Reservoir rock of Jurassic and lower Cretaceous in Beishan Basin group is mainly feldspathic litharenite and lithic arkose,Secondly is lithic sandstone,Both mineral and textural maturity are poor.

• 北山盆地群侏罗系和下白垩统砂岩储层主要属长石岩屑砂岩和岩屑长石砂岩，其次为岩屑砂岩，成分和结构成熟度均较低；