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柴达木盆地东部涩北气田是我国发现的最大生物气田,为了揭示其充注-散失过程与生物气富集规律,利用不同深度生物气组成和稳定碳同位素分馏现象,结合成藏地质模式分析,用扩散模型计算了其成藏以来的生物气散失量,并与现存储量相加得到充注量.涩北生物气田为多储盖组合叠置的背斜气田,其深部储层为气源直接充注、浅部储层接收下伏气层扩散来的生物气为间接充注.提出的某一储层相对散失量(散失量与充注量的比值)可以表征生物气富集程度,当相对散失量<0.6,有利于生物气富集并形成高效气藏,相对散失量>0.6则不利于生物气聚集、或者形成低效气藏.
Sebei gas field in eastern Qaidam basin is the largest bio-gas field discovered in China. In order to reveal its enrichment process and enrichment process, bio-gas composition and stable carbon isotope fractionation at different depths are used in combination with the analysis of reservoir geologic model , The diffusion model has been used to calculate the loss of biogas since its formation and add up to the existing reserves.The Sebei gas field is an anticline gas field superimposed by multi-reservoir cap assemblages, and the deep reservoir is the source of gas Directly charged and shallow reservoirs receive biogas diffused from the underlying gas reservoirs as an indirect charge.The proposed relative loss of a reservoir (the ratio of lost to filled) can characterize the enrichment of biogas, When the relative loss is less than 0.6, it is conducive to the enrichment of biogas and the formation of high-efficiency gas reservoirs, with the relative loss of more than 0.6, which is not conducive to the accumulation of biogas or the formation of inefficient gas reservoirs.