准噶尔盆地吉南凹陷二叠系芦草沟组烃源岩地球化学特征及油源分析

温旺彪; 赵红静; 王志勇; 金颖; 王杰; 甘应星; 刘锋; 郭雅婷

doi:10.19509/j.cnki.dzkq.tb20240443

准噶尔盆地吉南凹陷二叠系芦草沟组烃源岩地球化学特征及油源分析

doi: 10.19509/j.cnki.dzkq.tb20240443

1.
长江大学油气地球化学与环境湖北省重点实验室，武汉 430100
2.
中国石油吐哈油田分公司勘探开发研究院，新疆哈密 650500

基金项目: 国家自然科学基金项目（41302121，42072119）

详细信息

作者简介:
温旺彪：E-mail：510090148@qq.com

通讯作者:
E-mail：zhaohjdh@yangtzeu.edu.cn

中图分类号: P618.13
计量
- 文章访问数: 145
- PDF下载量: 9
- 被引次数: 0
出版历程
- 收稿日期: 2024-08-10
- 录用日期: 2024-10-23
- 修回日期: 2024-10-17
- 网络出版日期: 2024-10-23

Oil-source correlations and geochemical characteristics of source rock from Permian Lucaogou Formation in Jinan Sag, Junggar Basin

1.
Hubei Key Laboratory of Petroleum Geochemistry and Environment, School of Resources and Environment, Yangtze University, Wuhan 430100, China
2.
Research Institute of Exploration and Development, Petro China Tuha Oilfield Company, Hami Xinjiang 650500, China

More Information

Author Bio:
E-mail：510090148@qq.com

Corresponding author: E-mail：zhaohjdh@yangtzeu.edu.cn

摘要

摘要:
近年，准噶尔盆地吉南凹陷井井子沟组常规砂岩油藏勘探取得重要进展，三级储量过亿吨，勘探潜力巨大，中二叠统芦草沟组作为凹陷内主力源岩层，目前研究相对薄弱。利用多项地球化学测试手段，对芦草沟组不同层段烃源岩地球化学特征进行对比，并据此厘定了二叠系油气来源。结果表明：①依据测井曲线特征可将芦草沟组分为3段，其中芦一、芦二段发育“优质”质量烃源岩，母质类型为Ⅰ-Ⅱ₁型，处于低熟−成熟阶段，且芦二段生烃能力更强；芦三段主体为“非−一般”烃源岩，母质类型亦为Ⅰ-Ⅱ₁型，受上覆火成岩影响，局部成熟度较高。②基于分子地球化学特征，芦草沟组沉积期整体处于偏还原环境中，有机质保存条件较好，但不同层段水体咸化程度有异，芦一段>芦三段>芦二段。在生物组成方面，证明了芦草沟组存在绿藻和蓝细菌（蓝藻）2种特征生烃母质，前者证据是与年代相关的生物标志物（C₂₈甾烷），后者为β-胡萝卜烷和中链单甲基烷烃的检出，芦一、芦三段成烃生物中显示出蓝藻的主要贡献，芦二段则具有较高的绿藻和陆源高等植物输入，湖盆水体盐度的差异是影响蓝、绿藻繁盛的关键因素。③芦一和芦二段烃源岩具有特征的高丰度C₃₀αα-藿烷（受控于热演化程度），C₃₀αα/αβ有望成为判识成熟度的新指标。④吉南凹陷二叠系存在3种类别不同的原油，A、B类原油分别对应芦一和芦二段烃源岩，C类原油显示非芦草沟组油源特征，主要来自井井子沟组上部泥岩。研究成果对吉南凹陷未来油气勘探与开发具有参考意义。
- 油源对比 /
- 地球化学特征 /
- 芦草沟组 /
- 吉南凹陷
Abstract: Objective
In recent years, significant progress has been made in the exploration of conventional sandstone reservoirs in Jingjingzigou Formation, Jinan Depression, Junggar Basin, with tertiary reserves exceeding 100 million tons and excellent exploration prospect. Although the main source rock as Lucaogou Formation of Middle Permian in Jinan Depression has been realized based on former research, the study on geochemical characteristics of source rocks and oil source correlation have been rarely reported.
Methods
Based on comprehensive utilization of test data such as total organic carbon, rock pyrolysis and characteristics of biomarkers,The geochemical characteristics of source rocks in different intervals of Lucaogou Formation and oils source correlation of Middle Permian have been studied in this paper.
Results
The results show that:①Lucaogou Formation can be divided into three sections according to the characteristics of logging curves. P₂l₁ and P₂l₂ are excellent with high organic carbon content, hydrocarbon generation potential and soluble organic matter content, organic matter type asⅠ-Ⅱ₁ and maturity as early to peak, while P₂l₂ is better. The main of P₂l₃ is "non-general" source rock withⅠ-Ⅱ₁ organic matter type and high maturity affected by overlying.②General reduced environments with P₂l₁ as stratified saline water and P₂l₂ as fresh-brackish water, P₂l₃ is somewhere in between.beneficial to the preservation of organic matter are indicated by the molecular geochemical characteristics of source rocks. In terms of biological composition, it is proved that there are two characteristic hydrocarbon-generating parent materials in Lucaogou Formation, namely, green algae and cyanobacteria. The former evidence is a biomarker (C₂₈ sterane) related to age, while the latter is the detection of β -carotene and medium-chain monomethyl alkane, Hydrocarbon-generating organisms in different intervals are different with P₂l₁ and P₂l₃ mainly composed of aquatic organisms such as bacteria and algae, and cyanobacteria dominate, while P₂l₂ of high input of aquatic plants(green algae) and terrestrial plants. Differences in water salinity in lake basins are the key factors that affect the bloom of cyanobacteria and green algae in different layers of source rocks.③C₃₀αα- hopane was abundant in P₂l₁ and P₂l₂, but is lacking in the source rocks of P₂l₃, Based on the analysis of different isomerization parameters of sterane and hopane,C₃₀αα/αβ may be a possibe maturity parameter.④the Permian crude oil in Jinan Depression can be divided into three types. Type Ⅰ and Ⅱcrude oils were correspond to the source rocks of P₂l₁ and P₂l₂ respectively, and Type Ⅲ crude oil is different to P₂l source rocks, possibly correlated tomudstone of Jingjingzigou formation.
Conclusion
The research has reference significance for future oil and gas exploration and development in Jinan sag.
- oil source correlation /
- Geochemical characteristics /
- Lucaogou Formation /
- Jinan Depression

