松辽盆地火山岩储层天然气藏He同位素组成累积效应

杨春，陶士振，侯连华，米敬奎，杨帆

doi:10.11764/j.issn.1672-1926.2014.01.109

天然气地球科学 >

2014 , Vol. 25 >Issue 1: 109 - 115

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.01.109

天然气地球化学

松辽盆地火山岩储层天然气藏He同位素组成累积效应

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中国石油勘探开发研究院，北京 100083

杨春（1981-），男，甘肃陇西人，工程师,博士，主要从事天然气地质及地球化学研究. E-mail:yangchunzs@petrochina.com.cn.

收稿日期: 2013-09-18

修回日期: 2013-12-18

网络出版日期: 2014-01-10

基金资助

国家科技重大专项（编号:2011ZX05001-003）资助．

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Accumulative Effect of Helium Isotope in Gas Volcanic Reservoirs in Songliao Basin

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PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China

Received date: 2013-09-18

Revised date: 2013-12-18

Online published: 2014-01-10

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摘要

地质演化过程中，天然气藏储层中放射性元素衰变产生的³He和⁴He会在气藏中逐渐积累，使气藏中He同位素组成³He/⁴He）产生变化。以松辽盆地徐家围子断陷和长岭断陷深层火山岩储层天然气藏为研究对象，对火山岩储层天然气和储层流体包裹体中的He同位素进行研究。当火山岩储层无Li元素含量异常时，放射成因³He产率很低，基本可以忽略，放射性元素衰变产生的³He不会影响CH₄/³He值和CO₂/³He值2项地球化学指标。当火山岩储层中放射性元素丰度高于沉积岩层中时，在地质历史中会产生更多的⁴He，对气藏中He同位素的影响较大。营城组火山岩每克岩石每年生成⁴He约为5.1×10^-12cm³。在不考虑扩散的情况下，Xs1-1井营城组火山岩初始的³He/⁴He值为3.51×10^-6，即R/R_a值为2.51，现今R/R_a值为1.1，当R/R_a值减小到初始值的43.8%时，幔源He的比例相应从原来29.9%减少到目前的10.75%，即幔源He的比例减小到原始的1/3。

关键词： He同位素; 放射成因He; 累积效应; 火山岩; 松辽盆地

本文引用格式

杨春，陶士振，侯连华，米敬奎，杨帆 . 松辽盆地火山岩储层天然气藏He同位素组成累积效应[J]. 天然气地球科学, 2014 , 25(1) : 109 -115 . DOI: 10.11764/j.issn.1672-1926.2014.01.109

Abstract

In natural gas reservoir,³He and ⁴He are produced and accumulated by radioactive elements decay and resulted in the changing of ³He/⁴Heduring geological time.In this paper,we discuss the volcanic gas reservoirs in the Xujiaweizi and Changling fault depressions of Songliao Basin because the high ratio of helium isotope in the gas reservoirs.It is negligible for ³He produced at a very low level due to no Li concentration abnormity in this area.So,the elements decay does not affect the two ratios of CH₄/³HeandCO₂/³He.The volcanic rocks contain more radioactive elements than that of sedimentary rocks,and the former will produce more 4He to influence the Helium isotope in gas reservoirs.In volcanic rock reservoirs of the Xujiaweizi and Chagnling fault depressions,1g volcanic rock in the Yingcheng Formation can produce 5.1×10^-12cm³ ,⁴He per day.In the volcanic rocks of Yingcheng Formation at Xujiaweizi,primary ratio of ³He/⁴Hewas 3.51×10^-6,and the corresponding R/Ra was 2.51.But it is 1.10 at present.R/Ra diminished to 43.8% of the primary value and the proportion of mantle helium reduced from 29.9% to 10.95%,which is to say that the mantle gas decreased to 1/3 of the primary one.

Key words： Helium isotope; Radiogenic helium; Accumulative effect; Volcanic rocks; Songliao Basin

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