Q-factor inversion and calculation using zero-offset VSP data
Zhang Da-wei1,2, Sun Zan-dong1,3,6, Wang Xue-jun2, Zou Wen2, Feng Xiao-yan4, Lu Yao5
1. Lab for Integration of Geology and Geophysics, China University of Petroleum(Beijing), Beijing, 102249, China;
2. Geophysical Research Institute,BGP Inc.,CNPC,Zhuozhou,Hebei,072751, China
3. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum(Beijing),Beijing, 102249, China;
4. Petroleum Geophysical Exploration School,BGP Inc.,CNPC, Zhuozhou, Hebei, 072751, China;
5. School of Geosciences,Yangtze Univevsity, Jingzhou, Hubei, 434023, China
Abstract：Q-factor,which describes the seismic attenuation and the viscoelasticity of the formation,is an important physical parameter depicting seismic wave propagation.Therefore,Q-factor plays a significant role in high resolution seismic prospecting.Spectral ratio method(SRM) and centroid frequency shift(CFS) method are the most popular.In this paper,the concepts of the two methods are introduced first.Then the feasibility is tested by synthetic data.The inversion results show that both the two methods perform well while there is no noise in the inputs.Finally,stability of the two methods is verified by noised synthetic data,synthetic data of full wavefield and field zero-offset VSP data respectively,the results suggest that CFS is more reliable than SRM.
