焉耆盆地侏罗纪煤系源岩显微组分组合与生油潜力

陈祥; 张育民; 程克明; 陈学宏

焉耆盆地侏罗纪煤系源岩显微组分组合与生油潜力

1.
中国石油大学资源与信息学院, 北京 102200
2.
河南油田分公司, 河南南阳 473132
3.
中国石油勘探开发研究院, 北京 100083

基金项目:

国家自然科学基金项目 40238059

详细信息

作者简介:
陈祥(1962-), 男, 教授级高级工程师, 博士研究生, 1984年毕业于华东石油学院, 主要从事石油地质综合研究工作

中图分类号: P618
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出版历程
- 收稿日期: 2005-01-17
- 刊出日期: 2005-05-25

Maceral Composition and Oil Potential of the Jurassic Coal-Bearing Series in the Yanqi Basin

1.
Faculty of Natural Resource and Information Technology, China University of Petroleum, Beijing 102200, China
2.
Henan Oil Corporation, Nanyang 473132, China
3.
Institute of Petroleum Exploration and Development, Beijing 100083, China

摘要

摘要: 焉耆盆地为我国西部含煤、含油气盆地, 侏罗系含煤地层是最重要的潜在源岩.对侏罗纪煤系中的暗色泥岩、碳质泥岩和煤层分别进行了有机岩石学、Rock-Eval热解分析和核磁共振分析.泥岩、碳质泥岩和煤层具有不同的有机岩石学和有机地球化学特征, 其中煤层具有3种有机显微组分组合类型, 不同显微组分组合类型的煤层具有不同的生油、生气潜力或倾油、倾气性.基质镜质体、角质体、孢子体等显微组分是煤中的主要生烃组分.侏罗系泥岩、碳质泥岩和煤层具有不同的生物标志物分布特征, 生物标志物组合分析表明焉耆盆地已发现原油是泥岩、碳质泥岩和煤层生成原油的混合产物.含煤地层的地球化学生烃潜力分析和已发现原油的油源对比均表明, 含煤地层不仅是重要的气源岩, 而且可成为有效的油源岩.
- 焉耆盆地 /
- 煤系 /
- 显微组分 /
- 煤成油 /
- 油源对比
Abstract: The Yanqi basin is a coal-bearing petroleum basin in northwest China. The most important potential source rock interval in this basin is the Jurassic coal-bearing series. Organic petrological analysis, Eval-Rock pyrolysis and ¹³C NMR analysis have been carried out on shale, carbonaceous shale and coal samples. Shales, carbonaceous shales and coals from the Jurassic coal-bearing series have different organic petrological and organic geochemical characteristics. There are three coal types with different maceral associations, each type having different oil/gas potential. Desmocollinite, cutinite and sporinite are the major oil-generating macerals in the coals. The Jurassic shales, carbonaceous shales and coals have different biomark- er compositions. Detailed analysis of biomarker association and oil-source rock correlation suggest that the oil found in this basin is a mixture of oil generated from Jurassic shales, carbonaceous shales and coals. This study confirms that coal-bearing series are not only important gas source rocks, but also can become effective oil source rocks.
- Yanqi basin /
- coal-bearing series /
- maceral /
- coal-generated oil /
- oil-source rock correlation

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图 1 焉耆盆地构造单元划分

Fig. 1. Structural units of the Yanqi basin

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图 2 焉耆盆地侏罗纪煤(a)和泥岩(b) 显微组成三角图

Fig. 2. Maceral composition for Jurassic coals (a) and mudstones (b) from the Yanqi basin

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图 3 焉耆盆地侏罗系煤层生烃潜力与基质镜质体B含量的关系

Fig. 3. Variation of hydrocarbon potential (S₁+S₂) with the content of vitrinite B for coals from the Yanqi basin

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表 1 焉耆盆地侏罗纪煤系烃源岩倾气倾油性评价

Table 1. Assessment of the hydrocarbon potential for coals with different maceral composition associations

表 2 焉耆盆地部分样品的¹³C NMR的组成及其与显微组成的关系

Table 2. Results of ¹³C NMR analysis for samples from the Yanqi basin

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