【摘要】 在叠前深度偏移提取的角度域共成像道集中可以对多次波进行衰减,对于给定一个准确偏移速度模型,多次波和一次波具有不同的角度域时差,根据这一特征,实现一次波和多次波的分离。本文在提取的角度域共成像道集中,应用改进的频率域拉冬变换,分离一次波和多次波,由于每个角度域共成像道集皆包含复杂的三维地震波场传播效应,所以该方法具有处理三维地震资料和复杂地下构造的能力。相比于波动理论衰减多次波和传统拉冬变换衰减多次波方法,该方法在提高效率的同时,保证了衰减多次波的准确性。更多还原

【Abstract】 The multiples could be suppressed in the angle-domain common-image gathers(ADCIGs) extracted from pre- stack depth migration. The primaries and multiples have different time difference in the ADCIGs for a correct given velocity model, the primaries and multiples could be separated according to their characteristics. In the paper, the primaries and multiples are separated by the improved Radon transform in the extracted ADCIGs. Each ADCIG include complex 3D seismic wave field propagation effect, so this method has the ability to deal with the 3D seismic data and complex subsurface structure. Compared with the wave propagation theory and the traditional Radon transform to suppress the multiples, the accuracy of the multiple suppression could be ensured by this method meanwhile the efficiency is also improved.更多还原