天然气汞含量作为煤型气与油型气判识指标的探讨

doi:10.7623/syxb201302014

石油学报 ›› 2013, Vol. 34 ›› Issue (2): 323-327.DOI: 10.7623/syxb201302014

天然气汞含量作为煤型气与油型气判识指标的探讨

韩中喜　李　剑　严启团　王淑英　葛守国　王春怡

中国石油勘探开发研究院廊坊分院河北廊坊 065007

收稿日期:2012-09-02 修回日期:2012-12-03 出版日期:2013-03-25 发布日期:2013-01-31
通讯作者: 韩中喜
作者简介:韩中喜，男，1979年2月生，2004年毕业于中国石油大学（华东），2007年获中国石油勘探开发研究院硕士学位，现为中国石油勘探开发研究院廊坊分院工程师，主要从事天然气地质与勘探及天然气气质检测与评价方面的研究。
基金资助:
国家重大科技专项“中国大型气田形成条件、富集规律及目标评价”(2011ZX05007)资助。

Discussion on the applicability of mercury content in natural gases as an identification index of coal-type gas and oil-type gas

HAN Zhongxi　 LI Jian　 YAN Qituan　 WANG Shuying　 GE Shouguo　 WANG Chunyi

Received:2012-09-02 Revised:2012-12-03 Online:2013-03-25 Published:2013-01-31

摘要/Abstract

摘要：

虽然天然气汞含量作为判识煤型气和油型气的一项重要指标已经被很多学者所接受，但在勘探实践中应用的并不多，究其原因还是对该指标的认识不够深入。为探讨该指标的适用性，笔者对天然气中汞的成因机制进行探讨。首先通过煤中汞含量、煤的产气率以及煤粉热释汞实验，分析认为天然气中的汞主要来自于气源岩，尤其是煤，只有当地层温度达到一定数值以后，气源岩中的汞才会在热力的作用下大量被释放并随生成的天然气一起运移并聚集到气藏中，气源岩类型和地层温度共同决定了天然气汞含量的高低。其次，笔者对全国8大盆地500多口天然气井开展了天然气汞含量检测，并对其中部分气井进行了天然气烷烃碳同位素检测。统计分析表明，当天然气汞含量大于30μg/m3时，可基本判断该天然气类型为煤型气;当天然气汞含量介于10～30μg/m3时，其为煤型气的几率较大，在结合其他地质资料的情况下也可比较容易得出合理的结论;但当天然气汞含量介于5～10μg/m3，甚至更低时，天然气汞含量只能作为判识煤型气和油型气的辅助参数。

关键词: 天然气, 煤型气, 油型气, 汞, 判识, 指标

Abstract:

Although the mercury content in natural gases used as an identification index of coal-type gas and oil-type gas has been accepted by many gas geochemists, it is not used so much in practical exploration. The reason is probably that the index is not clearly understood. In order to clarify the applicability of this index, firstly, we discussed the genetic mechanism of mercury in natural gases. Through examining the mercury content in coal and the gas production ratio of coal, and conducting a thermal releasing mercury experiment on crumble coal, we concluded that mercury in natural gases comes mainly from source rocks, especially coal, only the formation temperature reaches to a certain value, can mercury in source rocks begin to be released enormously by the force of heat, and migrate into a gas pool with generated gas and accumulate there. Therefore, the mercury content in gases is determined both by the source rock type and formation temperature. Secondly, we measured the mercury content of gas samples collected from more than 500 gas wells in 8 giant basins of China, and performed the carbon isotopic measurement of alkane-gas from some wells. The statistical analysis of these data showed that the gas can be generally judged as a coal-type gas when the mercury content in the gas is more than 30μg/m 3; it is more likely to be a coal-type gas when its mercury content ranges between 10～30μg/m³; and it should be pointed out that an reasonable conclusion can be drawn only by combining this measurement value with other geological data. However, the mercury content in natural gases can be used only as an auxiliary identification parameter when it varies between 5～10μg/m³ or even much lower.

Key words: natural gas, , coal-type gas, , oil-type gas, , mercury, , identification, , index

韩中喜李　剑严启团王淑英葛守国王春怡. 天然气汞含量作为煤型气与油型气判识指标的探讨[J]. 石油学报, 2013, 34(2): 323-327.

HAN Zhongxi LI Jian YAN Qituan WANG Shuying GE Shouguo WANG Chunyi. Discussion on the applicability of mercury content in natural gases as an identification index of coal-type gas and oil-type gas[J]. Editorial office of ACTA PETROLEI SINICA, 2013, 34(2): 323-327.

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天然气汞含量作为煤型气与油型气判识指标的探讨

Discussion on the applicability of mercury content in natural gases as an identification index of coal-type gas and oil-type gas

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