储层岩石中稀有气体组分和同位素分析技术

杨华敏, 王杰, 陶成, 刘文汇

doi:10.11764/j.issn.1672-1926.2016.04.0681

天然气地球科学 >

2016 , Vol. 27 >Issue 4: 681 - 687

DOI: https://doi.org/10.11764/j.issn.1672-1926.2016.04.0681

天然气地球化学

储层岩石中稀有气体组分和同位素分析技术

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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.中国石化油气成藏重点实验室，江苏无锡 214151

杨华敏(1979-)，女，湖北荆门人，工程师，主要从事同位素地球化学测试研究. E-mail:yanghm7984@163.com.

收稿日期: 2015-07-14

修回日期: 2015-09-21

网络出版日期: 2019-09-20

基金资助

国家重点基础研究发展规划(“973”)项目(编号:2012CB214801)；中国石化股份有限公司科技部攻关项目(编号:P12009)联合资助.

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Measurement technology for content and isotopic compositions of noble gases in reservoir rocks

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1.Wuxi Institute of Petroleum Geology,Exploration and Production Research Institute,SINOPEC,Wuxi 214151,China;
2.SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms，Wuxi 214151,China

Received date: 2015-07-14

Revised date: 2015-09-21

Online published: 2019-09-20

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摘要

利用自制真空球磨脱气装置，与稀有气体纯化富集系统，四极杆质谱计及稀有气体同位素质谱计联机使用，可对储层岩石样品进行脱气、纯化富集等前处理，并完成稀有气体全组分氦、氖、氩、氪、氙的含量和各个同位素比值分析。空白实验测试了各个系统的动态真空压强、静态漏率均满足实验要求。当真空球磨脱气罐空转运行10min，本底空白值为1.0×10^-1Pa，⁴⁰Ar离子流强度在1.3×10^-10A量级，不会对样品气造成影响。测试了塔河油田奥陶系钻井岩心样品的稀有气体组分和同位素值，并与同区块天然气样品的稀有气体氦、氩数据做对比。结果表明岩石样品中稀有气体氦、氩数据与同区块的天然气氦、氩数据指标具有可比性，岩样的稀有气体数据也可应用于成藏定年，即岩样中³He/⁴He同位素特征可用来划分区域构造的相对活动性，⁴⁰Ar/³⁶Ar值是估算气源岩时代的有效指标，可用来计算成藏年代。因此当缺乏天然气样品时，一定程度上也可用储层岩石代替气样做稀有气体同位素分析。

关键词： 稀有气体组分和同位素; 分析技术; 储层岩石; 成藏定年

本文引用格式

杨华敏, 王杰, 陶成, 刘文汇 . 储层岩石中稀有气体组分和同位素分析技术[J]. 天然气地球科学, 2016 , 27(4) : 681 -687 . DOI: 10.11764/j.issn.1672-1926.2016.04.0681

Abstract

With connecting self-designed Vacuum-Ball mill device,noble gas purification and concentrating system,Quadrupole Mass Spectrometer and noble gas isotope mass spectrometer,we can extract,purify,concentrate gases from reservoir rocks.And the content and isotopic compositions of total noble gases in reservoir rocks are successfully measured.In blank test,the dynamic vacuum pressure and static rate of leak all meet the demands.When the self-designed Vacuum-Ball mill device runs for 10 mins,the background’s pressure is 1.0×10^-1Pa,the intensity of mass ⁴⁰Ar is1.3×10^-10A,sample gases are not affected.The contents and isotopic compositions of total noble gases were measured from Ordovician rocks of drilling cores in Tahe Oilfield,compared with He,Ar contents and isotopic compositions from the same area’s natural gases.The results show perfect compatibility of the contents and isotopic compositions of He,Ar between reservoir rocks and natural gases.Noble gases indicator can also be used for accumulation dating.Relative activity for regional structure is divided by ³He/⁴He in reservoir rocks,and ⁴⁰Ar/³⁶Ar is effective indicator for estimating gas-source rock time.So for the interval with absence of natural gas samples,it can be replaced by reservoir rocks accordingly.

Key words： Content and isotopic composition of noble gas; Measurement technology; Reservoir rocks; Accumulation dating

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