VTI各向异性叠前深度偏移技术应用研究——以JZ工区三维地震资料处理为例

Application of VTI anisotropic prestack depth migration technique for 3D seismic data processing in JZ area

CNPC东方地球物理勘探有限责任公司研究院处理中心,河北涿州072750

Zhao Lingzhi,Seismic Data Processing Centre,BGP,Zhuozhou 072750,China

实际地下介质广泛存在各向异性，采用各向同性叠前深度偏移方法成像精度较低。在理论分析的基础上，给出了一套VTI各向异性叠前深度偏移处理流程，即在各向同性叠前深度偏移的基础上，求取VTI各向异性参数，进行VTI各向异性叠前深度偏移。将该流程应用于JZ工区实际资料处理中，并与各向同性叠前深度偏移成像效果进行了对比，结果表明，VTI各向异性叠前深度偏移技术是提高复杂构造的成像精度、改善成像效果的有效方法。

Actual subsurface media is characterized by extensive anisotropy,which leads to relatively low imaging accuracy by using isotropic prestack depth migration method.Therefore,a workflow of VTI anisotropic prestack depth migration was proposed.On the basis of isotropic prestack depth,VTI anisotropic parameters are obtained and VTI anisotropic prestack depth migration is carried out.The workflow was applied to the data processing in JZ block.The comparison between VTI anisotropic and isotropic prestack migration result indicate that VTI anisotropic prestack depth migration can improve the imaging accuracy of complex faulted area.