An enhanced broad-frequency-band apparatus for dynamic measurement of elastic moduli and Poisson’s ratio of rock samples

We built a broad-frequency-band measurement system for rock elastic parameters based on the stress-strain method following Batzle et al., Geophysics 71, N1–N9 (2006). The system gives strain amplitude anomalies at some measurement frequencies. These anomalies put limitations on the range of the meas...

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Bibliographic Details
Published in:Review of scientific instruments 2018-06, Vol.89 (6), p.064503-064503
Main Authors: Sun, Chao, Tang, Genyang, Zhao, Jianguo, Zhao, Liming, Wang, Shangxu
Format: Article
Language:English
Subjects:
Anomalies
Computer simulation
Elastic properties
Finite element method
Geophysics
Mathematical models
Modulus of elasticity
Poisson's ratio
Rangefinding
Robustness (mathematics)
Rocks
Scientific apparatus & instruments
Seismic analysis
Strain
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Summary:We built a broad-frequency-band measurement system for rock elastic parameters based on the stress-strain method following Batzle et al., Geophysics 71, N1–N9 (2006). The system gives strain amplitude anomalies at some measurement frequencies. These anomalies put limitations on the range of the measurement frequency and jeopardize the credibility of the measurement results over a broad frequency band. To overcome these limitations, we investigated the cause of these anomalous strains by numerical model simulations with a finite element method based on the experimental apparatus. Through the systematic analysis of the modeling results, we conclude that the resonances caused by non-axial perturbations lead to such anomalous measurement results. Based on the analysis, we give a solution to reduce the effect of the resonances and shift the first resonance frequency beyond the frequency band of 1-2000 Hz. The enhanced measurement system can provide robust and reliable measurements on the elastic parameters of rocks between 1 and 2000 Hz, which is crucial for a quantitative study of the frequency-dependent phenomenon related to fluid effects. This in turn will provide a powerful tool for the experimental characterization of elastic properties of oil/gas reservoir rocks, thus laying a solid foundation for low-frequency rock physics analysis and quantitative seismic interpretation.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.5018152