求翻译：本文对三岔-贺旗区长8低渗油层中油、水运动的规律进行了进一步的研究，实验观测了低渗透砂岩油层中单相液体的渗流特征，通过实验研究得到渗流曲线特征：岩样的渗流曲线均不是直线，表现出明显的非线性特征；当压力梯度较低时，随渗流流量的增加呈下凹型非线性曲线；当压力梯度较大时，渗流流量呈直线性增加；非线性段表现出明显的启动压力梯度，通过曲线拟合可知，拟启动压力梯度和最小启动压力梯度与渗透率呈幂函数负相关关系，即随渗透率增加，启动压力梯度减小。研究结果对于低渗油层的合理开发具有一定的理论和实际意义。是什么意思？

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