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。
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The fracture in studied area can he divided into diagenetic micro-facture, weathering fracture and structural fracture.