用频率-波数域分析研究声波测井全波列的各波相

To Study Each Mode of Acoustic Full-wavetrains Using Frequency-Wavenumber Analysis.

以柱状多层开放声波导物理模型为基础 ,利用实轴积分法通过数值计算得到井内接收器接收到的全波 ,并利用频率-波数域分析法对组成全波的各波相进行考察 ,着重分析了裸眼井快速地层、套管井水泥环不同胶结状态下组成全波的各分波的激发和传播特性。应用这一分析方法可以对各种井况下井内声场进行深入细致的研究 ,为充分利用声波测井全波列中携带的信息提供了理论依据。

On the basis of axisymmetric multilayered borehole model, computed is full waveform at the receiver by the discrete wavenumber method. The frequency wavenumber analysis method is used to study each mode of the full waveform. Mainly analysed are exciting and propagating characters of each mode in “fast” formation of open hole and under various cement conditions of cased hole. This method allows to deeply investigate borehole acoustic field under different borehole conditions. It provides theoretical basis for gaining more information from the full waveform acoustic logging.