羌塘盆地泥火山发育区天然气水合物地球化学勘查

泥火山是天然气水合物赋存的标志之一,是天然气水合物存在的主要证据.羌塘盆地冻土区发育大量泥火山.对泥火山发育区进行了地球化学勘查,结果表明,泥火山周围具有酸解烃、荧光光谱、碳酸盐、蚀变碳酸盐、微量元素等地球化学指标显著异常,甲烷碳同位素和三维荧光结果显示地球化学烃类异常为原油伴生气和凝析油成因,表明泥火山外围烃类富集是由油气藏渗漏形成.该结论对羌塘盆地天然气水合物勘查突破具有重要意义.

Geochemical exploration of natural gas hydrate in mud volcano area of the Qiangtang Basin

Mud volcano is one of the signs of gas hydrate,and it is the main evidence for the existence of natural gas hydrate.The permafrost area in Qiangtang basin has developed a lot of mud volcanoes,the geochemical exploration of mud volcanoes shows that acidolysis hydrocarbon and fluorescence spectra,carbonate,altered carbonate and trace elements geochemical indices are abnormal in mud volcanoes,and methane carbon isotope and three-dimensional fluorescence analytical results show that hydrocarbon geochemical anomalies of crude oil are genetically related to associated gas and condensate oil formation,and that the peripheral area of mud volcano exhibits hydrocarbon enrichment,formed by the leakage of oil and gas reservoir.The results obtained by the authors are of important significance for gas hydrate exploration breakthrough in Qiangtang basin.