HTML全文

图 1 吉南凹陷区域地质构造及取样井位图（据文献[8]修改）

Figure 1. Regional geological structure and sampling well map in Jinan sag (modified from References [8]）

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图 2 吉南凹陷中二叠统芦草沟组连井剖面

Figure 2. Connecting Well Profile of Middle Permian Lucaogou Formation in Jinan sag

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图 3 吉南凹陷芦草沟组烃源岩有机质丰度评价

Figure 3. Evaluation of organic matter abundance of source rocks of Lucaogou Formation in Jinan sag

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图 4 吉南凹陷芦草沟组烃源岩有机质类型划分（Ⅰ，Ⅱ₁，Ⅱ₂和Ⅲ均为有机质类型编号；下同）

Figure 4. Classification of organic matter types of source rocks of Lucaogou Formation in Jinan Depression

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图 5 Pr/nC₁₇−Ph/nC₁₈关系图

Figure 5. Cross plot of Pr/nC₁₇ vs. Ph/nC₁₈

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图 6 吉南凹陷芦草沟组不同层段烃源岩生物标志物质量色谱图（TIC为总离子流图；m/z为质荷比）

Figure 6. Mass chromatogram of biomarkers of source rocks in different intervals of Lucaogou Formation in Jinan Sag

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图 7 Pr/Ph−Ga/C₃₀H关系图

Figure 7. Cross plot of Pr/Ph vs. Ga/C₃₀H

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图 8 鄂尔多斯盆地下奥陶统碳酸盐岩样品抽提物及下马岭组页岩干酪根热解产物中正构烷烃分布（据文献[31]修改）

Figure 8. Distribution of n-alkanes in Lower Ordovician carbonate samples in Ordos Basin(a) and kerogen pyrolysis products of Xiamaling Formation shale(b) (modified from References[31]）

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图 9 C₂₄TeT/C₂₆TT和C₁₉+₂₀TT/C₂₁TT关系图

Figure 9. Cross plot of C₂₄TeT/C₂₆TT vs. C₁₉+₂₀TT/C₂₁TT

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图 10 芦草沟组烃源岩典型样品的7-+8-单甲基十七烷质量色谱图

