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

作　　者：范文斐 侯读杰[1,2,3] 底萌卿 

机构地区：[1]中国地质大学(北京),北京100083 [2]非常规天然气地质评价与开发北京市重点实验室,北京100083 [3]页岩气资源评价与战略选区国土资源部重点实验室,北京100083

出　　处：《地质与勘探》2016年第2期346-356,共11页Geology and Exploration

基　　金：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)资助

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%。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%。本文应用全岩有机岩石学分析技术,系统研究了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,希望为该区页岩气的勘探与开发提供进一步的证据支持。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%.

关 键 词：渝东南 下古生界 富有机质页岩 生烃组分 

分 类 号：TE122.113[石油与天然气工程—油气勘探]