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。
Moreover, investigated the relation among the P wave velocity, the micro-crack in rock with the variation of core diameter.
探讨了岩石的微观裂隙、超声波速度与岩芯变形之间的关系。
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