Figure 10. mass chromatogram of 7- + 8- monomethyl hepadecanes of source rocks of Lucaogou Formation in Jinan sag

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图 11 芦草沟组烃源岩成烃生物判别图

Figure 11. Identification map of biological source rocks of Lucaogou Formation

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图 12 不同耐盐生物的典型盐度范围(据文献[43]修改)

Figure 12. Typical salinity range of halotolerant organisms（modified from References [43]）

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图 13 绿藻丰度随盐度变化相关关系

Figure 13. Relation between Green Algae and Water Salinity

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图 14 吉南凹陷芦草沟组烃源岩成熟度评价

Figure 14. Maturity Evaluation of Source Rock of Lucaogou Formation in Jinan sag

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图 15 吉南凹陷芦草沟组烃源岩典型样品中C₃₀αα-藿烷分布

Figure 15. Distribution of C₃₀αα-hopane in typical source rocks of Lucaogou Formation in Jinan sag

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图 16 C₃₀ αα/αβ与不同成熟度指标相关关系图

Figure 16. Correlation diagram of C₃₀ αα/αβ and different maturity indexes

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图 17 吉南凹陷二叠系不同类型原油饱和烃色谱

Figure 17. Saturated hydrocarbon chromatography of different types of Permian crude oil in Jinan sag

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图 18 芦草沟组烃源岩与不同类型原油成熟度关系图

Figure 18. Relationship between source rocks of Lucaogou Formation and maturity of three types of crude oil

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图 19 芦草沟组烃源岩与不同类型原油油源对比关系图

Figure 19. Correlation diagram of source rocks of Lucaogou Formation and different types of crude oil sources

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表 1 吉南凹陷芦草沟组烃源岩有机地球化学数据

Table 1. Geochemical parameters of source rocks of Lucaogou Formation in Jinan sag

层位	w(TOC)/%	T_max/(℃)	(S₁+S₂)/(mg·g)⁻¹	I_H/(mg·g)⁻¹	D/%	R_o/%	w(氯仿沥青“A”)/%
芦三段P₂l₃	$ \dfrac{0.52\sim1.67}{0.96(9)} $	$ \dfrac{{436}{\sim}{500}}{{461}{(}{9}{)}} $	$ \dfrac{{0.16}{\sim}{0.51}}{{0.33}{(}{9}{)}} $	$ \dfrac{{13.51}{\sim}{87.04}}{{37.13}{(}{9}{)}} $	$ \dfrac{{1.26}{\sim}{7.53}}{{3.42}{(}{9}{)}} $	$ \dfrac{{1.25}{\sim}{1.36}}{{1.30}{(}{4}{)}} $	$ \dfrac{{0.01}{\sim}{0.09}}{{0.04}{(}{6}{)}} $
芦二段P₂l₂	$ \dfrac{{2.21}{\sim}{24.70}}{{8.61}{(}{46}{)}} $	$ \dfrac{{433}{\sim}{448}}{{442}{(}{46}{)}} $	$ \dfrac{{12.33}{\sim}{238.26}}{{64.90}{(}{46}{)}} $	$ \dfrac{{358.01}{\sim}{960.51}}{{667.99}{(}{46}{)}} $	$ \dfrac{{30.44}{\sim}{82.85}}{{58.31}{(}{46}{)}} $	$ \dfrac{{0.56}{\sim}{0.91}}{{0.75}{(}{22}{)}} $	$ \dfrac{{0.15}{\sim}{2.48}}{{0.64}{(}{36}{)}} $
芦一段P₂l₁	$ \dfrac{{2.81}{\sim}{11.51}}{{5.62}{(}{10}{)}} $	$ \dfrac{{431}{\sim}{442}}{{438}{(}{10}{)}} $	$ \dfrac{{13.71}{\sim}{86.19}}{{37.56}{(}{10}{)}} $	$ \dfrac{{404.98}{\sim}{854.78}}{{595.64}{(}{10}{)}} $	$ \dfrac{{40.14}{\sim}{72.70}}{{51.82}{(}{10}{)}} $	$ \dfrac{{0.64}{\sim}{0.66}}{{0.65}{(}{3}{)}} $	$ \dfrac{{0.30}{\sim}{0.47}}{{0.38}{(}{3}{)}} $
注：w（TOC）= [0.83×（S₀+S₁+S₂）+S₄]/10；S₀为气态烃；S₁为游离烃；S₂为热解烃；S₄为有机二氧化碳；T_max为最大热解峰温；I_H为氢指数，HI=S₂/w（TOC）×100%；D为降解率，D=CP/w（TOC）*100%；R_o为镜质体反射率；w（氯仿沥青“A”）为可溶有机质抽提含量；$ \dfrac{0.52\sim1.67}{0.96(9)} $为$\dfrac{平均值 \sim 最大值}{平均值(样品个数)} $；下同

