VTI介质中P-SV波转换点与各向异性参数关系
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摘要
对于转换波地震勘探中的转换点位置这个重要问题,提出转换点位置不仅与纵横波速度比,偏移距深度比以及源检距有关,还与地下介质的各向异性的性质有关,计算了忽略地下介质的各向异性影响对转换点的确定带来的严重误差,从而影响地下地质体的精确成像.通过对层状VTI介质中的转换点近似方程的推导过程,引入该方程不同于传统方程的导出是对层状各向同性介质而言,该方程通过引入各向异性参数,使我们对转换波可以有进一步的认识,拓展了转换波处理中各向异性的应用.该方程对于偏移距深度比小于3.0的情况是比较准确的,这对于大偏移距转换波勘探具有实际意义.
The paper shows anisotropy effect on the conversion position and evaluate the error introduced in data processing due to neglecting anisotropy.It is demonstrated that the location of the conversion point depends strongly on elastic properties of the media.The paper introduces also the improved equations for calculating the conversion point of the P-SV converted wave(C-wave) in VTI media.The introduced equations for the conversion point are valid for offset about three-times the reflector depth.The equation reveal some addition analytical insights into the converted wave properties.
The paper shows anisotropy effect on the conversion position and evaluate the error introduced in data processing due to neglecting anisotropy.It is demonstrated that the location of the conversion point depends strongly on elastic properties of the media.The paper introduces also the improved equations for calculating the conversion point of the P-SV converted wave(C-wave) in VTI media.The introduced equations for the conversion point are valid for offset about three-times the reflector depth.The equation reveal some addition analytical insights into the converted wave properties.
引文
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[7]Li Y.Converted-wave moveout and conversion-point equationsin layered VTI media:theory and applications[J].Journal ofApplied Geophysics,2003,54:297~318.
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[12]郑海山,张中杰,田小波.VTI介质中非线性对地震波频率和频宽变化的约束[J].地球物理学报,2006,49(3):885~894.Zheng H S,Zhang Z J,Tian X B.Constraints of the nonlin-earity in VTI media on seismic wave frequency and bandwidthchanges[J].Chinese J.Geophys.(in Chinese),2006,49(3):885~894.
[13]刘恩儒,岳建华,潘冬明.地震各向异性——多组裂隙对横波偏振的影响[J].地球物理学报,2006,49(5):1401~1409.Liu E R,Yue J H,Pan D M.Frequency-dependent anisotro-py:Effects of multiple fracture sets on shear-wave polariza-tions[J].Chinese J.Geophys.(in Chinese),2006,49(5):1401~1409.
[14]魏建新,狄帮让,王椿镛.各向异性介质中扭转波分裂的初步实验观测[J].地球物理学报,2006,49(6):1755~1761.Wei J X,Di B R,Wang C Y.Experiment observation of tor-sion wave splitting in anisotropic medium[J].Chinese J.Geophys.(in Chinese),2006,49(6):1755~1761.
[15]赵爱华,张美根,丁志峰.横向各向同性介质中地震波走时模拟[J].地球物理学报,2006,49(6):1762~1769.Zhao A H,Zhang M G,Ding Z F.Seismic traveltime compu-tation for transversely isotropic media[J].Chinese J.Geo-phys.(in Chinese),2006,49(6):1762~1769.
[16]尤建军,常旭,刘伊克.VTI介质长偏移距非双曲动校正公式优化[J].地球物理学报,2006,49(6):1770~1778.You J J,Chang X,Liu Y K.Optimization of nonhyperbolicmoveout correction equation of long-offset seismic data inVTI media[J].Chinese J.Geophys.(in Chinese),2006,49(6):1770~1778.
[17]阮爱国,李家彪,初凤友,李湘云.海底天然气水合物层界面反射AVO数值模拟[J].地球物理学报,2006,49(6):1826~1835.Ruan A G,Li J B,Chu F Y,Li X Y.AVO numerical simu-lation of gas hydrates reflectors beneath seafloor[J].ChineseJ.Geophys.(in Chinese),2006,49(6):1826~1835.
