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《Oil Geophysical Prospecting》 2014-01
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True-amplitude imaging based on least-squares reverse time migration

Guo Zhenbo;Li Zhenchun;School of Geosciences, China University of Petroleum (East China);  
Conventional reverse time migration(RTM) has disadvantages such as low frequency imaging, heavy noise,high requirements for acquisition, lack of compensating transmission losses and etc. In this paper,we propose a method for true-amplitude imaging based on least-squares reverse time migration.We treat the true-amplitude imaging as a linear inversion problem.Firstly,we derive the linearized wave propagation operator which is also called de-migration operator,and then we do some theoretical derivation on least-squares reverse time migration(LSRTM).Numerical tests on a multilayer model and Marmousi model prove that LSRTM obtains true-amplitude imaging with higher imaging resolution than conventional reverse time migration,and the noise was also well suppressed.
【Fund】: 国家自然科学基金(40974073);; 国家“863”课题(2011AA060301);; 中央高校基本科研业务费专项资金(13CX06014A)联合资助
【CateGory Index】: P631.44
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