松辽盆地西斜坡区萨二、三油层油气成藏规律

Study on hydrocarbon accumulation for s_(2+3) reservoirs in the western slope area of Songliao Basin

为了确定松辽盆地西斜坡区萨二、三油层油气分布规律,对油气运移输导通道与油气成藏关系进行了研究。利用砂体孔隙、断裂和构造之间分布关系,对油气运移输导通道进行研究,找到了西斜坡区存在的4条主要油气运移输导通道:第1条由齐家凹陷经泰康至富拉尔基;第2条由古龙凹陷经白音诺勒至二站和阿拉新;第3条由古龙凹陷经白音诺勒至富拉尔基;第4条由古龙凹陷经巴彦查干至泰来。区内萨二、三油层组油气分布明显受油气运移通道控制:油气主要分布在4条油气运移输导通道上或附近;油气富集程度受运移输导量控制,油气输导量越大,油气富集程度越高。

The relationship between hydrocarbon migration path and accumulation is studied to understand oil and gas distribution in s2+3 reservoirs in the western slope area of Songliao Basin. Hydrocarbon migration path has been studied through the distributions of sand pores,faults and structures. 4 major migration paths are recognized in the study area. The first path is from Qijia Depression to Fulaerji via Taikang. The second is from Gulong Depression to Erzhan and Alaxin via Baiyinnuole. The third is from Gulong Depression to Fulaerji via Baiyinnuole. The fourth is from Gulong Depression to Tailai via Bayanchagan. Oil and gas distribution in s2+3 reservoirs obviously subject to migration path,mainly distributing on or near the 4 migration paths. The larger the volume of hydrocarbon migration is,the more abundant the accumulation is.