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随着人类对天然气需求的不断增加,煤层气作为一种新兴的能源受到人们越来越多的重视,但天然气中普遍含汞的性质决定了我们有必要对其加强研究。按照天然气中汞的成因假说,沁水盆地南部地区煤层气汞含量可能较高。为了验证这一问题,采用德国Mercury Instruments公司生产的痕量汞检测仪UT3000对该地区7口煤层气井和1处煤层气液化站进行检测。检测结果显示该地区煤层气汞含量普遍很低,均在10ng/m3以下,因此在煤层气勘探与生产过程中不存在汞的威胁。为了解释这一现象,开展了煤粉热吸汞、释汞实验。实验数据表明当加热温度大于120℃时煤粉释汞,而在小于100℃时煤粉吸汞,吸汞与释汞的温度平衡点介于100～120℃之间。沁水盆地南部地区煤层埋藏较浅,地层温度一般不会超过56℃,在此地层温度下,煤系有机质对汞具有强烈吸附作用,这是导致该地区煤层气含汞很低的根本原因。
With the increasing demand for natural gas from mankind, more and more attention has been paid to CBM as an emerging energy source. However, the universal nature of mercury in natural gas determines that it is necessary for us to strengthen its research. According to the Hyprochemical hypothesis of natural gas, mercury content in coalbed methane may be high in southern Qinshui Basin. To test this issue, seven Mercury gas wells and one CBM liquefaction plant in the area were tested using the trace mercury detector UT3000 manufactured by Mercury Instruments in Germany. The test results show that the mercury content of CBM in the area is generally very low, both below 10ng / m3, so there is no threat of mercury in CBM exploration and production processes. In order to explain this phenomenon, carried out a pulverized coal heat mercury, mercury release experiments. The experimental data show that when the heating temperature is higher than 120 ℃, the coal releases mercury, while when the temperature is less than 100 ℃, the temperature equilibrium point between mercury and mercury release is between 100 and 120 ℃. The coal seams in southern Qinshui Basin are shallow buried, and the formation temperature generally does not exceed 56 ℃. Coal-derived organic matter has a strong adsorption effect on mercury at this formation temperature, which is the fundamental reason for the low mercury content in coalbed methane in this area.