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祁连山木里地区自2008年首次钻获到天然气水合物实物样品以来,其气源问题一直成为焦点。此次重点对神华青海能源开发有限责任公司投资项目实施的青海木里三露天天然气水合物系列钻井的岩心解析气的组成与甲烷碳及氢同位素、岩心顶空气的组成等进行了分析,结合不同钻井天然气水合物本身的气体组成和甲烷碳及氢同位素特征,进一步探讨了该区天然气水合物气源的成因与性质。结果显示:研究区内气源为混合成因,其中东部地区气源以微生物成因气为主,并混合少量热成因气;中西部地区气源以热成因气为主,其热解气具有原油裂解气特征,少部分具微生物改造气特征,同时还混合有部分微生物气及少量煤成气。
Gas source problems have been the focus of Qilian Mountain Muli since it first got physical samples of natural gas hydrate in 2008. The focus of the Shenhua Qinghai Energy Development Co., Ltd. investment project implementation of the Qinghai Muli three open-air natural gas hydrate series of drilling core analytic gas composition and methane carbon and hydrogen isotopes, core composition of the top air were analyzed, combined with different The gas composition of drilling gas hydrate itself and the characteristics of methane carbon and hydrogen isotopes further explored the origin and properties of gas hydrate sources in this area. The results show that the source of gas in the study area is mixed genesis. The gas source in the eastern part is dominated by microbial origin gas and mixed with a small amount of thermogenic gas. The gas source in the central and western regions is dominated by thermogenic gas. The pyrolysis gas has the characteristics of crude oil cracking Gas characteristics, a small part of microbial characteristics with the transformation of gas, but also mixed with some micro-gas and a small amount of coal into the gas.