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在深入分析松辽盆地北部各断陷天然气成藏条件的基础上 ,指出各断陷在烃源岩发育、有机质演化程度和盖层条件上存在明显的差异。莺山—庙台子、徐家围子、常家围子—古龙和林甸断陷烃源岩相对发育 ,有机质演化程度高 ,有利于寻找干气 ;绥化断陷有机质正进入成熟阶段 ,应以寻找湿气为主 ;北安、依安断陷和拜泉断陷群有机质演化程度低 ,应以寻找生物气为主。莺山—庙台子、常家围子—古龙、徐家围子和林甸断陷天然气保存条件相对较好 ,有利于天然气的富集成藏。
Based on the in-depth analysis of gas accumulation conditions in various fault-sags in the northern Songliao Basin, it is pointed out that there are obvious differences in the development of source rocks, the evolution of organic matter and the conditions of caprock in each fault. The source rocks of Yingshan-Miaomuzi, Xujiaweizi, Changjiaweizi-Gulong and Lindian rifts are relatively developed with high degree of evolution of organic matter, which is good for finding dry gas. The organic matter in Suihua fault is entering the mature stage and should be looking for wet Gas. The evolution of organic matter in Bei’an, Yi’an fault depression and Baiquan faulted group is low, so it is necessary to look for biogas mainly. The Yingshan-Miaotai, Changjiaweizi-Gulong, Xujiaweizi and Lindian rifts show relatively good conservation conditions for natural gas, which is favorable for the enrichment and accumulation of natural gas.