延安探区山西组页岩气包裹体激光拉曼光谱组分及成藏期次  

Laser Raman component of the inclusion and accumulation period time of shale gas in the Shanxi Formation in the Yan'an exploration area

作　　者：焦渊博 李艳霞 常悦[1] JIAO Yuan-bo;LI Yan-xia;CHANG Yue(School of Earth Sciences and Engineering,Xi'an Shiyou University,Xi'an 710065,China;Key Laboratory of Dense Oil and Gas Geological of National Petroleum and Petrochemical Industry,Key Laboratory of Shaanxi Province Accumulation Geology,Xi'an Shiyou University,Xi'an 710065,China)

机构地区：[1]西安石油大学地球科学与工程学院,西安710065 [2]西安石油大学全国石油和化工行业致密油气地质重点实验室,陕西省油气成藏地质学重点实验室,西安710065

出　　处：《兰州大学学报（自然科学版）》2023年第2期151-156,165,共7页Journal of Lanzhou University(Natural Sciences)

基　　金：国家科技重大专项(2017ZX05039001-03)。

摘　　要：为研究鄂尔多斯盆地延安探区山西组页岩气藏的成藏期,通过对泥页岩夹层中的包裹体镜下形态观察、冷热台测温及对单包体组分激光拉曼光谱测试,研究包裹体的形态、分类、组分及均一温度等特征,借助于盆地模拟软件,使用均一温度和埋藏史热史模拟结合的方法研究页岩气成藏期次.结果表明,山西组页岩气包裹体类型主要为盐水包裹体和含烃盐水包裹体,激光拉曼光谱主要为饱和烃型拉曼光谱图、烷烃+沥青型拉曼光谱图、荧光型拉曼光谱图3种类型,说明当包裹体被捕获时,地层流体成分中含饱和烃和芳烃.包裹体有两个形成时期,结合沉积埋藏史,研究区天然气存在两期充注,第1期充注时间在208~180Ma,为早侏罗世,是煤系烃源岩的Ⅲ型干酪根早期生成的少量液态烃+气态烃;第2期充注时间在178~125Ma,为中侏罗世-早白垩世中期.In order to study the shale gas accumulation period of the Shanxi Formation in the Yan'an exploration area,Ordos Basin,methods of polarizing and fluorescence microscope,heating/freezing system and single fluid inclusion Raman spectrum analysis were used to research into the characteristics of the form,classification,composition and temperature measurement of the fluid inclusion in the shale.With the aid of the basin simulation software,the shale gas accumulation periods were studied through the method of homogenizing temperature and burial thermal history simulation.The results showed that the fluid inclusion in the Shanxi Formation was mostly of the aqueous inclusion and hydrocarbon-aqueous inclusion and the laser Raman spectrograms were of three main types:saturated hydrocarbon type Raman spectrum,alkane+asphalt type Raman spectrum and fluorescence type Raman spectrum.This result suggested that the composition of the formation fluid had saturated hydrocarbon and aromatic hydrocarbons when the fluid inclusion was captured.Fluid inclusion had two accumulation periods,and,in combination with the history of depositional burial,it was judged that the gas in research area had two filling periods.The first injection stage was 208-180 Ma in about Early Jurassic,when a small amount of liquid hydrocarbon+gaseous hydrocarbon was generated in the early stage of type II kerogen of coal-measure source rocks,and the second injection stage was 178-125 Ma,in about Middle Jurassic tomiddle Early Cretaceous.

关 键 词：页岩气 激光拉曼光谱 包裹体成分 成藏期次 

分 类 号：TE122[石油与天然气工程—油气勘探]