Least squares migration of full wavefield based on one-way wave operator
YE Yueming1, ZHONG Shichao2, FAN Guozhang1, REN Haoran3, WANG Zhaoqi1
1. PetroChina Hangzhou Research Institute of Geology, Hangzhou, Zhejiang 310023, China; 2. Yangtze River Research Institute of Beijing Institute of Technology, Jiaxing, Zhejiang 314019, China; 3. Institute of Advanced Technology, Zhejiang University, Hangzhou, Zhejiang 310027, China
Abstract：Traditional migration methods are based on the assumption that the wave field reflects once. In fact, complete seismic imaging should be the contribution of all the subsurface wavefields (primaries and multiples). To improve the imaging quality with full wavefield information, this paper studies full wavefield least squares migration (FW-LSM) based on a one-way propagation operator. Firstly, the upper and lower reflection coefficients are introduced to derive the forward operator based on a one-way propagation operator with closed-loop continuation and simulate full wavefield information under the smooth velocity model. Secondly, 2-norm-based least squares error functional and gradient term expressions of the full wavefield are solved to construct the least squares migration according to the inversion framework. Finally, the validity of the proposed method is tested by the lens model and Marmousi model with a water layer. Additionally, multiple inversion iterations suppress crosstalk generated by complex wavefields, and the imaging quality is significantly improved by adopting multiple reflection wave information. This study provides new seismic imaging methods and is of practical and popularization values, especially for seismic data processing in deep marine areas with strong multiples.
叶月明, 钟世超, 范国章, 任浩然, 王兆旗. 基于单程波算子的全波场最小二乘偏移方法[J]. 石油地球物理勘探, 2023, 58(5): 1142-1151.
YE Yueming, ZHONG Shichao, FAN Guozhang, REN Haoran, WANG Zhaoqi. Least squares migration of full wavefield based on one-way wave operator. Oil Geophysical Prospecting, 2023, 58(5): 1142-1151.
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