青海木里三露天天然气水合物土壤热释烃技术应用研究

吸附烃(酸解烃和热释烃)技术在常规油气地球化学勘查中已显示出良好的应用效果。选择青海木里三露天进行土壤热释烃地球化学方法试验，通过对土壤样品热释烃特征值和地球化学异常分布特征的分析，显示研究区已知矿藏区上方存在良好的土壤热释烃地球化学环状异常，异常的空间展布受到地下矿藏的控制，二者具有良好的对应关系 。通过对研究区烃类甲烷碳同位素分析，指示土壤热释烃地球化学异常为热解成因，与天然气水合物具有相似的成因类型。试验结果表明，土壤热释烃技术适用于天然气水合物地球化学勘查，能够圈出水合物矿藏范围，可与其他水合物化探技术互相补充。

Application of the Pyrolysis-Desorbed Hydrocarbon Technology to the Geochemical Exploration of Gas Hydrate in the Sanlutian Area in Muli Permafrost,Qinghai

Absorbed hydrocarbon (acidolysis hydrocarbon and pyrolysis-desorbed hydrocarbon) technique has displayed favorable affection in normal oil and gas geochemical exploration. In this paper, based on the soil absorbed hydrocarbon test conducted in Muli area in Qinghai, the analysis of the characteristic value and the distribution features of the geochemical anomaly reveals that hydrocarbon annular anomalies is consistent with the detected mineral area, the spatial distribution of which is controlled by underground resources. According to the analysis of the methane carbon isotope, the origin of soil absorbed hydrocarbon anomaly is proved to be pyrolysis, which has the similar thermogenic characteristics with gas hydrate. The experimental results indicate that the soil heat-release hydrocarbon technology applicable to the geochemical exploration of gas hydrate can delineate the hydrate deposits region, which could be the supplement of other geochemical exploration methods.