烃源岩中可溶有机质的FTIR地球化学意义探讨——以准噶尔盆地下二叠统风城组为例

何沐飞; 张景坤; 米巨磊; 陈俊; 胡凯; 曹剑

doi:10.11781/sysydz2021061048

烃源岩中可溶有机质的FTIR地球化学意义探讨——以准噶尔盆地下二叠统风城组为例

doi: 10.11781/sysydz2021061048

何沐飞^1,,
张景坤¹,
米巨磊²,
陈俊²,
胡凯¹,
曹剑^1, ,

1.
南京大学地球科学与工程学院, 南京 210023
2.
中国石油新疆油田分公司实验检测研究院, 新疆克拉玛依 834000

基金项目:

国家自然科学基金青年基金 42102148

中国博士后科学基金 2021M691497

江苏省博士后科研资助计划 2021K216B

详细信息

作者简介:
何沐飞(1996-), 男, 硕士, 主要从事油气地球化学研究。E-mail: 292079838@qq.com

通讯作者:
曹剑(1978-), 男, 博士, 教授, 主要从事石油地质学与有机地球化学研究。E-mail: jcao@nju.edu.cn

中图分类号: TE135
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出版历程
- 收稿日期: 2021-04-27
- 修回日期: 2021-08-26
- 刊出日期: 2021-11-28

Organic geochemical study of FTIR analysis on source rock extracts: a case study of Lower Permian Fengcheng Formation in Junggar Basin, NW China

HE Mufei^1
,,
ZHANG Jingkun¹,
MI Julei²,
CHEN Jun²,
HU Kai¹,
CAO Jian^{1
, ,}

1.
School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, China
2.
Research Institute of Experiment and Testing, PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China

摘要

摘要: 为进一步拓展显微傅里叶红外光谱（FTIR）技术在有机地球化学研究中的应用，以准噶尔盆地下二叠统风城组碱湖相含油气系统为例，开展了沉积有机质的生烃研究。结果表明，7组红外官能团具有指征意义，并据此提出3个红外结构新参数，即A指数（A_{2 920}/A_{3 600}）、B指数（A_{2 920}/A_{1 460}）和C指数（A_{1 140}/A_{1 600}）。A指数揭示盐岩区烃源岩具有更高的生烃潜力，B指数揭示可能存在热液流体影响导致盐岩区有机质具有异常的热演化，而C指数表明从边缘区到盐岩区，随盐度的升高，有机质的分子聚合受到影响。据此，位于沉积中心的盐岩区油气勘探潜力较大，尽管在深层可能仍存在轻质原油。这些认识为区域油气勘探提供了新的参考资料，展示了FTIR技术能为传统的有机地球化学研究提供补充，具有广阔的应用潜力。
- 显微傅里叶红外光谱(FTIR) /
- 沉积有机质 /
- 生烃潜力 /
- 碱湖 /
- 风城组 /
- 准噶尔盆地
Abstract: To discover the values of Fourier Transform Infrared Spectroscopy (FTIR) in the research of organic geochemistry, hydrocarbon generation features of source rocks of Lower Permian Fengcheng, Junggar Basin were studied by the means of FTIR analysis on the extracts. Seven FTIR functional groups appeared to have indicative significance, based on which three new index were proposed, including A index (A_{2 920}/A_{3 600}), B index (A_{2 920}/A_{1 460}), and C index (A_{1 140}/A_{1 600}). Specifically, A index unraveled a higher hydrocarbon generation potential of the source rocks located in saline areas, B index indicated that the possible hydrothermal fluid injection have caused the abnormal thermal evolution of organic matter in saline source rocks, and C index showed that an increasing salinity from marginal zone to saline zones has affected to the organic molecular polymerization in the Fengcheng Formation source rocks. Based on that, the saline zone located at the center of Fengcheng Formation deposition has great potential for oil-gas exploration, particularly for light oils in the deep reservoirs. These understandings provided new references for the regional oil-gas exploration and pointed out that FTIR can supplement traditional organic geochemistry, displaying a broad application potential.
- Fourier Transform Infrared Spectroscopy (FTIR) /
- sedimentary organic matter /
- hydrocarbon generation potential /
- alkaline lacustrine /
- Fengcheng Formation /
- Junggar Basin

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图 1 准噶尔盆地玛湖凹陷构造框架、风城组烃源岩样品采集位置(a)及研究区地层柱状图(b)

Figure 1. Tectonic map of Mahu Sag in Junggar Basin and sampling location of Fengcheng Formation source rocks (a) and stratigraphic section of study area (b)

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图 2 准噶尔盆地玛湖凹陷风城组烃源岩3 800~2 800 cm^-1红外光谱

