天然气地球化学

湘中坳陷涟源凹陷烃源岩油气地球化学特征

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  • 1.中国地质科学院矿产资源研究所,北京 100037;
    2.湖南有色金属控股集团矿产资源部,湖南 长沙  410015;
    3.中南大学地学院,湖南 长沙 410083;
    4.长江大学地球科学学院,湖北 荆州 434023
王明艳(1978-),男,湖北郧西人,博士后,主要从事构造、地球化学研究工作.

收稿日期: 2010-01-19

  修回日期: 2010-03-29

  网络出版日期: 2010-10-10

基金资助

高等学校博士学科点专项科研基金项目(编号:20050533019)资助.

Geochemical Characteristics and Evolution of the Hydrocarbon  Source Rocks from Lianyuan Depression in the Middle of Hunan Province

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  • 1.Institute of Mineral Resource, Chinese Academy of Geological Sciences, Beijing 100037,China;2.Department of Mineral Resources, HNG, Changsha 410015, China;3. School of Geosciences and Environmental
    Engineering, Central South University, Changsha  410083,China;4.Yangtze University, Jingzhou 434023, China

Received date: 2010-01-19

  Revised date: 2010-03-29

  Online published: 2010-10-10

摘要

湘中坳陷涟源凹陷烃源岩类型复杂,包括碳酸盐岩、泥岩和煤层。根据涟源凹陷大量露头样品的残余有机碳含量、氯仿沥青“A”、镜质体反射率和包裹体等地球化学实验数据,分析了泥盆系—二叠系烃源岩的有机质丰度、类型及热演化程度。结果表明涟源凹陷的烃源岩总体演化程度均已达到过成熟阶段,油气资源以干气为主。针对烃源岩样品的热演化程度高、丰度低的特征,在了解烃源岩地球化学特征及其与构造运动匹配关系的基础上,探讨了涟源凹陷二次生烃的可能性,最终认为涟源凹陷泥盆系—二叠系烃源岩具有中等级别的生烃能力,并在二叠系的龙潭组煤层有二次生烃的可能。

本文引用格式

王明艳, 郭建华, 旷理雄, 朱锐 . 湘中坳陷涟源凹陷烃源岩油气地球化学特征[J]. 天然气地球科学, 2010 , 21(5) : 721 -726 . DOI: 10.11764/j.issn.1672-1926.2010.05.721

Abstract

Hydrocarbon source rocks in Lianyuan depression include carbonate rock, mudstone and coal. The authors studied geochemical characteristics and maturation of organic matters in the Devonian\|Permian source rocks from Lianyuan depression based on the geochemical data of residual organic carbon content, chloroform bitumen A, vitrinite reflectance and fluid inclusions of specimens. Results suggest the source rocks of Lianyuan depression mature and generating mainly gas. The authors estimated the hydrocarbon generation intensity of the source rocks due to the high thermal evolution and little residual organic matter abundance. After analyzing the geochemical characteristics, the hydrocarbon generation intensity and the matching relationship between tectonic movement and hydrocarbon generation of the source rocks, the authors believe that the Devonian\|Permian source rocks of Lianyuan depression are of middle hydrocarbon generation potential. And the source rocks of the Permian Longtan Coal Formation have the potential to secondary hydrocarbon generation.

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