Using the Poisson sampling, the sampling process is more random, and it can show RTT variation character well.
采用泊松采样使得采样过程更加随机，更能体现RTT的变化特征。
For the tight sandstone containing gas, only velocity ratio of P wave to s wave and Poisson ratio are sensitive to fluid variation.
而对于致密含气砂岩，纵、横波速度比及泊松比对流体变化相对较为敏感。
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