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表 2 吉南凹陷芦草沟组（P₂l）烃源岩生物标志化合物参数统计

Table 2. Parameter statistics of biomarkers in source rocks of Lucaogou Formation in Jinan Sag

	nC₂₁-/nC₂₂+	TAR	短链/%	中链/%	长链/%	7-+8-MeC₁₇/nC_max	Pr/Ph
芦三段P₂l₃	$ \dfrac{{0.44}{\sim}{1.22}}{{0.80}{(}{7}{)}} $	$ \dfrac{{0.38}{\sim}{1.43}}{{0.79}{(}{7}{)}} $	$ \dfrac{{23.37}{\sim}{46.93}}{{34.97}{(}{7}{)}} $	$ \dfrac{{38.52}{\sim}{55.39}}{{45.31}{(}{7}{)}} $	$ \dfrac{{14.18}{\sim}{28.19}}{{19.75}{(}{7}{)}} $	$ \dfrac{{0.01}{\sim}{0.27}}{{0.12}{(}{7}{)}} $	$ \dfrac{{0.38}{\sim}{0.99}}{{0.74}{(}{7}{)}} $
芦二段P₂l₂	$ \dfrac{{0.33}{\sim}{1.14}}{{0.63}{(}{29}{)}} $	$ \dfrac{{0.30}{\sim}{2.14}}{{0.95}{(}{29}{)}} $	$ \dfrac{{17.52}{\sim}{42.36}}{{28.60}{(}{29}{)}} $	$ \dfrac{{44.63}{\sim}{57.40}}{{50.28}{(}{29}{)}} $	$ \dfrac{{10.78}{\sim}{33.53}}{{20.82}{(}{29}{)}} $	$ \dfrac{{0.01}{\sim}{0.28}}{{0.05}{(}{29}{)}} $	$ \dfrac{{0.60}{\sim}{1.05}}{{0.84}{(}{29}{)}} $
芦一段P₂l₁	$ \dfrac{{1.64}{\sim}{2.55}}{{2.07}{(}{4}{)}} $	$ \dfrac{{0.19}{\sim}{0.34}}{{0.25}{(}{4}{)}} $	$ \dfrac{{53.06}{\sim}{64.24}}{{58.20}{(}{4}{)}} $	$ \dfrac{{25.93}{\sim}{33.25}}{{30.48}{(}{4}{)}} $	$ \dfrac{{8.65}{\sim}{14.31}}{{11.01}{(}{4}{)}} $	$ \dfrac{{0.13}{\sim}{0.36}}{{0.21}{(}{4}{)}} $	$ \dfrac{{0.48}{\sim}{1.09}}{{0.84}{(}{4}{)}} $

