阵列声波资料的斯通利波提取及裂缝评价

Extraction of Stoneley Waveform and Evaluation of Fracture Information from Array Acoustic Logging Waveforms

宽频带阵列声波测井仪可以较完整地记录井内斯通利波波场．采用数宇低通滤波和多道中值滤波方法较好地实现了斯通利波的波场分离．根据直接斯通利波与分离出的反射斯通利波计算斯通利波的反射率，反射率曲线的极值位置与渗透性裂缝位置对应；反射率的大小与反射斯通利波的能量强弱对应。最后提出了３种对裂缝进行定量评价的途径。

The broad band array sonic logging tool can record the Stoneley wavefield in a wellbore. The Stoneley wavefield can be separated effectively by using a lowpass filter and a multi - trace median filter. From the Stoneley waveforms, their reflectivities can be calculated. The points with the larger reflectivities are corresponding to the permeable fractures in depth. The ampltitudes of these reflectivities are proportional to the Stoneley energy. Finally, some practicable methods that estimate the effective apertures and permeability of fractures using the reflectivities are discussed.