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Q Factor Estimation Based on the Central Frequency Shift of Power Spectrum
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 78th EAGE Conference and Exhibition 2016, May 2016, Volume 2016, p.1 - 5
Abstract
Summary
Q factor is an important parameter to describe the viscoelasticity of formation. Accurate estimation of Q factor is important to improve the resolution of seismic data, image and interpret subsurface precisely, and predict and describe reservoirs. Currently, the centroid frequency shifting of amplitude spectrum (CFS) method is one widely used Q estimation approach. However, the amplitude spectra at high and low frequencies are susceptible to random noise, which makes the robustness of Q estimation using CFS method depend on the selection of frequency band. In order to flexibly select the frequency band and to improve the robustness of Q estimation in the CFS method, a novel method of Q extraction method based on the central frequency shift of the power spectrum is proposed in this paper. Meanwhile the analytical relation between Q factor and the central frequency of power spectrum is derived. Numerical tests show that the estimated Q with the new method is less dependent on frequency band and more robust than that with the traditional CFS method. Finally, our method is applied to real VSP data, and it demonstrates that the estimated Q is reasonable and that the proposed method is practicable.
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