低渗透油藏比中高渗透油藏的压力波传播速度慢。
And low permeability reservoir is slower than mid-high permeability reservoir in pressure wave propagating velocity.
而低渗透油藏的开发要比中高渗透油藏复杂的多，开采难度也要大很多。
Low permeability reservoirs compare with high permeability reservoirs is more complex, and more difficult to development.
实验表明，低渗透油藏具有启动压力梯度，因此其渗流规律与中、高渗透油藏不同。
Experiments show that a low permeable reservoir has a starting pressure gradient, and therefore different seepage rule from that of middle and high permeable reservoirs.
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