鸡西盆地下白垩统煤系烃源岩生物标志物地球化学特征

高福红; 高红梅; 樊馥

doi:10.11781/sysydz200702188

鸡西盆地下白垩统煤系烃源岩生物标志物地球化学特征

doi: 10.11781/sysydz200702188

吉林大学, 地球科学学院, 长春, 130061

基金项目: 国家油气资源战略选区专项(XQ-2004-07)

详细信息

作者简介:
高福红(1963- ),女(满族),辽宁朝阳人,副教授,博士,从事岩石学和油气地球化学研究.

中图分类号: TE122.1
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出版历程
- 收稿日期: 2006-05-25
- 修回日期: 2007-01-31
- 刊出日期: 2007-03-28

GEOCHEMICAL CHARACTERISTICS OF BIOMARKERS EXTRACTED FROM THE LOWER CRETACEOUS COAL MEASURES ROCKS IN JIXI BASIN

College of Earth Science, Jilin University, Changchun, Jilin 130061, China

摘要

摘要: 应用气相色谱和色谱—质谱等分析方法,对鸡西盆地下白垩统煤系烃源岩的泥岩和煤岩生物标志物进行研究。结果表明,泥岩正构烷烃为前高单峰型,主峰碳为C₁₆或C₁₈,Pr/Ph分布于1.16-2.90,Pr/nC₁₇大于1;煤岩正构烷烃为后高单峰型,主峰碳为C₂₃或C₂₂,Pr/Ph分布于2.86-11.22,Pr/nC₁₇为2.1-3.33;泥岩和煤岩OEP和CPI值集中在1.0附近,已进入成熟阶段。生标中泥岩三、四环萜烷/C₃₀藿烷比值为2.37-3.62,C₃₁22S/22(S+R)值为0.57-0.61,Ts/Tm为0.47-0.81,γ-蜡烷/C₃₀藿烷为0.11-0.34之间,规则甾烷内ααα20R构型呈"V"型分布,母质来源以水生生物为主,形成于还原环境,沉积介质咸化程度高,有利于有机质的保存和转化;煤岩三、四环萜烷/C₃₀藿烷比值低于泥岩,C₃₁22S/22(S+R)值在0.6附近,Ts/Tm和γ-蜡烷/C₃₀藿烷值极低,规则甾烷ααα20R构型分布呈反"L"型,母质来源以高等植物为主,形成于氧化环境,经历了较强的降解作用。
- 泥岩 /
- 煤岩 /
- 生物标志化合物 /
- 下白垩统 /
- 鸡西盆地
Abstract: By the Gas chromatography and the Gas chromatography-mass spectrogram analysis,the biomarkers in the Lower Cretaceous mud rocks and coals of coal measures from Jixi Basin were studied.The results indicate that n-alkanes in mud rocks show front single-peak type,with the main peak carbons to be C₁₆ or C₁₈.The ratio of Pr/Ph is 2.86～11.22,Pr/n C₁₇ is larger than 1.The n-alkanes in coals show rear single-peak type,with the main peak carbons to be C₂₂ or C₂₃.The ratios of Pr/Ph and Pr/n C₁₇ are 2.86～11.22 and 2.1～3.33 respectively.The values of the OEP and CPI in both mud rocks and coals concentrale on 1.0.The thermal evolution has reached maturation stage.The biomarkers in mud rocks show that the ratio of tricycle terpane plus tetracyclic terpane to C₃₀H is 2.37～3.62.The C₃₁22S/22(S+R),Ts/Tm and G/C₃₀H are 0.57～0.61,0.47～0.81 and 0.11～0.34 respectively.The ααα20R homosteranes in mud rocks appears to be in asymmetrical "V"distribution.The analytic result of the biomarkers show the mud rocks coming mainly from aquatic organisms and depositing in reducing environment with more saline water,which is better for preservation and transformation of organics.The biomarkers in coals show that the ratio of tricycle terpane plus tetracyclic terpane to C₃₀H is lower than that in mud rocks.The ratio of C₃₁22S/22(S+R) is about 0.6,the Ts/Tm and G/C₃₀H are very low.The ααα20R homosteranes of coals appear to be in inverted "L" distribution.The coals are mainly from higher plants,and deposit in oxidizing environment.
- mud rock /
- coal /
- biomarkers /
- the Lower Cretaceous /
- Jixi Basin

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