VTI介质转换波动态聚焦束偏移成像方法研究

采用多分量地震数据进行处理,可以得到高质量的转换波成像结果,进而为流体识别和裂缝预测等提供有效支持.本文在前人研究的基础上,通过求解各向异性介质qPSV转换波运动学和动力学射线追踪方程,获得转换波中心射线走时、路径及动力学信息;同时,通过修改动态聚焦型传播算子,构建出各向异性介质动态聚焦束,提出了一种各向异性介质转换波...

Dynamical focused-beam migration of converted waves in VTI media

Multi-component seismic data are been processed and interpreted in geophysical exploration. Through the processing of multi-component seismic data, the information of longitudinal and shear waves can be effectively used. Then the high-quality converted wave imaging results can be obtained, which further affect fluid identification and fracture prediction. Thus, an anisotropic ray tracing algorithm for qPSV converted wave is proposed by deriving the ray tracing equations of kinematics and dynamics on the basis of previous research. In this paper, the anisotropic ray tracing algorithm is introduced into Gaussian beam migration and an anisotropic dynamical focused-beam migration of converted waves method is proposed by applying dynamically focused beam propagation operator. The results of model test demonstrate that the method can effectively image geological structures with low velocity in complex anisotropic media by applying the information of longitudinal and shear waves. Compared with the conventional converted wave Gaussian beam migration in anisotropic media, the method studied in this paper can make the energy more focused and improve the imaging quality in the deep layer without reducing the imaging quality in the shallow layer. In this paper, the model results show the accuracy and validity of the method proposed.