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为能够利用声波测井资料对岩石的力学参数进行反演,选取代表性埋深砂岩,对单三轴压缩过程中的应力-纵波波速之间的变化规律进行了研究,对不同围压下,压缩过程中的波速变化规律进行了比较。结果表明,在轴向压缩过程中,砂岩纵波波速显著增加,砂岩单轴抗压强度与纵波波速之间存在一定关系。砂岩压缩过程中,在低围压下波速变化相对明显;高围压下波速变化相对较小,在偏应力较小时,波速与应力基本为线性关系,当偏应力达到一定数值时,波速稳定在某一定值,即曲线出现水平渐近线。
In order to be able to invert the mechanical parameters of rock using acoustic logging data and select the representative buried sandstone, the variation law of stress-longitudinal wave velocity in single triaxial compression was studied. Under different confining pressures, Compression process of the wave velocity changes were compared. The results show that during the axial compression, the longitudinal wave velocity of sandstone significantly increases, and the uniaxial compressive strength of sandstone has a certain relationship with the longitudinal wave velocity. In the sandstone compression process, the change of wave velocity is relatively obvious under low confining pressure. The change of wave velocity under high confining pressure is relatively small. When the deviatoric stress is small, the wave velocity and stress are basically linear. When the deviatoric stress reaches a certain value, the wave velocity is stable at A certain value, that is, the curve appears asymptotic horizontal line.