烃源岩抽提物中藿烷分子碳同位素分析新方法及指示意义

鲁中灯; 刘岩; 陈祖林; 樊云鹏; 文志刚; 徐耀辉; 牛金; 田永晶; 柳波; 谢小敏; 谢巍

doi:10.11781/sysydz202202288

烃源岩抽提物中藿烷分子碳同位素分析新方法及指示意义

doi: 10.11781/sysydz202202288

1.
油气与环境地球化学湖北省重点实验室(长江大学资源与环境学院), 武汉 430100
2.
山东省地质矿产勘查开发局第五地质大队, 山东泰安 250013
3.
东北石油大学非常规油气研究院, 黑龙江大庆 163000
4.
中国石油塔里木油田分公司实验检测研究院, 新疆库尔勒 841000

基金项目:

国家自然科学基金项目 41503034

国家自然科学基金项目 41972122

国家科技重大专项 2017ZX05001005

中国地质调查局项目 20190085

详细信息

作者简介:
鲁中灯，男(1997—)，在读硕士研究生，油气地球化学与同位素地球化学专业。E-mail：1733830652@qq.com

通讯作者:
刘岩，男(1985—)，副教授，从事有机地球化学与非常规油气地质的教学与研究工作。E-mail：mail_liuyan@qq.com

中图分类号: TE135
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出版历程
- 收稿日期: 2021-05-10
- 修回日期: 2022-02-09
- 刊出日期: 2022-03-28

An improved method and indications for the compound specific isotopic analysis of hopanes in source rock extracts

1.
Hubei Key Laboratory of Petroleum and Environmental Geochemistry (School of Resources and Environment, Yangtze University), Wuhan, Hubei 430100, China
2.
No.5 Geological Brigade, Shandong Bureau of Geology and Mineral Exploration and Development, Taian, Shandong 250013, China
3.
Institute of Unconventional Oil and Gas, Northeast Petroleum University, Daqing, Heilongjiang 163000, China
4.
Research Institute of Experimental Detection, Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China

摘要

摘要: 以5Å分子筛/氧化铝混合填料的层析柱对烃源岩抽提物进行了分离，成功获取了以藿烷类化合物为主的亚组分，可直接用于单化合物碳同位素分析。通过对典型海、陆相烃源岩中的藿烷碳同位素特征进行对比研究，结果表明准噶尔盆地二叠系芦草沟组湖相页岩中藿烷系列单体化合物的碳同位素值(δ¹³C)分布在-40.7‰~-62.7‰，且呈现出随着碳数的增加同位素值变轻的特点；而川西北二叠系海相页岩中藿烷化合物δ¹³C则相对较重，分布在-20.5‰~-45.4‰，具有随碳数增加先变轻再变重的趋势。两类页岩中藿烷类化合物的碳同位素变化幅度可达±20‰以上，尤其是川西北二叠系海相页岩中藿烷类化合物单体碳同位素的差异可达到±24.9‰，表明藿烷类化合物具有明显的多源特征。藿烷类化合物的分子碳同位素受到原始沉积环境、母质来源与演化过程的影响而可能具有较大的差异，但这并不影响其有望成为新的油源对比指标。
- 细菌 /
- 藿烷化合物 /
- 单体碳同位素 /
- 海相烃源岩 /
- 陆相烃源岩 /
- 四川盆地 /
- 准噶尔盆地
Abstract: With a mixed stationary phase of 5Å molecular sieve/alumina, extracts of various kinds of source rocks are separated by column and sub-fractions dominated by hopanoid compounds were successfully obtained. The sub-fractions are suitable for the direct analysis on GC-IRMS to obtain compound specific isotopic values of hopanes. Comparison is carried out on isotopic signatures of specific hopanes in a lacustrine oil shale (Permian Lucaogou shale, Junggar Basin, NW China) and another Permian marine shale (NW of Sichuan Basin). Results show that the Permian Lucaogou shale had the δ¹³C values of hopanes distributed between -40.7‰ and -62.7‰, and decrease with the increasing of carbon number. The δ¹³C values of hopanes in marine shale of Sichuan Basin are apparently heavier, distribute between -20.5‰ and -45.4‰, and they appeared to be firstly decreased and then increased as carbon number increases. In both of the shales analyzed, the variation range of carbon isotopes of hopanes can be more than ±20‰ (±24.9‰ for the Sichuan Basin shale), which indicates multiple contribution to these compounds. The isotopic signatures of hopanes may be constrained by paleoenvironment, sources as well as maturation, however, compound specific isotope of hopanes is still a useful indicator for oil-source correlation.
- bacteria /
- hopanoid compounds /
- carbon isotope /
- marine source rock /
- continental source rocks /
- Sichuan Basin /
- Junggar Basin

HTML全文

图 1 四川盆地海相页岩(KSL)和准噶尔盆地湖相页岩(J36)地球化学特征

Figure 1. Geochemical characteristics of KSL marine shale in Sichuan Basin and J36 lacustrine shale in Junggar Basin

下载: 全尺寸图片幻灯片

图 2 柱色谱法分离准噶尔盆地二叠系芦草沟组湖相烃源岩藿烷化合物效果图

1.18α(H)-22, 29, 30-C₂₇(Ts)；2.17α(H)-22, 29, 30-C₂₇(Tm)；3.C₂₉αβ；4.C₂₉Ts；5.C₂₉βα；6.C₃₀αβ；7.C₃₀βα；8.伽马蜡烷

Figure 2. Extracted hopanes with chromatographic column separation of lacustrine source rocks from Permian Lucaogou Formation, Junggar Basin

下载: 全尺寸图片幻灯片

图 3 准噶尔盆地二叠系芦草沟组湖相烃源岩藿烷化合物GC-IRMS测定谱图

图中数字表示的化合物见图 2。

Figure 3. GC-IRMS chromatogram of hopanes in lacustrine source rocks from Permian Lucaogou Formation, Junggar Basin

下载: 全尺寸图片幻灯片

图 4 四川盆地海相和准噶尔盆地湖相烃源岩藿烷单体烃碳同位素值对比

Figure 4. Comparison of single molecule carbon isotope values of hopances in source rocks from Sichuan and Junggar basins

下载: 全尺寸图片幻灯片

表 1 实验样品地球化学信息

Table 1. Basic geochemical parameters of experimental samples

序号	样品编号	地区	层位	ω(TOC)/%	S₁/(mg·g^-1)	S₂/(mg·g^-1)	T_max/℃	R_o/%
1	KSL	川西北	P₂d	6.82	1.15	46.49	448	0.65
2	J36-6	吉木萨尔凹陷	P₂l	2.21	9.25	12.05	442	0.85
3	J36-11	吉木萨尔凹陷	P₂l	1.16	6.36	5.59	433	0.90

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