松辽盆地北部深层封盖条件及对天然气成藏的控制作用

Deep Sealing Condition of the North of Songliao Basin and It's Influence on Forming Natural Gas Pool

作者在全面分析松辽盆地北部深层封盖条件的基础上 ,认为深层盖层时空分布不利于天然气成藏 ,不连续分布特征决定了天然气只能局部分布 ,登二段泥岩盖层同源岩排烃匹配关系好于泉一、二段 ,错综复杂的断层虽能促进多种圈闭类型的形成 ,但长期断层多期活动会将天然气更多地向中浅层输导 。

On the basis of overall analysis in the deep sealing condition of the north of Songliao Basin,it was thought that the space time distribution of deep caprock is the disadvantage of the gas pool forming.The feature of discontinuous distribution determines that the gas can only accumulate and pools form in small areas.The disposing relation between K 1d 2 caprock and the period of source rock discharge of K 1d 2 is better than that of K 1q 1+2 Although the complicated faults can form a variety of traps,the long period and many time movement faults can also transport the gas into the mid shallow layer,which was the disadvantage of the conservotion of gas pools.