Remaining oil distribution of delta reservoirs in waterflooding oilfield is very complicated, which is resulted from the differences of petrophysical characteristics in different facies of reservoir.

注水开发油田三角洲储层剩余油分布复杂 ，其主要原因是储层间不同微相及不同部位的岩石物理特征有明显差异。

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Residual oil distribution is complicated in the thick reverse rhythm reservoir in the delta front of Shengtuo oilfield in late waterflooding stage.

注水开发后期胜坨油田三角洲前缘反韵律厚油层剩余油分布复杂。

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Waterflooding is a kind of conventional measure for improving production and recovery factor in an oilfield, but there exist some formation damages such as water sensitivity, emulsification, etc.

注水是油田提高产量及采收率的一种常规措施和采油方法，但注水也存在着地层伤害，如水敏、乳化等。

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