Q estimation with lateral constraint based on local time-frequency transform
Liu Xiheng1, Liu Guochang2, Cui Yongqian1, Wang Zedan1, Liu Ying2, Bai Xuming3
1. Geophysical Exploration Research Institute, Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062552, China;
2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
3. Huabei Geophysical Exploration Department, BGP Inc., CNPC, Renqiu, Hebei 062552, China
Abstract：Q estimation with the spectrum ratio is usually unstable due to noise, coherent reflection and transform window. To overcome this problem, we propose a method for Q estimation with lateral constraint based on local time frequency transform. Local time-frequency transform is obtained by the least square inversion method to get a smooth local time spectrum, which provides a good time frequency spectrum for Q estimation. On the basis of local time-frequency transform, we introduce lateral constraint, limit lateral smooth variation of Q value, and establish a novel method for calculating the spectrum ratio using the least square inversion theory. Compared with the conventional spectral ratio method, results obtained by the proposed method are more accurate. Numerical simulation and real data processing show that the proposed method is effective.
刘喜恒, 刘国昌, 崔永谦, 王泽丹, 刘颖, 白旭明. 局部时频变换横向约束Q值估计方法[J]. 石油地球物理勘探, 2016, 51(5): 868-874.
Liu Xiheng, Liu Guochang, Cui Yongqian, Wang Zedan, Liu Ying, Bai Xuming. Q estimation with lateral constraint based on local time-frequency transform. OGP, 2016, 51(5): 868-874.
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