大陆性盐湖盆地混合沉积地层富有机质源岩的地球化学特征及形成机制:中国西北准噶尔盆地石水沟下陷二叠系平地泉地层案例研究

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS
Wenren Zeng , Boran Wang , Xuan Chen , Guobin Fu , Zhihuan Zhang , Zhilong Huang
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引用次数: 0

摘要

中国西北准噶尔盆地石水沟下陷二叠系平地泉地层(P2p)是在盐湖湖相环境中形成的混合沉积地层的典型代表,具有岩性组合复杂、富有机质源岩分布广泛的特点。为进一步研究不同岩性源岩的油源贡献和生烃特征差异,研究其地球化学特征差异和富有机质源岩的形成机理是当务之急。本文在利用有机岩石学、分子地球化学和元素地球化学对源岩的岩性类型、地球化学特征和生烃潜力进行综合分析的基础上,揭示了 P2p 富有机质源岩的形成背景和有机质富集机理。结果表明,P2p 的混合沉积岩是在相对干旱和盐碱的湖相条件下沉积的。在从泥岩、白云质泥岩到芒硝白云岩的沉积过程中,古气候条件趋于干旱,热液活动更加频繁。因此,水柱盐度升高,导致耐盐绿藻和轻微耐盐蓝藻的比例高于不耐盐藻类。古气候和热液活动的频繁变化控制着泥岩、白云质泥岩和霰质白云岩的层间沉积,由此产生的盐度波动导致了不同岩性源岩中耐盐藻和不耐盐藻比例的变化。此外,混合沉积地层(泥岩、白云质泥岩和砾质白云岩)中的源岩都具有很大的碳氢化合物生成潜力,而且同一岩性的源岩之间也存在异质性。影响这些富含有机质的源岩发展的关键因素是火山活动导致的古生产率的提高。此外,盐水造成的水层分化促进了缺氧水柱的形成,也是造成源岩有机质富集的原因之一。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Geochemical characteristics and formation mechanism of organic-rich source rocks of mixed sedimentary strata in continental saline lacustrine basin: A case study of Permian Pingdiquan formation in the Shishugou Sag, Junggar Basin, Northwest China

The Permian Pingdiquan Formation (P2p) in Shishugou Sag, Junggar Basin, Northwest China, is a typical example of mixed sedimentary strata formed in a saline lacustrine environment, characterized by complex lithological assemblages and extensive distribution of organic-rich source rocks. To further investigate the differences in oil-source contribution and hydrocarbon generation characteristics of source rocks with different lithologies, studying the difference of their geochemical characteristics and the formation mechanism of organic-rich source rocks is the top priority. Based on a comprehensive analysis of lithologic types, geochemical characteristics, and hydrocarbon generation potential of source rocks using organic petrology, molecular geochemistry and element geochemistry, this paper reveals the formation background and organic matter enrichment mechanism of the P2p organic-rich source rocks. The results show that the mixed sedimentary rocks of the P2p were deposited under relatively arid and saline lacustrine conditions. Paleoclimatic conditions tended to be more arid and hydrothermal activity became more frequent during the sedimentation process from mudstone, dolomitic mudstone to argillaceous dolomite. Consequently, the water column salinity elevated, leading to an increased proportion of salt-tolerant green algae and slight salt-tolerant cyanobacteria compared to salt-intolerant algae. Frequent changes in paleoclimate and hydrothermal activity control the interbedding deposition of mudstone, dolomitic mudstone and argillaceous dolomite, and the resulting salinity fluctuations contribute to variations in the proportion of salt-tolerant and intolerant algae in source rocks with different lithologies. Furthermore, the source rocks within the mixed sedimentary strata (mudstone, dolomitic mudstone and argillaceous dolomite) all exhibit substantial hydrocarbon generation potential, and there exists heterogeneity among source rocks of the same lithology. The key factor influencing the development of these organic-rich source rocks is the enhancement of palaeoproductivity driven by volcanic activity. Additionally, the water stratification caused by saline water promotes anoxic water columns, also contributing to organic matter enrichment in the source rocks.

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来源期刊
International Journal of Coal Geology
International Journal of Coal Geology 工程技术-地球科学综合
CiteScore
11.00
自引率
14.30%
发文量
145
审稿时长
38 days
期刊介绍: The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.
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