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通过大量钻井岩心观察及样品测试分析,对南祁连盆地侏罗系地层煤层聚集规律及煤层气分布特征进行研究,认为南祁连盆地侏罗系含煤地层主要为木里组和江仓组,发育辫状河、辫状河三角洲和湖泊3种沉积体系。辫状河三角洲平原泥炭沼泽是最有利的聚煤场所。随煤层厚度增大,瓦斯含量及瓦斯中CH4的含量增加,由浅至深依次分为二氧化碳-氮气带;氮气-沼气带和沼气带。哈达-柴达尔地区和江仓-聚乎更-雪霍立一线,为2个瓦斯气中心带。
Through a large number of drilling core observations and sample testing and analysis of the Jurassic strata in the South Qilian Basin, the accumulation of coal bed and CBM distribution characteristics that the South Qilian Basin, Jurassic coal-bearing formations are mainly Muli and Jiangcang Formation , Developed braided river, braided river delta and lake sedimentary system. Braided River Delta Plain The peat swamp is the most advantageous coal gathering site. With the increase of coal seam thickness, the gas content and the content of CH4 in gas increase, which are divided into carbon dioxide-nitrogen zone, nitrogen-biogas zone and biogas zone in turn from shallow to deep. Hatta-Chandal region and Gangura - polygamy - Xuehuoli line, as 2 gas gas center belt.