Songliao Basin is a secondary lithologic trap including lithologic updip pinch out trap, diagenetic trap, tight reservoir trap and mud stone fracture trap.

• 松辽盆地次生岩性圈闭包括岩性上倾尖灭圈闭、成岩圈闭、致密储层圈闭以及泥岩裂缝圈闭等类型。