用声波全波列评价薄互储集层

针对孔隙地层薄层声波测井问题，通过声压－速度有限差分数值模拟，分析了不同性质、不同厚度的水平薄层和薄互层在声波全波列波形中引起的不同特征变化。全波列各组分波在任意分层界面处都会产生反射波，其中低频斯通利波反射最为突出，反射波的幅度主要取决于薄层与围岩地层之间的声阻抗差异。当薄层性质由软地层变为水层时，反射波幅度增大，纵波幅度衰减严重。通过波形滤波处理，可根据各组分波面上下的时差，幅度变化及斯通利波的反射系数变化，分辨薄互层的位置和大致厚度。

Evaluating Thin Interbedded Reservoir from Acoustic Full Waveform Train

The effect of horizontal thin beds and interbeds with various properties and thickness on acoustic full waveform logs in porous sandstone is studied by using numerical model of pressure velocity finite difference There are reflections of the P wave, S wave and Stoneley in an arbitrary interface of formation ,and the reflection of the Stoneley wave is most evident in full waveforms The reflection amplitude depends primarily on the impedance difference between the thin bed and surrounding formation When the thin bed is changed from soft layer to water layer, the reflection amplitude is increased and the attenuation of P wave is severe The changes of various components through filtering, amplitude and reflection coefficient can be used to determine the location and rough thickness of thin interbeds