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| A comparison of the inverse Q filtering methods based on wavefield continuation |
| YU Dai1, HE Zhi-Jun2, SUN Yuan1, WANG Ying1 |
1.College of Geology Engineering and Geomatics,Chang'an University,Xi'an 710054,China;
2.Guangdong Hualu Transport Technology Co. Ltd.,Guangzhou 510420,China |
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Abstract Wavefield continuation algorithm is the most common inverse Q filtering method;nevertheless,due to the unstability of amplitude factor,part of the high frequency is magnified,which affects the results of inverse Q filtering.It is thus confirmed that complete stability amplitude compensation is only related to Glim by formula derivation,which causes difficulty to improve deep seismic wave resolution.The authors systematically analyzed the filter properties of different amplitude compensation operators in the wavefield continuation inverse Q filtering.Gain control compensation method is neither magnify nor suppress a certain frequency.Regularized and iterative compensation methods not only have strong anti-noise capability but also have better amplitude compensation capability for deep seismic waves.By applying different amplitude compensation operators to theoretical models and actual data of cross-well seismic data,the authors found that regularized and iterative amplitude compensation factors have strong suppression effects on high-frequency interference;for middle and deep part of seismic records and seismic records with low-Q energy attenuation,they also have better compensation effects.
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Received: 11 December 2017
Published: 03 April 2018
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