定边低渗油田是低孔隙低渗透油田,面临注水压力高,其他各种作业对储层伤害大等问题,严重影响油井产量。通过X衍射,扫描电镜等分析储层孔隙结构和粘土矿物含量,敏感性矿物含量高,并通过岩心伤害实验评价得出了该区块伤害程度,阐明伤害机理。实验结果表明:储层速敏伤害在中等偏弱至强,盐敏临界矿化度在40 000~2 000 mg/L。酸敏伤害在中等偏强至强酸敏,以及水锁伤害在18%~52%之间等。对此,提出了针对储层保护的建议,从而减少储层伤害,提高油田采收率。 Dingbian low permeability oilfield is a low porosity and low permeability oilfield, facing high water injection pressure, other kinds of operations on reservoir damage and other issues, seriously affecting the oil well production. The pore structure and clay mineral content of the reservoir were analyzed by X-ray diffraction and scanning electron microscopy. The content of the sensitive minerals was high. The damage degree of the block was evaluated by the core damage experiment, and the damage mechanism was elucidated. The experimental results show that the velocity-sensitive damage of the reservoir is moderately weak and strong, and the critical salinity-critical salinity ranges from 40 000 to 2 000 mg / L. Acidity sensitive to strong in the medium to strong acid sensitivity, and water lock damage between 18% to 52% and so on. In response, proposed reservoir protection recommendations to reduce reservoir damage and improve oil recovery.