大庆长垣东西两侧扶杨油层油气富集的差异性

Oil-gas accumulation difference in Fuyang oil layers between the east and the west of Daqing placanticline

为了研究大庆长垣东西两侧扶杨油层油气富集的差异性,分析油气向下"倒灌"运移条件、运移动力、运移距离和层位的差异性.结果表明,大庆长垣东部青一段源岩生成排出的油气主要向下伏扶杨油层运移,而大庆长垣西部青一段源岩生成排出的油气除了向下伏扶杨油层中运移外,还可以向上覆萨尔图、葡萄花、高台子油层中运移,即大庆长垣东部青一段源岩向下伏扶杨油层"倒灌"运移油气的条件好于西部的.嫩江组沉积末期大庆长垣东部青一段源岩的古超压值明显大于西部的,即大庆长垣东部青一段源岩生成排出的油气向下"倒灌"运移动力明显大于西部的,致使大庆长垣东部青一段源岩生成排出的油气向下"倒灌"运移距离明显大于西部的,向下"倒灌"运移层位也明显多于西部的.正是这3个条件的差异性造成大庆长垣东部扶杨油层油气的运聚条件明显优于西部的,东部油气的富集数量明显多于西部的.

To study oil-gas accumulation difference of Fuyang oil layers between the east and the west of Daqing placanticline,by the study of oil-gas migration conditions difference of K1qn1 sourcerock into Fuyang oil layers,oil-gas expelled from K1q1n sourcerock was considered to migrate mainly downward into Fuyang oil layer in the east of Daqing placanticline,oil-gas expelled from K1q1n sourcerock can not only migrate downward into F,Y oil layers in the west of Daqing placanticline oil-gas can but also migrate upward into S,P,G oil layers.It indicates that oil-gas migration conditions of K1q1n sourceinto F,Y oil layers in the east of Daqing placanticline is better than that in the west of Daqing placanticline.By the study of difference in oil-gas migration downward force,distance and horizons,ancient overpressure value of K1q1'n sourcerock in the east of Daqing placanticline was considered to be bigger than that.Oil-gas migration downward force in the east of Daqing placanticline was considered to be stronger than that in the west of Daqing placanticline in the and of K1n sedimentary period.The result caused oil-gas migration downward distance of K1q1n sourcerock in the east of Daqing placanticline to be bigger than that in the west of Daqing placanticline.Oil-gas migration downward horizons of K1q1n sourcerock in the east of Daqing placanticline was considered to be more than that in the west of Daqing placanticline.The difference of three conditions are the main cause that oil-gas migration and accumulation conditions of Fuyang oil layer in the east of Daqing placanticline is better than that in the west of Daqing placanticline.The numbers of oil layer in the east of Daqing placanticline is larger than that in the west of Daqing placanticline.