Energy Minerals of Jilin Province，Changchun 130061，China

Abstract: The authors discussed the organic geochemical characteristics and metallogenic conditions of oil shale of Lower Cretaceous Bayingebi Formation in Yin'e Basin based on TOC，S，rock pyrolysis and biomarkers analysis． The results show that the abundance of organic matter is high，the kerogen contains type Ⅰ and type Ⅱ1 ．N-alkanes show unimodal distributions with nC27 or nC31 as main peaks． Steroids mainly consist of regular steranes with C27 － C28 － C29 distributed in inverse“L”shape，while the abundance of rearranged steranes is relatively low．In terpenoids，pentacyclic triterpanes，predominantly C30 hopane are the most abundant，followed by tricyclic terpane，and minor gammacerane and oleanane． The Tmax of samples in the study area is 432℃ ～ 439℃，CPI and OEP are high，while steranes C29ααα20S / ( 20S + 20Ｒ) ，hopanes Ts / ( Ts + Tm) and C3122S / ( 22S + 22Ｒ) are low，indicating that the organic matter of oil shale of Bayingebi Formation is in the immature or low mature stage． N-alkanes ΣC21 － /ΣC22 + ( 0. 20 ～ 0. 29) are low，regular steranes Σ ( C27 + C28 ) /ΣC29 ( 0. 83 ～1. 15) are around 1，together with highly abundant hopanes ( C27 － 35 ) in terpenoids，medium abundant tricyclic terpane and low abundant gammacerane and oleanane，it is suggested that the organic matter in oil shale was from a mixed source of lower aquatic organisms such as bacteria and algae，plankton and terrestrial plants． S /TOC ( 0. 01 ～0. 19) ，gammacerane index ( 0. 11 ～ 0. 37) ，Pr /Ph ( 0. 30 ～ 0. 62) ，low abundant rearranged steranes indicate that the oil shale of Bayingebi Formation formed in fresh-brackish water and reductive environment． Under the condition of fresh-brackish water，the bottom water reduction environment caused by salinity stratification is favorable for the mineralization of oil shale of the second Member of Bayingebi Formation in Yin'e Basin．

Keywords: Yin'e Basin Bayingebi Formation oil shale organic geochemistry metallogenic conditions

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