起伏地表地震波场角度域照明分析
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摘要
角度域照明可以更加细致地对地下复杂地质体进行照明分析。提出了一种适用于起伏地表条件下的角度域照明分析方法,其主要过程是利用局部倾斜叠加技术分解波场,对起伏地表处采用加权函数判定局部时窗内的振幅包络位置,以区分其位于地表之上或之下;并引入相似系数函数计算反假频局部平面波场,根据局部斜率与平面波场入射角关系,得到局部角度域地震波场;根据帕斯瓦尔等式下的时间-角度域照明关系式,计算得出角度域照明强度。通过起伏地表高速侵入矿体模型试算,得到给定观测系统下角度域照明强度与地下分析点照明随炮点、波场入射角的变化关系。此方法可用于起伏地表条件的观测系统优化、叠前AVA分析等方面。
Angle domain illumination can be used to analyze underground complex geological body.In this paper,we proposed a method of angle-domain illumination analysis at rugged surface.The main process is using local slant stack technique to decompose seismic wavefield,and judging weighting function for rugged surface to determine the aptitude of the Green function within local time window to distinguishing whether it is above or underneath the surface.Semblance function to calculate local plane wavefield for anti-aliasing is introduced.According to the relationship between local slope of the plane wavefield and angle of incidence,we obtained the local angle domain seismic wavefield.Using the relationship between time-angle domain illumination and Paz Val equation,we calculated the illumination intensity in angle domain.During a test on an ore body under rugged surface,we acquired the angle domain illumination intensity and the relationship between the intensity of the underground point and the position of shot and the incident angles of the wavefield in the given observing systems.This method could be applied to optimizing observing systems on ragged surface and pre-stack AVA analysis.
Angle domain illumination can be used to analyze underground complex geological body.In this paper,we proposed a method of angle-domain illumination analysis at rugged surface.The main process is using local slant stack technique to decompose seismic wavefield,and judging weighting function for rugged surface to determine the aptitude of the Green function within local time window to distinguishing whether it is above or underneath the surface.Semblance function to calculate local plane wavefield for anti-aliasing is introduced.According to the relationship between local slope of the plane wavefield and angle of incidence,we obtained the local angle domain seismic wavefield.Using the relationship between time-angle domain illumination and Paz Val equation,we calculated the illumination intensity in angle domain.During a test on an ore body under rugged surface,we acquired the angle domain illumination intensity and the relationship between the intensity of the underground point and the position of shot and the incident angles of the wavefield in the given observing systems.This method could be applied to optimizing observing systems on ragged surface and pre-stack AVA analysis.
引文
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[15]薛东川,王尚旭,焦淑静.起伏地表复杂介质波动方程有限元数值模拟方法[J].地球物理学进展,2007,22(2):522-529.Xue Dongchuan,Wang Shangxu,Jiao Shujing.WaveEquation Finite-Element Modeling Including RuggedTopography and Complicated Medium[J].Progressin Geophysics,2007,22(2):522-529.
[16]李博,刘红伟,刘国峰,等.地震叠前逆时偏移算法的CPU/GPU实施对策[J].地球物理学报,2010,53(12):2938-2943.Li Bo,Liu Hongwei,Liu Guofeng,et al.Computational Strategy of Seismic Pre-Stack ReverseTime Migration on CPU/GPU[J].Chinese Journal ofGeophysics,2010,53(12):2938-2943.
[2]李万万.基于波动方程正演的地震观测系统设计[J].石油地球物理勘探,2008,43(2):134-141.Li Wanwan.Design of Seismic Geometry Based onWave Equation Forward Simulation[J].OilGeophysical Prospecting,2008,43(2):134-141.
[3]杨敬磊,李振春,叶月明,等.地震照明叠前深度偏移方法综述[J].地球物理学进展,2008,23(1):146-152.Yang Jinglei,Li Zhenchun,Ye Yueming,et al.Review of Seismic Illumination Pre-Stack DepthMigration Methods[J].Progress in Geophysics,2008,23(1):146-152.
