XC气田烃类渗漏的生态环境问题探讨

利用中子活化法对四川盆地XC气田的天然气进行分析，发现其中含有20多种金属元素。通过剖面和观察点的观察分析，发现XC气田烃类渗漏，尤其是天然气泄漏对生态环境造成了较大的负面影响：改变浅表生态环境，造成植物生长发育异常，农作牧减产；降低土壤pH值，增加金属元素的水溶态，从而增加植物对其的吸收消化；同时，植物还能从天然气中直接吸收消化一些金属元素。因此，天然气泄漏使农作物吸收消化过多的有毒有害金属，损害农产品品质，应当引起严重关注。

STUDIES ON ENVIRONMENTAL ISSUES CAUSED BY HYDROCARBON LEAK IN XC GAS FIELD

More than 20 types of metallic elements were discovered in XC gas field, Sichuan Basin, when it was studied by neutron activation analysis (NAA). After investigating into sections and observation-point of XC gas field, discoveries were made that hydrocarbon leaks, especially natural gas leak in XC gas field, had a severe impact on ecologic environment. It has changed the ecologic environment moderately, caused heteroplasia of plants, and also reduced the production of farming and agriculture. Meanwhile, soil PH was reduced and water-soluble metallic elements were added to soil. Therefore, plants will absorb more metallic elements from soil. Besides, plant can also take in some metallic elements directly from natural gas. Thus, over-absorptions of toxic and harmful metallic element by plants could ruin the quality of plants, which should be highly concerned.