应用地球物理（英文版）
應用地毬物理（英文版）
응용지구물리（영문판）
APPLIED GEOPHYSICS
2011年
1期
69-78
,共10页
苏远大%唐晓明%黑创%庄春喜
囌遠大%唐曉明%黑創%莊春喜
소원대%당효명%흑창%장춘희
Equivalent theory%acoustic tool modeling%impedance match%guided wave
The influence of an acoustic logging tool on borehole guided wave propagation should be cons'idered in the processing and inversion of the guided waves for formation acoustic property estimation.This study introduces an equivalent-tool theory that models the tool response using an elastic rod with an effective modulus and applies the theory to multipole acoustic logging for both wireline and logging while drilling (LWD) conditions.The theory can be derived by matching the tool's acoustic impedance/conductance to that of the multipole acoustic wavefield around the tool, assuming that tool radius is small compared to wavelength.We have validated the effectiveness and accuracy of the theory using numerical modeling and its practicality using field data.In field data applications, one can calibrate the tool parameters by fitting the theoretical dispersion curve to field data without having to consider the actual tool's structure and composition.We use a dispersion correction example to demonstrate an application of the simple theory to field data processing and the validity of the processing result.
