通过在四川盆地西部新场气田开展油气化探试验,发现热释汞指标应用过程中未被人们注意的一个问题。试验表明土壤热释汞与汞元素全量存在较好的相关性,二者各自对油气田的响应特征却不明显,通过对热释汞的成因分析,认为其受近地表土壤汞元素全量的影响,因此,利用热释汞指标进行油气化探时,应当考虑近地表土壤汞元素的全量对其的干扰,利用比值指标较好地削弱了噪声,提取了与油气微渗漏有关的汞异常,在油气田边缘呈晕状分布。研究为今后该指标的有效应用提供了有价值的地球化学信息。 Through the geochemical exploration test of Xinchang gas field in the west of Sichuan Basin, we found a problem that has not been noticed in the application of the index of mercury release. The results showed that there was a good correlation between pyro-mercury and elemental mercury in soil, but their response characteristics to oil and gas fields were not obvious. According to the genesis analysis of pyro-mercury, Therefore, the use of pyrogenetic mercury indicators for oil and gas geochemical exploration, should consider the near-surface soil mercury total amount of its interference, the use of ratio indicators to better weaken the noise, extracted oil and gas microleakage-related mercury anomalies, in Oil and gas fields edge was halo-like distribution. The research provides valuable geochemical information for the effective application of this indicator in the future.