Geochemical constraints on the hydrocarbon generation and expulsion in source rocks with different primary organic matter compositions: A case study on the Lucaogou Formation in the Jimusaer Sag, Junggar Basin, Northwest China

IF 2.6 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Shiju Liu , Gang Gao , Xiangyun Shi , Wenzhe Gang , Baoli Xiang , Ming Wang , Wenzhi Zhao
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Abstract

This study investigates the effects of different types of primary organic matters on hydrocarbon generation and expulsion of source rocks. Samples representing three typical source rocks from the Lucaogou Formation in the Jimusaer Sag were collected and analyzed by hydrous pyrolysis, total organic carbon, Rock-Eval, gas chromatography-mass spectrometry, organic petrology, and scanning electron microscopy. Distinct differences in crude oil biomarkers were observed between telalginite- and lamalginite-rich source rocks. Telalginite-rich source rocks exhibit higher abundances of pristane, phytane, β-carotane, gammacerane, and C29 regular steranes, while lamalginite-rich source rocks are characterized by enrichments of C24 tetracyclic terpane, C29 hopane, and C28 regular steranes. These biomarkers provide insights into the primary types of organic matter and their depositional environments with high water salinity of telalginite and low salinity of lamalginite. Hydrous pyrolysis results reveal that telalginite-rich source rocks demonstrate early hydrocarbon generation and a wider oil window than lamalginite-rich source rocks. Compared to lamalginite-rich source rocks, telalginite-rich source rocks produced better quality of crude oil, exhibit a smaller specific surface area of organic matter, and greater development of organic-inorganic pores, which contribute to their higher oil expulsion. These findings are helpful to the understanding of the constraints imposed by different primary organic matters on hydrocarbon generation and expulsion of the source rocks, and the insights have significant implications for exploration and development of the shale oil resources.
不同原生有机质组成烃源岩生排烃的地球化学约束——以准噶尔盆地吉木萨尔凹陷芦草沟组为例
研究了不同类型原生有机质对烃源岩生排烃的影响。对吉木萨尔凹陷芦草沟组3个典型烃源岩样品进行了水热解、总有机碳、岩石分析、气相色谱-质谱、有机岩石学和扫描电镜分析。富藻蓝质烃源岩与富藻蓝质烃源岩原油生物标志物存在明显差异。富板藻质烃源岩具有较高的原石烷、植烷、β-胡萝卜烷、-蜡烷和C29规则甾烷丰度,而富板藻质烃源岩具有C24四环萜烷、C29藿烷和C28规则甾烷的富集特征。这些生物标志揭示了藻藻石水体盐度高、斑藻石水体盐度低的有机质主要类型及其沉积环境。含水热解结果表明,富拉藻质烃源岩比富拉藻质烃源岩生烃更早,油窗更宽。与富板藻质烃源岩相比,富板藻质烃源岩原油质量更好,有机质比表面积更小,有机-无机孔隙发育程度更高,排油能力更强。这些发现有助于认识不同原生有机质对烃源岩生排烃的制约作用,对页岩油资源的勘探开发具有重要意义。
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来源期刊
Organic Geochemistry
Organic Geochemistry 地学-地球化学与地球物理
CiteScore
5.50
自引率
6.70%
发文量
100
审稿时长
61 days
期刊介绍: Organic Geochemistry serves as the only dedicated medium for the publication of peer-reviewed research on all phases of geochemistry in which organic compounds play a major role. The Editors welcome contributions covering a wide spectrum of subjects in the geosciences broadly based on organic chemistry (including molecular and isotopic geochemistry), and involving geology, biogeochemistry, environmental geochemistry, chemical oceanography and hydrology. The scope of the journal includes research involving petroleum (including natural gas), coal, organic matter in the aqueous environment and recent sediments, organic-rich rocks and soils and the role of organics in the geochemical cycling of the elements. Sedimentological, paleontological and organic petrographic studies will also be considered for publication, provided that they are geochemically oriented. Papers cover the full range of research activities in organic geochemistry, and include comprehensive review articles, technical communications, discussion/reply correspondence and short technical notes. Peer-reviews organised through three Chief Editors and a staff of Associate Editors, are conducted by well known, respected scientists from academia, government and industry. The journal also publishes reviews of books, announcements of important conferences and meetings and other matters of direct interest to the organic geochemical community.
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