Elastic wave propagation in a fluid-filled borehole and synthetic acoustic logs
Elastic wave propagation in a fluid-filled borehole and synthetic acoustic logs
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DOI：
10.1190/1.1441242
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发表时间：
1981-07
期刊：
影响因子：
3.3
通讯作者：
Chuen Hon Arthur Cheng;M. Toksöz
中科院分区：
文献类型：
--
作者：
Chuen Hon Arthur Cheng;M. Toksöz
利用频散曲线和合成微震全波声波测井模型，研究了导波在充液井眼中的传播和频散特性。比较了中心有工具和无工具钻孔中的伪瑞利(反射)波和斯通利波的频散特性。计算了不同刀具特性的影响。刚性工具的作用是使有效井眼半径变小。作为一种近似，有工具的井眼中导波的频散特性可以被计算为有效半径较小的纯充液井眼。利用离散波数积分计算了弹性波在井眼中传播的理论波形(微震图)。选择适当的参数，我们的结果看起来与在石灰岩和页岩地层中记录的声波波形相似。有几个因素影响声波测井微地震记录的形状。有效的辐射..。
The propagation and dispersion characteristics of guided waves in a fluid‐filled borehole are studied using dispersion curves and modeling full‐wave acoustic logs by synthetic microseismograms. The dispersion characteristics of the pseudo‐Rayleigh (reflected) and Stoneley waves in a borehole with and without a tool in the center are compared. Effects of different tool properties are calculated. The effect of a rigid tool is to make the effective borehole radius smaller. As an approximation, dispersion characteristics of the guided waves in a borehole with a tool can be calculated as a purely fluid‐filled borehole with a smaller effective radius. Theoretical waveforms (microseismograms) of elastic waves propagating in a borehole are calculated using a discrete wavenumber integration. With an appropriate choice of parameters, our results look similar to the acoustic waveforms recorded in a limestone and a shale formation. Several factors affect the shape of an acoustic log microseismogram. The effective rad...