一种基于分频编码的最小二乘裂步偏移方法

Least-squares split-step migration based on frequency-division encoding

相位编码是提高海量数据处理效率的重要策略,目前已逐步用于地震叠前偏移成像和全波形反演研究。本文在传统静态和动态编码的基础上,在频率域对炮集采用分频方式进行编码,实现了一种基于分频编码方式的最小二乘裂步偏移方法。通过模型试算及不同编码方式的对比得到如下几点认识:1通过对国际标准盐丘模型成像试处理,验证了方法的正确性;2通过对不同编码方式的成像效果对比表明,本文介绍的分频编码方式既能获得较好的偏移效果,又能在一定程度上提高海量数据偏移成像效率。

Phase encoding is one of the important strategies to improve mass data processing efficiency and it has been gradually used in seismic prestack migration imaging and full waveform inversion.We propose in the paper a new migration approach based on frequency-division encoding.Based on encoding shot records in the frequency domain before migration,we implement the least-squares splitstep migration with frequency-division encoding.We get the following observations by model tests:1The validity of the method is proved by SEG/EAGE salt model processing;2Through the comparison of the imaging results with different encoding schemes,we find that frequency-division encoding can not only obtain high-quality migration,but also improve the efficiency of migration of mass data.