The oil reservoirs in Pingbei Area of Ansai Oilfield is difficult to develop because of its ultra-low permeability, micro-fracture, and low production of oil wells.

• 摘要安塞油田坪北区油层渗透率特低，具有微裂缝，油井产量低等特点，为此，增加了油藏开发中的难度；