Q factor estimation based on frequency-weighted-exponential function of power spectrum
Duo Zheng, Youcai Tang, Fenglin Niu, Yumeng Jiang · 2018
The quality factor Q is a powerful tool for hydrocarbon detection and reservoir characterization in seismic data processing and interpretation. There are various methods for Q estimation, such as centroid frequency shift method (CFS), frequency weighted exponential method (FWE) and peak frequency shift (PFS). However each method has its own limitations. The frequency-weighted-exponential (FWE) function can fit various asymmetric amplitude spectrum by two key parameters: symmetry index and bandwidth factor. In this paper, we use the mean frequency and its deviation of power spectrum to calculate the two parameters of FWE function. In this way, the new FWE function can fit both asymmetrical and symmetrical amplitude spectrum accurately. Meanwhile we recalculate the symmetry index by the average of the symmetry indexes of source wavelet and received wavelet to estimate Q factor. Synthetic data test proves that this proposed method is more robust to random noise compared with the existing methods. Presentation Date: Tuesday, October 16, 2018 Start Time: 1:50:00 PM Location: Poster Station 12 Presentation Type: Poster