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烃浓度封闭是与毛细膏封闭和扭压封闭截然不同的盖层封油气机理，它虽不能对呈游离相和水溶相运移的天然气构成封盖，却可以阻滞呈分子相扩散运移的天然气，对天然气聚集与保存具有重要意义。根据地层纵向剖面中天然气在水中的浓度变化情况，提出了盖层烃浓度封闭天然气的３种模式，即无烃浓度封闭模式、部分烃浓区封闭模式和完全烃浓度封闭模式，并将其应用于松辽盆地三肇地区青山口组泥岩盖层对下伏扶余油层天然气扩散运移的浓度封闭作用的研究中，结果表明青山口组泥岩盖层在该区对扶余油层中天然气具有完全烃浓度封闭作用，凹陷中心最强，向四周减弱，充分表明了烃浓度封闭在盖层封闭天然气中的重要作用。
Hydrocarbon concentration sealing is a caprock-sealing mechanism distinct from capillary encapsulation and piezoresistive sealing. Although it can not block the natural gas that migrates in both free-phase and water-soluble phases, it can block the migration of molecular species Natural gas, natural gas accumulation and preservation of great significance. According to the variation of natural gas concentration in water in the longitudinal profile of the strata, three models of capped hydrocarbon concentration and closed natural gas are proposed, namely the closed model with no hydrocarbon concentration, the closed mode with partial hydrocarbon concentration and the closed mode with complete hydrocarbon concentration, In the study of mudstone caprock of Qingshankou Formation in Sansei area, Songliao Basin, the concentration sealing effect of natural gas in underlying Fuyu oil reservoir, the results show that the mudstone capstone of Qingshankou Formation has a complete hydrocarbon concentration in natural gas in Fuyu reservoir It has the strongest sealing center and weakened to the periphery, which fully shows the important role of hydrocarbon concentration in the closed natural gas in the caprock.