为了定量确定裂缝宽度、倾角、延伸长度及填充物等不同因素对斯通利波幅度衰减的影响,将原先岩心样品固定、中部钻孔移动探头的激波管斯通利波测量方法,改进为岩心样品不钻孔垂直升降、沿激波管管壁固定分置多探头的测量方法进行实验分析。通过对斯通利波信号进行时间校正和幅度校正,有效改善了斯通利波首波信噪比,提高了测量精度。同时,利用全直径碳酸盐岩岩心,针对此测量方法加工了21组裂缝参数相异（裂缝宽度为毫米级）的岩心模型,并定义相对幅度表征斯通利波衰减。实验结果表明,斯通利波相对幅度随裂缝宽度增加呈指数衰减、随裂缝倾角增加线性降低、随裂缝深度增大呈指数衰减、随填充物渗透率增加而降低。在上述4种情况中,裂缝宽度对斯通利波幅度衰减的影响最大,其次是裂缝延伸长度和填充物渗透率,最后是裂缝倾角。图11表2参20
To quantitatively determine the effect of different factors such as fracture width, dip angle, extension and filling material on Stoneley wave amplitude decreasing, the shock tube experiment method was changed from fixing the sample and vertically moving the sensor in the borehole to fixing the sensors along the shock tube wall and vertically moving the sample without drilling the borehole in it. The measurement accuracy and the signal-to-noise ratio of the first Stoneley wave were improved by the time corrections and amplitude corrections of Stoneley wave signals. At the same time, 21 sets of core models with different fracture parameters were processed for this measurement method by using full-diameter carbonate core, and relative amplitudes were defined to characterize Stoneley wave amplitude decreasing. The experimental results show that the relative amplitude of Stoneley wave exponentially decreases with increasing fracture width. The relative amplitude of Stoneley wave linearly decreases with increasing fracture dip angle. The relative amplitude of Stoneley wave exponentially decreases with increasing fracture extension. The relative amplitude of Stoneley wave decreases with increasing the permeability of filling material in the fracture. Under the above four conditions, the fracture width has the greatest effect on the decreasing of Stoneley wave amplitude, followed by the fracture extension and the permeability of filling material, and finally the fracture dip angle.
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