自动拾取的成像空间域走时层析速度反演

Image domain travel-time tomography velocity inversion based on automatic picking

本文研究了一种成像空间域走时层析速度反演方法,利用波动方程双平方根算子叠前深度偏移提取的角度域共成像点道集(ADCIGs)作为速度分析道集,并基于剩余曲率自动拟合策略获取高精度的走时差。文中不仅给出ADCIGs道集剩余曲率自动拟合拾取的主要思路,而且给出成像空间域层析反演的实现。模型和实际资料试算验证了该方法具有较高的反演精度和计算效率。

This paper proposes an image domain travel-time tomography velocity inversion method,which uses the angle domain common imaging gathers(ADCIGs) by prestack depth migration with wave equation double square root operator as the gathers of velocity analysis,and obtains accurate travel-time residual by automatic fitting picking strategy of residual curvature.The paper not only presents the main methodology of automatic fitting picking strategy in ADCIGs,but also provides the implementation of image domain tomography inversion.Examples of this method from the synthetic dataset and real dataset show a high precision and efficiency of velocity inversion.