摘要
针对孔隙地层薄互层声波测井问题， 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， 可根据各组分波界面上下的时差、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。
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
出处
《江汉石油学院学报》
CSCD
北大核心
1999年第4期85-87, ,共3页
Journal of Jianghan Petroleum Institute
基金
中国石油天然气集团公司 "九五"重点科技项目!970302 03
关键词
声波测井
有限差分法
全波列
薄互层
油气储集层
acoustic logging
finite difference method
full waveform,reflected waves
porous formation
thin interbeds
