科研之友
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摘要
In industry application, wavefield simulation with finite difference numerical method is always applied for reverse time migration algorithm. But the above approach is limited by stability conditions and numerical dispersion, which would reduce the imaging precision. In this paper, we introduced one step wavefield extrapolation method. Firstly, we constructed the acoustic propagation operator, then approximated the exponent item in the propagation operator by Chebyshev and Jacobi-Anger polynomial expansions to accomplish the wavefiled extrapolation algorithm. The proposed wavefield simulation algorithm is unconditionally stable in the chosen of time-step size and free of the numerical dispersion. We exploited one step method to the wavefield simulation of reverse time migration, then we proposed a Duo-buffer storage strategy, which can reduce the wavefield storage content obviously without computation increase. Examples of wavefield simulation and reverse time migration show that: 1. the proposed one step method could extrapolate wavefield accurately, be free of dispersion noise for large time-step size; 2. the one step method can be well applied to the reverse time migration algorithm; 3. the proposed Duo-buffer storage strategy could highly reduce the wavefield storage of reverse time migration. based on one step method.
- 出版日期2017-11
- 单位东北石油大学
