期刊
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
卷 60, 期 -, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TGRS.2021.3126002
关键词
3-D; conical wave encoding; curvilinear-tau domain; least-squares reverse time migration (LSRTM)
类别
资金
- Seismic Wave Propagation and Imaging (SWPI) Group, China University of Petroleum (East China)
- National Natural Science Foundation of China [42174138, 41904101, 42074133]
- Natural Science Foundation of Shandong Province [ZR2019QD004]
- Major Scientific and Technological Projects of the China National Petroleum Corporation (CNPC) [ZD2019-183-003]
- Yong Elite Scientists Sponsorship Program through the China Association for Science and Technology
This paper introduces a curvilinear-grid-based least-squares reverse time migration (LSRTM) method that can produce better images of complex subsurface structures in 3D cases. It achieves higher signal-to-noise ratio, improved resolution, and significantly improves computational efficiency.
Curvilinear-grid-based least-squares reverse time migration (LSRTM) can produce an accurate image of complex subsurface structures. However, a huge amount of computational cost of LSRTM makes it difficult in real data applications, especially in 3-D cases. We propose a wavefield continuation operator in a new curvilinear-tau domain to make the sampling space in the vertical direction to be uniform by stretching and compressing the low- and high-velocity zones, respectively. An objective function based on a conical wave encoding and student's T distribution is constructed to improve the computational efficiency and robustness of LSRTM. The gradient formula is derived based on the objective function, and to correct the unbiased random estimation error, the idea of random optimization is introduced to obtain a weighted gradient. Demigration and adjoint wave equations in the curvilinear-tau domain are derived to calculate the synthetic records and the backward-propagated wavefields. Numerical examples on synthetic and field datasets suggest that the proposed 3-D LSRTM method produces better images with a higher signal-to-noise ratio (SNR), more improved resolution, and more balanced amplitude than the conventional 3-D LSRTM and greatly improves the computational efficiency of 3-D LSRTM.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据