松辽盆地北部天然气成藏与分布的主控因素

Main controlling factors of natural gas reservoirforming and distribution in the north part of Songliao basin.

在总结松辽盆地北部天然气成藏条件与分布特征的基础上 ,提出了该盆地北部天然气成藏与分布的两个主控因素———气源岩与盖层时空配置关系和断层。气源岩与盖层空间配置关系控制天然气成藏的分布范围 ,其时间配置关系控制天然气的富集程度。断层作为运移通道 ,连接气源岩和圈闭 ,在空间上的延伸层位控制天然气垂向运聚层位 ,其活动时期控制天然气垂向运聚时期 。

Based on summarizing the natural gas reservoirforming conditions and distribution characteristics in the north part of Songliao basin, this paper put forward two main factors (the timespace matching relation between sourcerock and caprock, and fault) controlling the natural gas reservoirforming and distribution. The space matching relation between sourcerock and caprock controls the distribution scope of gas reservoir, and its time matching relation controls the accumulation degree of gas reservoir. The fault as a migration passage connects sourcerock and traps. The extend horizon of faults controls the vertical horizon of gas migration and accumulation, its active period controls period of gas vertical migration and accumulation. Fault as a barrier controls trap formation.