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用核磁共振成像技术研究了周期注水驱油机理。压力扰动弹性效应和高低渗透区之间的油水交渗效应是周期注水的主要机理，对不同地层可实施不同方式的周期注水，它对水湿地层和油湿地层都是有效的。
The mechanism of cyclic water flooding was studied by using nuclear magnetic resonance imaging technique. The pressure disturbance elastic effect and the oil-water infiltration effect between high and low permeability zones are the main mechanism of periodic water injection. Different periods of water injection can be implemented in different strata, which is effective for both wet and wet formations.