[4]Rietveld W E A,Berkhout A J,Wapennar C P.Optimum Seismic Illumination of HydrocarbonReservoirs[J].Geophysics,1992,57(10):1334-1345.
[5]陈生昌,王汉闯.基于平面波照明的偏移成像补偿[J].地球物理学报,2010,53(7):1710-1715.Chen Shengchang,Wang Hanchuang.MigrationCompensation with Plane Wave Illumination[J].Chinese Journal of Geophysics,2010,53(7):1710-1715.
[6]朱金平,董良国.地震波双向照明的概念及计算方法[J].地球物理学报,2011,54(11):2933-2942.Zhu Jinping,Dong Liangguo.The Concept andCalculation Method of Bi-Directional SeismicIllumination[J].Chinese Journal of Geophysics,2011,54(11):2933-2942.
[7]皮红梅.双程波动方程数值模拟和照明分析方法研究[D].长春:吉林大学,2009.Pi Hongmei.Method Research on Two-Way Wave-Equation Forward Modeling[D].Changchun:JilinUniversity,2009.
[8]Wu R S,Chen L.Directional Illumination AnalysisUsing Beamlet Decomposition and Propagation[J].Geophysics,2006,71(4):147-159.
[9]Xie X B,Jin S W,Wu R S.Wave-Equation-BasedSeismic Illumination Analysis[J].Geophysics,2006,71(5):169-177.
[10]Xie X B,Yang H.A Full-Wave Equation Based Sei-smic Illumination Analysis Method[C]//70th EAGEConference&Exhibition.Room:EuropeanAssociation of Geoscientist&Engineers,2008:284-288.
[11]Mao J,Wu R S,Gao J H.Directional IlluminationAnalysis Using the Local Exponential Frame[J].Geophysics,2010,75(4):163-174.
[12]毛剑,吴如山,高静怀,等.局部指数标架小波束在复杂介质方向照明分析中的应用[J].地球物理学报,2010,53(12):2955-2963.Mao Jian,Wu Rushan,Gao Jinghuai,et al.Directional Illumination Analysis for ComplexMedium Using Local Exponential Frame Beamlet[J].Chinese Journal of Geophysics,2010,53(12):2955-2963.
[13]张辉,王成祥,张剑锋.基于单程波方程的角度域照明分析[J].地球物理学报,2009,52(6):1606-1614.Zhang Hui,Wang Chengxiang,Zhang Jianfeng.One-Way Wave Equation Based Illumination Analysis inAngle Domain[J].Chinese Journal of Geophysics,2009,52(6):1606-1614.
[14]王祥春,刘学伟.起伏地表二维声波方程地震波场模拟与分析[J].石油地球物理勘探,2007,42(3):268-276.Wang Xiangchun,Liu Xuewei.Simulation anAnaylsis of Seismic Wavefield on Relief Surface by 2DAcoustic Wave Equation[J].Oil GeophycialProspecting,2007,42(3):268-276.
[15]薛东川,王尚旭,焦淑静.起伏地表复杂介质波动方程有限元数值模拟方法[J].地球物理学进展,2007,22(2):522-529.Xue Dongchuan,Wang Shangxu,Jiao Shujing.WaveEquation Finite-Element Modeling Including RuggedTopography and Complicated Medium[J].Progressin Geophysics,2007,22(2):522-529.
[16]李博,刘红伟,刘国峰,等.地震叠前逆时偏移算法的CPU/GPU实施对策[J].地球物理学报,2010,53(12):2938-2943.Li Bo,Liu Hongwei,Liu Guofeng,et al.Computational Strategy of Seismic Pre-Stack ReverseTime Migration on CPU/GPU[J].Chinese Journal ofGeophysics,2010,53(12):2938-2943.
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