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汞是天然气中常见的非烃气态组分,含量变化范围很大。前人研究认为,天然气中的汞含量主要受气源岩母质类型影响,煤型气汞含量相对较高,油型气汞含量相对较低,因而将其作为判识天然气类型的一种地球化学指标。但在辽河坳陷,东部凹陷部分地区和西部凹陷油型气的汞含量(14.4～1930μg/m3)明显高于东部凹陷煤型气的汞含量(25.2～52.5μg/m3),同时其天然气比我国产自稳定克拉通盆地的天然气要异常富集汞。对此进行的研究表明:天然气(尤其是油型气)中汞含量明显受盆地构造背景和深部地质过程的影响,与源岩母质类型没有明显相关性;天然气中汞含量与稀有气体3He/4He比值具有明显的正相关关系,表明天然气中一部分汞可能是来自地球深部的挥发分或与深部地质过程有关。图2表1参6(王孝陵摘)
Mercury is a non-hydrocarbon gaseous component commonly found in natural gas and varies widely in content. Previous studies suggest that the mercury content in natural gas is mainly affected by the source rock type, the mercury content in coal type gas is relatively high, and the mercury content in oil type gas is relatively low, so it is regarded as a geochemical type of natural gas type index. However, mercury content (14.4-1930μg / m3) in the Liaohe depression, parts of the eastern sag and western sag is obviously higher than that of coal gas in the eastern sag (25.2-52.5μg / m3), and its natural gas ratio Natural gas from the stable craton basin in our country should be exceptionally enriched in mercury. The results of this study indicate that the mercury content in natural gas (especially oil-gas) is obviously influenced by the tectonic setting and deep geological processes in the basin and has no obvious correlation with the parent rock types. The mercury content in natural gas is proportional to the 3He / 4He There is a clear positive correlation between the ratios, indicating that part of the mercury in natural gas may be related to the deep earth’s volatiles or to the deep geological processes. Figure 2 Table 1 Reference 6 (Wang Xiaoling Abstract)