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叠前地震波形反演能够提供详细的地下地层特征,但由于其计算量大、数据和模型之间的非线性、目标函数的多极值和反演结果的多解性使叠前地震反演的实施成为一大难点。本文通过叠前和叠后混合反演技术采用遗传算法实现了深海无井地震反演。遗传算法思想简单、易于实现和使用、具有隐含并行性和全局搜索能力等优点,基于遗传算法的叠前地震波形反演得到了与井中实际数据基本吻合的速度和密度数据。
Prestack seismic waveform inversion can provide detailed subsurface stratigraphic features, but due to its large amount of calculation, nonlinearity between data and model, multi-extreme value of objective function and multi-solution of inversion results, pre-stack seismic inversion The implementation of a major difficulty. In this paper, seismic inversion of deep sea without well is implemented by genetic algorithm using pre-stack and post-stack hybrid inversion. The genetic algorithm is simple, easy to implement and use, has the advantages of implicit parallelism and global search ability. The prestack seismic waveform inversion based on genetic algorithm has obtained the velocity and density data basically consistent with the actual well data.