Q factor estimation based on the centroid frequency shift of energy spectrum
Yang Dengfeng1, Qin Chenggang1, Wang Ruiliang1, He Min1, Wang Shoudong2, Li Jingnan3
1. Research Institute, Shenzhen Branch, CNOOC, Shenzhen, Guangdong 518000, China;
2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
3. Geophysical Research Institute, SINOPEC, Nanjing, Jiangsu 211103, China
Abstract:High and low frequency components of amplitude spectra are susceptible to random noises, which will make the centroid frequency shift (CFS) method depend on the selection of frequency band. To overcome this problem, a novel Q extraction method based on the centroid frequency shift of energy spectrum is proposed in this paper. The analytical relation between the Q factor and the centroid frequency of the energy spectrum is derived. Numerical tests show that the estimated Q with the proposed method is less dependent on frequency bands and is more robust than the conventional CFS method. Applications to real VSP data shows that the estimated Q is reasonable, which demonstrates that the proposed method is practicable.
杨登锋, 秦成岗, 汪瑞良, 何敏, 王守东, 李京南. 能量谱质心频移法Q值估计[J]. 石油地球物理勘探, 2016, 51(5): 863-867.
Yang Dengfeng, Qin Chenggang, Wang Ruiliang, He Min, Wang Shoudong, Li Jingnan. Q factor estimation based on the centroid frequency shift of energy spectrum. OGP, 2016, 51(5): 863-867.
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