凌源－宁城盆地中元古界铁岭组烃源岩生物标志化合物特征及意义

doi:10.13686/j.cnki.dzyzy.2023.05.004

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摘要采用气相色谱、气相色谱-质谱技术,对凌源-宁城盆地中元古界铁岭组烃源岩生物标志化合物特征进行研究,剖析其蕴含有机质生源、沉积环境、有机质热演化程度等方面的信息及地球化学意义.铁岭组烃源岩饱和烃气相色谱以"前峰型"的单峰分布为主,主峰碳多为nC₁₈,表明有机质来源以低等生物为主;Pr/Ph比值主要分布于0.16~0.73之间,植烷优势较明显,指示为强还原的沉积环境,少部分为还原环境.铁岭组烃源岩具有长侧链三环萜烷丰富、伽马蜡烷含量高和C₂₇甾烷分布占优势的分子化石组合特征,伽马蜡烷指数(Ga/C₃₀H)为0.10~0.31,平均值0.19,反映出铁岭组烃源岩形成于微咸水-半咸水环境;Ts/Tm比值为0.54~1.19,平均值为0.88,表明烃源岩热演化程度较高;甾烷与藿烷的含量比值主要分布于0.24~0.59之间,平均值0.42,表明低等生物藻类的贡献较低,而细菌等微生物的贡献相对较大.铁岭组烃源岩甾烷呈现C₂₇甾烷占优势的"L"型,表明生烃母质生源构成是低等水生生物来源的有机质特征.

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关键词 ：生物标志化合物, 烃源岩, 铁岭组, 中元古界, 凌源-宁城盆地

Abstract：Based on gas chromatography and gas chromatography-mass spectrometry, the paper studies the characteristics of biomarker compounds in the source rocks of Tieling Formation in Lingyuan-ningcheng Basin, and analyzes the organic source, sedimentary environment and thermal evolution degree of organic matter, as well as geochemical implication. The saturated hydrocarbon gas chromatography of source rocks is front-peak type unimodal distribution dominated, with the main peak carbon mostly nC₁₈, indicating that the organic matter is mainly derived from lower organism. The Pr/Ph ratio mainly ranges from 0.16 to 0.73, with obviously more phytane, indicating a strongly reducing sedimentary environment. The source rocks of Tieling Formation are characterized by abundant long-side chain tricyclic terpane, high content of gamacerane and dominant distribution of C₂₇ sterane, with Ga/C₃₀H of 0.10-0.31, averagely 0.19, reflecting the source rocks were formed in slight saline water-brackish water environment. The Ts/Tm ratio of 0.54-1.19 (averagely 0.88) shows the thermal evolution degree of source rocks is relatively high. The ratio of sterane/hopane contents is mainly in the range of 0.24-0.59, averagely 0.42, reflecting the lower organism of algae contributes little to organic matter, while the microorganisms such as bacteria contribute a lot. The sterane in the source rocks are L-shape with dominant C₂₇ sterane, indicating the hydrocarbon generating parent material is of lower aquatic biological organism origin.

Key words： biomarker compound source rock Tieling Formation Mesoproterozoic Lingyuan-Ningcheng Basin

收稿日期: 2021-03-02

PACS:

P618.13

基金资助:中国地质调查局项目"东部重点盆地新区新层系油气资源调查评价""(DD20230078).

通讯作者: 孙求实(1988-),男,高级工程师,主要从事油气基础地质调查研究,通信地址辽宁省沈阳市皇姑区黄河北大街280号,E-mail//70416484@qq.com E-mail: 70416484@qq.com

作者简介: 石蕾(1987-),女,满族,硕士,工程师,从事油气地球化学与砂岩型铀矿地质调查方面研究,通信地址辽宁省沈阳市皇姑区黄河北大街280号,E-mail//shih1101@163.com

引用本文:

石蕾, 宗文明, 孙求实, 郜晓勇, 李永飞, 孙守亮, 张涛. 凌源－宁城盆地中元古界铁岭组烃源岩生物标志化合物特征及意义[J]. 地质与资源, 2023, 32(5): 547-554,615.
SHI Lei, ZONG Wen-ming, SUN Qiu-shi, GAO Xiao-yong, LI Yong-fei, SUN Shou-liang, ZHANG Tao. THE SOURCE ROCKS OF MESOPROTEROZOIC TIELING FORMATION IN LINGYUAN-NINGCHENG BASIN:Biomarker Characteristics and Implication. GEOLOGY AND RESOURCES, 2023, 32(5): 547-554,615.

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