摘要:
叠前CMP道集中,走时为双曲线的地震反射同相轴经过部分动校正( NMO)之后变为近似抛物线,当道集中缺失某些地震道时,可利用抛物线Radon变换通过迭代计算进行地震道的重建和恢复. 笔者基于抛物线Radon变换的基本原理,利用加权抛物线Radon变换的计算方法,进行叠前地震道的恢复和重建,并且在数据域对其加权系数进行改进和优化,模型数据和实际资料的试算结果表明,改进后的计算方法即使在较强的随机噪声下依然可以稳建同相轴,且避免了常规方法在重建过程中产生虚假同相轴的缺点,与原始的加权抛物线Radon变换的计算方法相比,新方法具有压制随机噪声的优点,即具有较好的抗噪性,计算精度也有所提高,且算法稳健、高效,具有良好的应用前景.
Abstract:
In the pre-stack CMP gathers,the events of seismic reflection approximate a hyperbola.After a partial NMO correction,the seismic events approximate parabola.When the gathers miss some seismic traces,parabolic Radon transform algorithm can be used by the iterative to reconstruct and recover the missing seismic traces.Based on the basic principle of parabolic Radon transform,the authors put forward the calculation method of weighted parabolic Radon transform for the reconstruction and recovery of missing pre-stack seis-mic traces,and improved and optimized the weighted coefficients in the data domain.Test results of model data and real data show that the improved calculation method still has a robust reconstruction result even under the strong random noise,and the method does not produce false events,compared with the calculation method of the original weighted parabolic Radon transform,the method has the ad-vantage of suppressing random noise,this is,the advantage of noise immunity.In addition,the calculation accuracy is also improved,and the algorithm has the characteristics of steadiness and high efficiency.
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