| 范文斐.渝东南地区下古生界富有机质页岩有机岩石学特征[J].地质与勘探,2016,52(2):346-356 |
| 渝东南地区下古生界富有机质页岩有机岩石学特征 |
| Organic petrology characteristics of organic-rich shale of Lower Palaeozoic in southeast Chongqing |
| 投稿时间：2015-09-25 修订日期：2016-01-12 |
| DOI： |
| 中文关键词: 有机岩石学 显微组分 生烃组分 有机质热演化 富有机质页岩 渝东南 |
| 英文关键词: organic petrology, maceral composition, hydrocarbon-generating maceral, thermal evolution of organic matter, organic-rich shale, southeast Chongqing |
| 基金项目:国家自然科学基金“中国南方海相热水沉积区优质烃源岩发育特征与成因机理” （41472108）、国土资源部公益性行业科研专项“不同类型页岩气源岩地化特征精细对比研究”（201311022）联合资助 |
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| 中文摘要: |
| 渝东南下古生界主要发育牛蹄塘组和五峰-龙马溪组两套富有机质页岩：五峰-龙马溪组岩心样品显微组分总含量TMC值为0.6~1.2%，牛蹄塘组岩样TMC值为0.7~2.2%。本文应用全岩有机岩石学分析技术，系统研究了这2套页岩的显微组分组成、分布特征、主要组分对生烃的贡献以及有机质热演化程度。结果表明，页岩富氢显微组分主要为腐泥组和壳质组，其中矿物沥青基质、藻类体和壳屑体是下古生界页岩主要生烃组分，对油气生成贡献最大。渝东南下古生界富有机质页岩热演化程度处于过成熟-极高过成熟阶段，等效镜质体反射率（VRO）为2.25~5.18%。希望这些结果能为该区页岩气的勘探与开发提供进一步的证据支持。 |
| 英文摘要: |
| Lower Palaeozoic in Southeast Chongqing develops two sets of organic-rich shales——Niutitang and Wufeng-Longmaxi Formation. By means of whole-rock analysis of organic petrology,the maceral composition,distribution characteristics,contribution to hydrocarbon generating and thermal evolution of organic matter of organic-rich shale of lower palaeozoic in southeast chongqing have been studied, which could provide further evidence for the exploration and development of shale gas in the area. The total maceral contents ( TMC) of Wufeng-Longmaxi and Niutitang Formation are 0.6~1.2% and 0.7~2.2% respectively. The hydrogen-rich macerals of these shales are mainly composed of exinite and sapropelinite. It is suggested that mineral bituminous groundmass , alginite and liptodetrinite are the main hydrocarbon-generating macerals in this region,which contribute most to shale gas generation. Thermal evolution level of organic matter in these organic-rich shales are among over-mature and extremely high over-mature stage,with the equivalent vitrinite reflectance ( VRo) of 2.25~5.18%. |
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