	Pr/nC₁₇	Ph/nC₁₈	β-胡萝卜烷/nC_max	伽马蜡烷/C₃₀藿烷	C₂₄TeT/C₂₆TT	C₁₉TT+C₂₀TT/C₂₁TT	C₃₁22S/(22S+22R)
芦三段P₂l₃	$ \dfrac{{0.57}{\sim}{0.79}}{{0.71}{(}{7}{)}} $	$ \dfrac{{0.47}{\sim}{1.25}}{{0.77}{(}{7}{)}} $	$ \dfrac{{0.11}{\sim}{0.93}}{{0.42}{(}{7}{)}} $	$ \dfrac{{0.22}{\sim}{0.30}}{{0.25}{(}{7}{)}} $	$ \dfrac{{0.82}{\sim}{0.92}}{{0.86}{(}{7}{)}} $	$ \dfrac{{0.61}{\sim}{1.39}}{{1.05}{(}{7}{)}} $	$ \dfrac{{0.58}{\sim}{0.61}}{{0.60}{(}{7}{)}} $
芦二段P₂l₂	$ \dfrac{{0.22}{\sim}{2.29}}{{0.73}{(}{29}{)}} $	$ \dfrac{{0.18}{\sim}{5.01}}{{0.94}{(}{29}{)}} $	$ \dfrac{{0.00}{\sim}{1.75}}{{0.35}{(}{29}{)}} $	$ \dfrac{{0.07}{\sim}{0.29}}{{0.20}{(}{29}{)}} $	$ \dfrac{{0.63}{\sim}{2.78}}{{1.51}{(}{29}{)}} $	$ \dfrac{{0.85}{\sim}{2.00}}{{1.36}{(}{29}{)}} $	$ \dfrac{{0.47}{\sim}{0.54}}{{0.52}{(}{29}{)}} $
芦一段P₂l₁	$ \dfrac{{0.85}{\sim}{1.26}}{{1.02}{(}{4}{)}} $	$ \dfrac{{1.39}{\sim}{4.36}}{{2.22}{(}{4}{)}} $	$ \dfrac{{1.06}{\sim}{3.59}}{{1.86}{(}{4}{)}} $	$ \dfrac{{0.40}{\sim}{0.42}}{{0.41}{(}{4}{)}} $	$ \dfrac{{0.98}{\sim}{1.05}}{{1.01}{(}{4}{)}} $	$ \dfrac{{0.78}{\sim}{1.23}}{{0.97}{(}{4}{)}} $	$ \dfrac{{0.49}{\sim}{0.51}}{{0.50}{(}{4}{)}} $

	C₂₉ββ/(ββ+αα)	C₂₉20S/(20S+20R)	C₃₀αα/αβ	甾烷/藿烷	C₂₇St/%	C₂₈St/%	C₂₉St/%
芦三段P₂l₃	$ \dfrac{{0.36}{\sim}{0.44}}{{0.39}{(}{7}{)}} $	$ \dfrac{{0.47}{\sim}{0.52}}{{0.49}{(}{7}{)}} $	$ \dfrac{{0.04}{\sim}{0.05}}{{0.04}{(}{7}{)}} $	$ \dfrac{{0.22}{\sim}{0.31}}{{0.26}{(}{7}{)}} $	$ \dfrac{{12.34}{\sim}{20.33}}{{15.78}{(}{7}{)}} $	$ \dfrac{{32.54}{\sim}{39.38}}{{37.10}{(}{7}{)}} $	$ \dfrac{{44.78}{\sim}{50.18}}{{47.41}{(}{7}{)}} $
芦二段P₂l₂	$ \dfrac{{0.18}{\sim}{0.27}}{{0.22}{(}{29}{)}} $	$ \dfrac{{0.14}{\sim}{0.26}}{{0.20}{(}{29}{)}} $	$ \dfrac{{0.06}{\sim}{0.11}}{{0.09}{(}{29}{)}} $	$ \dfrac{{0.12}{\sim}{0.55}}{{0.30}{(}{29}{)}} $	$ \dfrac{{12.43}{\sim}{26.39}}{{18.28}{(}{29}{)}} $	$ \dfrac{{32.56}{\sim}{55.15}}{{41.62}{(}{29}{)}} $	$ \dfrac{{28.85}{\sim}{51.56}}{{39.85}{(}{29}{)}} $
芦一段P₂l₁	$ \dfrac{{0.23}{\sim}{0.26}}{{0.25}{(}{4}{)}} $	$ \dfrac{{0.15}{\sim}{0.23}}{{0.19}{(}{4}{)}} $	$ \dfrac{{0.09}{\sim}{0.11}}{{0.10}{(}{4}{)}} $	$ \dfrac{{0.32}{\sim}{0.40}}{{0.36}{(}{4}{)}} $	$ \dfrac{{8.33}{\sim}{14.22}}{{11.90}{(}{4}{)}} $	$ \dfrac{{33.22}{\sim}{43.36}}{{38.44}{(}{4}{)}} $	$ \dfrac{{43.76}{\sim}{55.11}}{{49.66 (4)}} $

