Discussion of Natural Gas Mercury Content as an Identification Index of Coal Type Gas and Oil Type Gas
详细信息
- 责任者：Han Zhongxi (Langfang Branch ; Research Institute of Petroleum Exploration and Development ; Langfang 065007 ; China) ; Li Jian
- 刊名：Natural Gas Geoscience
- 出版年：2013
- 卷期：24(1)
- 关键词：天然气 ; natural gas ; 汞 ; mercury
- 页码：p.129-133
- 图表：illus., 5 tables, 22 refs.
- 分类号：1003
- issnNo：ISSN1672-1926
- isbnNo：CN62-1177/TE
摘要
Natural gas mercury content used as an important identification index of coal type gas and oil type as has been generally accepted.But in the practice,it was used not so much.The reason lies in the inaccurance illustrating of the index.Before discussing this index,it is necessary to clarify the formation mechanism of mercury in natural gas.The paper did some statistics and analysis of mercury content of coal in different coal production area of America and China,and also gas production ratio of coal with different coal rank.It was suggested that coal can supply enough mercury to form high mercury content natural gas.But lots of mercury content detection data shows that not all coal type gas has high mercury content.To illustrate this phenomenon,the paper carried out coal adsorption and thermal desorption experiment.It shows that coal can′t release but adsorb mercury at low temperature,mercury can be released enormously only at high temperature.So the source rock type and the formation temperature together determine the natural gas mercury content.More than 500 gas well′s mercury content data shows that when the natural gas has more than 30 000ng/m3 mercury content,it can be generally judged as coal type gas,when mercury content is between 10 000-30 000ng/m3,it is much possible to be coal type gas and it is easy to get an reasonable conclusion.Otherwise,the mercury content in natural gas can only be used as an auxiliary identification parameter when it varied from 5 000 to 10 000ng/m3 or even more lower.
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