The main reservoir spaces in Archean are mainly tensional, steeply dipped fractures oriented in NE and NW directions and micro-cracks formed in the middle or the Late Mesozoic.

• 茨榆坨潜山储集空间主要是裂缝和微裂隙，太古界储层主要发育北东向和北西向两组裂缝，以高角度张性裂缝为主，形成于中生代中、晚期；