	C₂₈/ C₂₉St/%	C₃₅/(C₃₁-C₃₅)	MPR	MPI-3	∑三环萜烷/∑藿烷	C₂₁₊₂₂孕甾烷/规则甾烷	C₂₉降霍烷/C₂₉降莫烷
芦三段P₂l₃	$ \dfrac{{0.65}{\sim}{0.88}}{{0.78}{(}{7}{)}} $	$ \dfrac{{0.03}{\sim}{0.06}}{{0.05}{(}{7}{)}} $	$ \dfrac{{1.57}{\sim}{1.89}}{{1.72}{(}{7}{)}} $	$ \dfrac{{1.01}{\sim}{1.31}}{{1.18}{(}{7}{)}} $	$ \dfrac{{0.11}{\sim}{0.25}}{{0.17}{(}{7}{)}} $	$ \dfrac{{0.14}{\sim}{0.24}}{{0.18}{(}{7}{)}} $	$ \dfrac{{6.17}{\sim}{7.90}}{{6.94}{(}{7}{)}} $
芦二段P₂l₂	$ \dfrac{{0.68}{\sim}{1.91}}{{1.01}{(}{29}{)}} $	$ \dfrac{{0.03}{\sim}{0.06}}{{0.04}{(}{29}{)}} $	$ \dfrac{{0.74}{\sim}{1.26}}{{0.99}{(}{24}{)}} $	$ \dfrac{{0.60}{\sim}{0.97}}{{0.78}{(}{24}{)}} $	$ \dfrac{{0.03}{\sim}{0.16}}{{0.07}{(}{29}{)}} $	$ \dfrac{{0.02}{\sim}{0.08}}{{0.03}{(}{29}{)}} $	$ \dfrac{{2.65}{\sim}{4.44}}{{3.60}{(}{29}{)}} $
芦一段P₂l₁	$ \dfrac{{0.60}{\sim}{1.00}}{{0.79}{(}{4}{)}} $	$ \dfrac{{0.06}{\sim}{0.08}}{{0.07}{(}{4}{)}} $	$ \dfrac{{0.50}{\sim}{1.24}}{{0.86}{(}{4}{)}} $	$ \dfrac{{0.71}{\sim}{0.83}}{{0.74}{(}{4}{)}} $	$ \dfrac{{0.04}{\sim}{0.08}}{{0.06}{(}{4}{)}} $	$ \dfrac{{0.01}{\sim}{0.08}}{{0.03}{(}{4}{)}} $	$ \dfrac{{2.56}{\sim}{3.21}}{{2.86}{(}{4}{)}} $
注：TAR为陆水生比值，TAR=(nC₂₇+nC₂₉+nC₃₁)/(nC₁₅ + nC₁₇ + nC₁₉)；短链= [∑(nC₁₄-nC₂₀)/∑(nC_min-nC_max)]×100%；中链= [∑(nC₂₁-nC₂₆)/∑(nC_min-nC_max)]×100% ；长链= [∑(nC₂₇-nC₄₀)/∑(nC_min-nC_max)]×100%；Me为单甲基十七烷；Pr为姥姣烷；Ph为植烷；nC_max为正构烷烃主峰碳；TeT为四环萜烷；TT为三环萜烷；C₃₀αα为C_30-αα藿烷；C₃₀αβ为C30-αβ藿烷；St为规则甾烷；C₃₅/(C₃₁-C₃₅)为升藿烷指数；MP为甲基菲；MPR=2-MP/1-MP；MPI-3=(3-MP+2-MP)/(9-MP+1-MP)；MPR为甲基菲比值；MPI-3为甲基菲指数；1-MP为1-甲基菲；2-MP为2-甲基菲；3-MP为3-甲基菲；9-MP为9-甲基菲；下同

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表 3 吉南凹陷二叠系不同类型原油生物标志化合物数据

Table 3. Data of Biomarker Compounds in Different Types of Permian Crude Oil in Jinan Sag

