横向同性弹性地层中全波波形数值分析

Numerical Analysis of Full Waveform Acoustic Logs in Transversely Isotropic Elastic Strata

数值模拟了横向各向同性地层中单极子、偶极子测井全波波形。通过对不同频率的理论波形进行比较分析，结果表明，用单极子源波形中体波波至确定各向异性是不可能的，而用导波特别是斯通利波特性有可能确定出地层的各向异性；对于偶极子源，横向同性地层与均匀地层的波形差异不大，但其幅度有差异；体波波至与弹性参数有密切的关系。

Full waveform logs with monopole and dipole in transversely isotropic elastic strata are modeled numerically. By comparing and analyzing the synthetic waveforms of various frequencies,results show that the body wave arrival of reservoir's waveform with monopole can not be used to estimate anisotropic formation and guided waves, especially Stonely wave, may do it. To dipole resource, the difference between waveforms of isotropic and homogeneous formations is small but their amplitudes are different. The body wave arrival is closely related to the elastic parameters of the formations.