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为了深入研究流体对岩石中弹性波速度和衰减的影响 ,必须考虑到流体的分布和粘性 .引入气体包裹体模型来研究粘性流体的分布对松散介质中P波速度和衰减的影响 ,用气泡平均半径来描述流体分布的不均匀性 ,计算了不同气泡半径和频率下P波速度和衰减随饱和度变化的曲线 ,并与有效流体模型作了比较 .由于流体喷流的存在会使Gassmann方程在高频下不适用 ,用干燥和饱流体的P波、S波速度修正了理论曲线 .测量了玻璃微珠中不同水饱和度下高频P波的速度和衰减 ,并尝试用峰值频率来计算衰减 .此方法求出的Q和频谱比法求出的Q在干燥或饱水时基本相同 ,随饱和度的变化规律也基本一致 ,但衰减峰的大小有差异 .根据实测值来拟合经修正的波速和衰减理论曲线从而估算出气泡平均半径 ,认为P波速度和衰减不仅与饱和度有关而且也与介质内部气体 液体压力平衡有关 .
In order to further study the effect of fluid on elastic wave velocity and attenuation in rock, the distribution and viscosity of fluid must be taken into account.The gas inclusion model is introduced to study the influence of viscous fluid on the P wave velocity and attenuation in loose media, Radius to describe the fluid distribution inhomogeneity, calculate the bubble radius and frequency of different bubble P wave velocity and attenuation changes with saturation curve, and compared with the effective fluid model.As the fluid jet will make the Gassmann equation in the Not applicable at high frequency, the theoretical curves were corrected with the P-wave and S-wave velocities of dry and saturated fluids.The velocity and attenuation of high frequency P-waves in glass beads with different water saturations were measured and the peak frequency was used to calculate Decay.The Q calculated by this method and the spectrum than the method of Q obtained in the dry or saturated water is basically the same with the variation of saturation are basically the same, but the size of the attenuation peaks are different.According to the measured values to be fit Corrected wave velocity and attenuation curve to estimate the average bubble radius, that the P-wave velocity and attenuation not only with the saturation but also with the media gas pressure inside the liquid level Related.