Variation characteristics of seismic wavelet centroid frequency
Wang Zongjun1, Fan Tinen1, Ma Shufang1, Fan Hongjun1, Zhang Huilai1, Ma Yuanyuan2
1. CNOOC Research Institute, Beijing 100028, China;
2. College of Geophysics and Information Engineering, China University of Petroleum (Beijing), Beijing 102249, China
Abstract：The basic theory of seismic wave absorption and attenuation is described in this paper, and methods to estimate quality factors by centroid frequency shift (CFS) can be classified into different categories, such as Gaussian CFS, MBMSW CFS, Ricker CFS, weighted CFS, modified weighted CFS, impulse CFS, Taylor CFS. Model and VSP data tests show three conclusions as follows. Firstly, the longer travel time of seismic wavelet is, the smaller centroid frequency is; when travel time is small, centroid frequency has a linear relationship with travel time; otherwise, the relationship between them is hyperbolic. Secondly, the smaller Q value is, the faster the decline of centroid frequency is. Finally, Gaussian CFS and Taylor CFS are with higher accuracy when travel time is small, weighted CFS needs higher requirements for spectral fitting; the accuracy of other methods is relatively lower than above methods.
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