		C₂₉ββ/ββ+αα	C₂₉20S/(20S+20R)	MPR	MPI-3	nC₂₁-/nC₂₂+	C₂₉降霍烷/C₂₉降莫烷
原油类别	A	$ \dfrac{{0.22}{\sim}{0.26}}{{0.24}{(}{4}{)}} $	$ \dfrac{{0.18}{\sim}{0.22}}{{0.20}{(}{4}{)}} $	$ \dfrac{{0.95}{\sim}{1.44}}{{1.15}{(}{3}{)}} $	$ \dfrac{{0.65}{\sim}{0.80}}{{0.75}\left({3}\right)} $	$ \dfrac{{1.25}{\sim}{2.57}}{{1.89}{(}{4}{)}} $	$ \dfrac{{2.43}{\sim}{3.04}}{{2.82(4)}} $
	B	$ \dfrac{{0.21}{\sim}{0.38}}{{0.29}{(}{42}{)}} $	$ \dfrac{{0.14}{\sim}{0.40}}{{0.29}{(}{42}{)}} $	$ \dfrac{{0.62}{\sim}{1.20}}{{0.91(35)}} $	$ \dfrac{{0.46}{\sim}{0.96}}{{0.66}\left({35}\right)} $	$ \dfrac{{0.31}{\sim}{1.13}}{{0.65}{(}{42}{)}} $	$ \dfrac{{2.46}{\sim}{6..65}}{{4.90(42)}} $
	C	$ \dfrac{{0.28}{\sim}{0.39}}{{0.34}{(}{4}{)}} $	$ \dfrac{{0.29}{\sim}{0.39}}{{0.34}{(}{4}{)}} $	$ \dfrac{{0.90}{\sim}{0.99}}{{0.95}{(}{2}{)}} $	$ \dfrac{{0.75}{\sim}{0.81}}{{0.78}{(}{2}{)}} $	$ \dfrac{{2.32}{\sim}{4.62}}{{3.33}{(}{4}{)}} $	$ \dfrac{{4.16}{\sim}{6.42}}{{5.26(4)}} $

		TAR	伽马蜡烷/C₃₀藿烷	Pr/Ph	C₂₁₊₂₂孕甾烷/规则甾烷	∑三环萜烷/∑藿烷	C₃₀ αα/αβ
原油类别	A	$ \dfrac{{0.13}{\sim}{0.41}}{{0.26}{(}{4}{)}} $	$ \dfrac{{0.40}{\sim}{0.55}}{{0.50}{(}{4}{)}} $	$ \dfrac{{0.31}{\sim}{0.97}}{{0.68}{(}{4}{)}} $	$ \dfrac{{0.01}{\sim}{0.03}}{{0.02}{(}{4}{)}} $	$ \dfrac{{0.11}{\sim}{0.20}}{{0.15}{(}{4}{)}} $	$ \dfrac{{0.09}{\sim}{0.12}}{{0.10}{(}{4}{)}} $
	B	$ \dfrac{{0.32}{\sim}{2.28}}{{0.92}{(}{42}{)}} $	$ \dfrac{{0.15}{\sim}{0.29}}{{0.23}{(}{42}{)}} $	$ \dfrac{{0.62}{\sim}{1.22}}{{0.87}{(}{42}{)}} $	$ \dfrac{{0.01}{\sim}{0.04}}{{0.02}{(}{42}{)}} $	$ \dfrac{{0.05}{\sim}{0.28}}{{0.14}{(}{42}{)}} $	$ \dfrac{{0.05}{\sim}{0.12}}{{0.08}{(}{42}{)}} $
	C	$ \dfrac{{0.02}{\sim}{0.08}}{{0.05}{(}{4}{)}} $	$ \dfrac{{0.23}{\sim}{0.27}}{{0.26}{(}{4}{)}} $	$ \dfrac{{0.84}{\sim}{1.10}}{{0.93}{(}{4}{)}} $	$ \dfrac{{0.15}{\sim}{0.34}}{{0.27}{(}{4}{)}} $	$ \dfrac{{0.79}{\sim}{1.40}}{{1.19}{(}{4}{)}} $	$ \dfrac{{0.06}{\sim}{0.08}}{{0.07}{(}{4}{)}} $

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表 4 吉南凹陷井井子沟组烃源岩有机地球化学数据

Table 4. Organic geochemical data of source rocks of Jingjingzigou Formation in Jinan Depression

层位	w(TOC)/%	S₁/(mg·g)⁻¹	S₂/(mg·g)⁻¹	PG/(mg·g)⁻¹	I_H/(mg·g)⁻¹	T_max(℃)	优质烃源岩占比/%
井井子沟组	$ \dfrac{{0.14}{\sim}{4.14}}{{1.25}{(}{25}{)}} $	$ \dfrac{{0.04}{\sim}{13.70}}{{7.32}{(}{25}{)}} $	$ \dfrac{{0.14}{\sim}{29.93}}{{5.08}{(}{25}{)}} $	$ \dfrac{{0.18}{\sim}{28.91}}{{7.32}{(}{25}{)}} $	$ \dfrac{{86.90}{\sim}{977.29}}{{338.46}{(}{25}{)}} $	$ \dfrac{{423}{\sim}{447}}{{436}{(}{25}{)}} $	48

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