Mercury Concentration in Coalbed Methane in South of Qinshui Basin
Received date: 2009-09-11
Revised date: 2010-01-05
Online published: 2010-12-10
With increasing demand of natural gas in our country,coalbed methane as a kind of new energy sources is becoming more and more important.But it should be paid accention on mercury concentration in of natural gas.According to hypothesis of mercury origin in natural gas,mercury concentration in coalbed methane in the south of Qinshui basin would be high.To test it,we use the ultra mercury detector of UT 3000 made in Germany Mercury Instruments to detect mercury concentration in 7 coalbed methane wells and a LNG plant.The result showed that there was very low concentration of mercury in coalbed methane,less than 10ng/m3.So,it is safety for exploiting and developing coalbed methane.We did the experiment of coal flour thermally absorbed and released mercury to explain this phenomenon.The result showed that coal flour absorbed mercury when heating temperature is below 100℃; in contrast the coal flour released mercury when the temperature is more than 120℃.So the balance of absorbing and releasing mercury for cola flour is among 100℃ and 120℃.In the south of Qinshui basin,the burial depth of coal bed is relatively shallow,and the geo-temperature is generally less than 56℃.In the condition of low get-temperature,mercury was strongly absorbed by organic matter in coal measure,resulting in the low mercury concentration in coalbed methane.
Key words： Coalbed methane; Mercury; Qinshui basin; Geo-temperature
HAN Zhong-Xi, YAN Qi-Tuan, LI Jian, GE Shou-Guo, GOU Yan-Xia . Mercury Concentration in Coalbed Methane in South of Qinshui Basin[J]. Natural Gas Geoscience, 2010 , 21(6) : 1054 -1056,1060 . DOI: 10.11764/j.issn.1672-1926.2010.06.1054
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