Figure 2. FTIR spectra with wavenumber of 3 800-2 800 cm^-1 of Fengcheng Formation source rocks collected from Mahu Sag, Junggar Basin

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图 3 准噶尔盆地玛湖凹陷风城组烃源岩生烃潜力A指数变化趋势

Figure 3. Distribution of hydrocarbon-generation potential A-index of Fengcheng Formation source rocks collected from Mahu Sag, Junggar Basin

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图 4 准噶尔盆地玛湖凹陷风城组烃源岩B指数随深度的变化趋势

Figure 4. Distribution of hydrocarbon-generation potential B-index of Fengcheng Formation source rocks collected from Mahu Sag, Junggar Basin

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图 5 准噶尔盆地玛湖凹陷风城组烃源岩C指数随B指数变化关系

Figure 5. C-index vs. B-index of Fengcheng Formation source rocks collected from Mahu Sag, Junggar Basin

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图 6 准噶尔盆地玛湖凹陷风城组烃源岩850~700 cm^-1芳香环官能团结构

Figure 6. Aromatic funational structural FTIR spectra with wavenumber of 850-700 cm^-1 of Fengcheng Formation source rocks collected from Mahu Sag, Junggar Basin

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表 1 准噶尔盆地玛湖凹陷风城组烃源岩样品信息及地球化学数据

Table 1. Sample information and basic geochemical data of source rocks collected from Fengcheng Formation, Mahu Sag, Junggar Basin

井号	碱湖沉积环境	深度/m	岩性	ω(TOC)/%	C₂₉ααα20S/(S+R)甾烷	γ/C₃₀藿烷
风南5	中心区	4 066	深灰色含苏打石泥岩	0.9	0.5	0.7
风南7		4 595	灰色荧光泥质白云岩	1.1	0.5	0.5
艾克1		4 120	深灰色泥岩	0.9	0.6	0.6
风20		4 322	灰色泥质白云岩	1.0	0.5	0.6
风南3		4 545	黑色泥岩	1.1	0.6	0.6
风城1		4 194	深灰色白云岩	1.0	0.5	0.7
风南1	过渡区	4 096	深灰色泥岩	1.4	0.5	0.4
风南8		3 595	深灰色泥岩	1.2	0.5	0.3
风5		3 250	深灰色白云岩	1.0	0.5	0.4
风南14		4 127	灰色白云岩	1.3	0.4	0.3
风7		3 560	灰色白云岩	1.0	0.5	0.4
夏72		3 801	凝灰质泥岩	1.3	0.5	0.3
风23		4 044	深灰色泥质白云岩	1.4	0.5	0.5
夏76	边缘区	3 455	凝灰质泥岩	2.7	0.5	0.2
夏40		3 581	深灰色泥岩	2.0	0.4	0.2
百泉1		3 489	灰色白云质泥岩	1.4	0.5	0.2
夏88		3 365	灰色白云质泥岩	2.3	0.5	0.2
注：由于总有机碳(TOC)及色谱—质谱(GC-MS)分析是常规实验，实验方法未列出；γ代表伽马蜡烷。

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表 2 准噶尔盆地玛湖凹陷风城组烃源岩样品FTIR结构参数

Table 2. FTIR structural parameters of Fengcheng Formation source rocks collected from Mahu Sag, Junggar Basin

井号	碱湖沉积环境	深度/m	FTIR结构参数
井号	碱湖沉积环境	深度/m	A指数	B指数	C指数
风南5	中心区	4 066	1.5	0.6	2.2
风南7		4 595	1.7	0.5	2.4
艾克1		4 120	1.6	0.6	2.3
风20		4 162	1.7	0.5	2.4
风南3		4 545	1.7	0.6	2.3
风城1		4 194	1.7	0.6	2.4
风南1	过渡区	4 096	0.6	0.3	2.0
风南8		3 595	0.6	0.4	2.2
风5		3 250	0.7	0.3	1.3
风南14		4 127	0.8	0.3	1.6
风7		3 560	0.7	0.4	2.0
夏72		3 801	0.6	0.3	1.4
风23		4 044	0.7	0.3	2.0
夏76	边缘区	3 455	0.5	0.2	0.8
夏40		3 581	0.6	0.2	1.0
百泉1		3 489	0.6	0.2	0.9
夏88		3 365	0.6	0.3	0.8
注：A指数=C-H(2 920 cm^-1)/O-H(3 600 cm^-1)；B指数=C-H(2 920 cm^-1)/C-H(1 460 cm^-1)；C指数==C-H(1 140 cm^-1)/C=C(1 600 cm^-1)。

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