通过固体地层的声波测井P和S wave振幅的比较研究：对in situ应力和裂缝认识的贡献
Comparative study of P and S wave amplitudes of acoustic logging through solid formations : contribution to the knowledge of in situ stresses and fractures
摘要：
为了比较从不同钻孔中提取的P和S声波的振幅之间的比率，我们定义了一个称为幅度的特定波参数：对于每个炮点，我们将在不同深度记录的给定波的最大正振幅值和最小负振幅的绝对值相加。在致密地层中，S波和P波幅度的均方根之间的差异提供了一个值，该值似乎是钻孔所在区域的应力状态的特征。可以确定这些地层之间的事故，如裂缝或沉积节理，并很好地区分突破。
英文摘要：
In order to compare the ratios between the amplitudes of P and S acoustic waves drawn from various boreholes, we have defined a specific wave parameter called magnitude : for each shot, we have added the maximum positive amplitude values and the absolute values of the minimum negative amplitudes of a given wave recorded at different depths. In compact formations, the difference between the logarithms of the magnitudes of S and P waves provides a value that appears to be characteristic of the state of stress of the domain where a borehole is drilled. Accidents between those formations, such as fractures or sedimentary joints can be determined, and breakouts well distinguished.
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