羌塘盆地白垩系黑色岩系生烃母质研究

承秋泉; 杨若飞; 胡广; 付修根; 曹剑

doi:10.11781/sysydz201601091

羌塘盆地白垩系黑色岩系生烃母质研究

doi: 10.11781/sysydz201601091

1.
中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214151
2. 南京大学地球科学与工程学院, 南京 210023
3. 西南石油大学地球科学与技术学院, 成都 610500
4. 中国地质调查局成都地质矿产研究所, 成都 610081

基金项目: 国家自然科学基金(41322017,41472100,41472099)资助。

详细信息

作者简介:
承秋泉(1964-),男,高级实验师,从事油气地球化学实验研究和管理工作。E-mail:andrew2005@126.com。

中图分类号: TE122.1⁺1
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出版历程
- 收稿日期: 2015-03-18
- 修回日期: 2015-12-08
- 刊出日期: 2016-01-28

Bio-precursors of Cretaceous black shales in the Qiangtang Basin, Tibet

1.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214151, China
2. School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, China
3. School of Earth Sciences and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China
4. Chengdu Institute of Geology and Mineral Resources, China Geological Survey, Chengdu, Sichuan 610081, China

摘要

摘要: 羌塘盆地白垩系是该区域新近发现的潜在烃源层系,通过有机岩石学和地球化学相结合的方法研究了其生烃母质。结果表明,根据观测到的各类生烃母质形状、大小、聚集形式以及荧光等特征综合分析,其成烃生物组合由高到低主要包括底栖生物、细菌、浮游藻类和高等植物4大类,并以底栖藻类占主要地位。这种以底栖藻类为主的烃源岩系与国内外其他同类烃源岩特征类似,在地球化学特征上表现为有机质丰度高(TOC大于2.0%,达到好烃源岩质量标准)、有机质类型较差(Ⅱ₂型),据此认为这套黑色岩系形成于海相环境。结合其在区域上的热演化特征,认为其具有良好的生烃潜力,特别是生气潜力,值得在今后的油气勘探和地质研究中加以重视。
- 生烃母质 /
- 黑色岩系 /
- 底栖生物 /
- 烃源岩 /
- 白垩系 /
- 羌塘盆地 /
- 特提斯
Abstract: A new sequence of hydrocarbon source rock has been discovered recently in the Qiangtang Basin, Tibet, i.e., the Cretaceous black shales. We investigated the bio-precursors of the shales by an integrated method of organic petrology and geochemistry to improve the understanding of their resource potential. Results showed that the bio-precursors of the shales can be classified into four types in general based on their shapes, sizes, accumulation forms and fluorescence. They include marine benthic algae and zooplankton, bacteria, phytoplankton and terrestrial higher plants in decreasing order of abundance. Benthic algae are the dominant precursors. Similar to source rocks of the same type worldwide, these benthic algae dominant source rocks have high organic matter abundance (TOC>2.0%), reaching the level of good quality and belonging to organic matter type Ⅱ₂, indicating that they were deposited in a marine environment. Combined with the regional thermal evolution of the shales, we deduced that the black shales have a good hydrocarbon resource potential and are likely to produce dominantly gas. They may comprise a good exploration target and merit further geological research.
- bio-precursor /
- black shales /
- benthic organism /
- source rock /
- Cretaceous /
- Qiangtang Basin /
- Tethys

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