Model-based dispersive processing of borehole dipole wave data using an equivalent-tool theory

Author:

Lee Sheng-Qing1,Tang Xiao-Ming1,Su Yuan-da1,Zhuang Chun-Xi1

Affiliation:

1. China University of Petroleum (East), School of Geosciences, Qingdao, China..

Abstract

We have developed a model-based processing technique for borehole dipole S-wave logging data to estimate formation shear slowness from the data. During dipole acoustic logging, the presence of the logging tool can significantly affect the dispersion characteristics of flexural waves. Therefore, modeling the effects of the tool is essential for model-based processing. We have determined that an equivalent-tool theory using only two parameters, tool radius, and modulus, can adequately model the flexural-wave-dispersion characteristics. We used this theory, together with a calibration procedure, to determine the tool parameters to formulate an inversion method for the logging data processing. Our use of the equivalent tool theory played an important role in fitting the theoretical dispersion curve to the actual flexural-wave-dispersion data, enabling fast processing of the field acoustic data. An advantage of this model-based method is its prediction power, which, in the absence of low-frequency dispersion data, allows for predicting formation shear slowness from the low-frequency limit of the model-fitted dispersion curve. We have also developed an application procedure of the method for field-data processing and demonstrated its effectiveness in the dispersion correction using field acoustic data from fast and slow formations.

Publisher

Society of Exploration Geophysicists

Subject

Geochemistry and Petrology,Geophysics

Reference22 articles.

1. Chen, S. T., and D. E. Willen, 1984, Shear wave logging in slow formations: Presented at the SPWLA 25th Annual Logging Symposium, DD.

2. Can we ever trust the shear-wave log?

3. Elastic wave propagation in a fluid‐filled borehole and synthetic acoustic logs

4. Centroid phase slowness as a tool for dispersion correction of dipole acoustic logging data

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