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以近两年天然气水合物资源勘查与试采工程国家专项在青海南部乌丽—开心岭冻土区开展的气源岩调查资料为基础,重点对上二叠统乌丽群那益雄组和上三叠统结扎群巴贡组烃源岩的有机地球化学指标进行分析。结果显示研究区上二叠统乌丽群那益雄组和上三叠统结扎群巴贡组烃源岩有机质含量中等,有机质类型主要为III型,且成熟度较高,大多数样品有机质达到高成熟或过成熟,处于生湿气和干气阶段,能够产生大量烃类气体来满足该区天然气水合物形成时所需的气源条件;上二叠统那益雄组泥岩和上三叠统巴贡组灰岩可成为该区天然气水合物的主要气源岩。
Based on the survey data of gas source rocks carried out by the national special project of gas hydrate resources exploration and trial production in the past 5 years in the Wuli-Kaixingling permafrost area of southern Qinghai, The organic geochemical indexes of source rocks of the Baxong Formation in the Lost Group are analyzed. The results show that the Upper Reaches of the Upper Permian Wu Li Nai Yixiong and the Upper Triassic Ligation Group Bonggong Formation source rocks are medium in organic matter, the organic matter type is mainly Type III, and the maturity is high, and most samples of organic matter reach high Mature or over mature, in the raw moisture and dry gas phase, can generate a large amount of hydrocarbon gas to meet the gas source conditions required for the formation of gas hydrates in the area; Upper Yerxiong mudstone and Upper Triassic Ba Gong group of limestone gas hydrate can become the main source rock.