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本文严格应用孔隙介质的弹性波理论对被流体饱和孔隙介质包围的充满流体裸眼井中局部脉冲声源的辐射声场进行了理论求解,并对不同孔隙度和渗透系数的全波声压波形曲线进行了数值计算。讨论了渗透性地层对声传播的影响。结果表明:滑行纵波(第一类纵波)的声波时差与孔隙度在相当宽的范围里有近线性的对应关系而与频率和渗透系数的变化几乎无关;这为建立在经验的线性时间平均公式基础上的声速—孔隙度测井提供了理论依据;stoneley波的振幅变化对孔隙度与渗透系数均较敏感,它的强衰减特性是区别于均质地层情况的一个显著特征,是声波测井值得利用的信息。
In this paper, the elastic wave theory of porous media is applied rigorously to solve the radiated sound field of local pulsed sound source in a fluid-filled open-hole well surrounded by fluid-saturated porous media. The waveforms of full-wave sound pressure waveforms with different porosity and permeability coefficients Numeral Calculations. The effect of permeability on sound propagation is discussed. The results show that the sonic time-lapse of the gliding longitudinal wave (the first type of longitudinal wave) has a near linear correlation with the porosity over a relatively wide range and has little to do with the changes of the frequency and the permeability coefficient. This is based on the empirical linear time-averaged formula Based on the sound velocity - porosity logging provides a theoretical basis; stoneley wave amplitude changes on the porosity and permeability coefficient are sensitive to its strong attenuation characteristics are different from the homogeneous formation of a prominent feature is the acoustic logging Worthwhile information.