石油地球物理勘探2019，Vol.54Issue(2)：341-347,前插3-前插4,9.DOI:10.13810/j.cnki.issn.1000-7210.2019.02.012
VTI介质角度叠加逆时偏移
Reverse time migration in VTI media based on ADCIGs
摘要
Abstract
Conventional isotropic reverse time migration (RTM )method can lead to inaccurate imaging and unfocused seismic event energy when dealing with the anisotropic problem,and the strong amplitude and low frequency noise in the RTM imaging results cannot be completely removed by simple filtering methods such as Laplace filter operator.In order to solve these problems, we apply acoustic approximate equation to simulate the wavefield propagation of qP wave in VTI medium, eliminate the influence of qSV wave through setting smooth isotropic or elliptic anisotropic source ring at source locations.On this basis,the angle domain common imaging gathers(ADCIGs)superposition implementation strategies of RTM in VTI medium has been developed,which use the superposition of imaging results with different angles in ADCIGs to suppress the low-frequency noise and improve the imaging precision. Model tests and real dataset examples verify that the proposed approach can obtain the accurate imaging in complex steep structures with better energy balance and lower low-frequency noise.关键词
各向异性/VTI介质/逆时偏移/角度叠加/坡印廷矢量Key words
anisotropy/VTI medium/reverse time migration(RTM)/angle superposition/Poynting vector分类
天文与地球科学引用本文复制引用
秦宁..VTI介质角度叠加逆时偏移[J].石油地球物理勘探,2019,54(2):341-347,前插3-前插4,9.基金项目
本项研究受"十三·五"国家科技重大专项"渤海湾盆地精细勘探关键技术"(2016ZX05006)、中国石化优秀青年科技创新基金"潜山内幕散射波叠前深度偏移技术研究"(P18028-1)以及胜利油田重点科技攻关项目"地震数据压缩感知重建技术研究"(YKW1704)联合资助. （2016ZX05006）