[2]Fredy A V Artola,P-S converyed Wave:Conversion point andzero-offset energy in anisotropic media[J].Journal of AppliedGeophysics,2004,56:155~163.
[3]Druzhinin A,Ray-Kirchhoff multicomponent borehole seismicmodeling in 3D heterogeneous,anisotropic media[J].Journalof Applied Geophysics,2004,55:225~238.
[4]黄中玉.多分量地震勘探的机遇和挑战[J].石油物探,2001,40(3):131~137.
[5]何汉漪.二十一世纪的地震勘探技术[J].地学前缘,2000,7(3).
[6]董敏煌.多波多分量地震勘探[M].北京:石油工业出版社,2002.
[7]Li Y.Converted-wave moveout and conversion-point equationsin layered VTI media:theory and applications[J].Journal ofApplied Geophysics,2003,54:297~318.
[8]郝重涛,姚陈.任意空间取向TI介质中体波速度特征[J].地球物理学报,2007,50(2):546~555.Hao C T,Yao C.Analysis of body-wave velocity characteris-tic for TI medium with arbitrary spatial orientation[J].Chi-nese J.Geophys.(in Chinese),2007,50(2):546~555.
[9]赵海波,王秀明,王东,陈浩.完全匹配层吸收边界在孔隙介质弹性波模拟中的应用[J].地球物理学报,2007,50(2):581~591.ZHAO Hai-Bo,WANG Xiu-Ming,WANG Dong,CHENHao.Applications of the boundary absorption using a perfect-ly matched layer for elastic wave simulation in poroelasticmedia[J].Chinese J.Geophys.(in Chinese),2007,50(2):581~591.
[10]刘恩儒,岳建华,刘彦.具有离散裂缝空间分布的二维固体中地震波传播的有限差分模拟[J].地球物理学报,2006,49(1):180~188.Liu E E,Yue J H,Liu Y.Finite difference simulation ofseismic wave propagation in 2-D solids with spatial distribu-tion of discrete fractures[J].Chinese J.Geophys.(in Chi-nese),2006,49(1):180~188.
[11]王德利,何樵登,韩立国.单斜介质中方位NMO速度Thomsen参数反演方法研究[J].地球物理学报,2006,49(1):249~255.Wang D L,He Q D,Han L G.Thomsen parameter inversionwith azimuthal NMO velocity in monoclinic media[J].Chi-nese J.Geophys.(in Chinese),2006,49(1):249~255.
[12]郑海山,张中杰,田小波.VTI介质中非线性对地震波频率和频宽变化的约束[J].地球物理学报,2006,49(3):885~894.Zheng H S,Zhang Z J,Tian X B.Constraints of the nonlin-earity in VTI media on seismic wave frequency and bandwidthchanges[J].Chinese J.Geophys.(in Chinese),2006,49(3):885~894.
[13]刘恩儒,岳建华,潘冬明.地震各向异性——多组裂隙对横波偏振的影响[J].地球物理学报,2006,49(5):1401~1409.Liu E R,Yue J H,Pan D M.Frequency-dependent anisotro-py:Effects of multiple fracture sets on shear-wave polariza-tions[J].Chinese J.Geophys.(in Chinese),2006,49(5):1401~1409.
[14]魏建新,狄帮让,王椿镛.各向异性介质中扭转波分裂的初步实验观测[J].地球物理学报,2006,49(6):1755~1761.Wei J X,Di B R,Wang C Y.Experiment observation of tor-sion wave splitting in anisotropic medium[J].Chinese J.Geophys.(in Chinese),2006,49(6):1755~1761.
[15]赵爱华,张美根,丁志峰.横向各向同性介质中地震波走时模拟[J].地球物理学报,2006,49(6):1762~1769.Zhao A H,Zhang M G,Ding Z F.Seismic traveltime compu-tation for transversely isotropic media[J].Chinese J.Geo-phys.(in Chinese),2006,49(6):1762~1769.
[16]尤建军,常旭,刘伊克.VTI介质长偏移距非双曲动校正公式优化[J].地球物理学报,2006,49(6):1770~1778.You J J,Chang X,Liu Y K.Optimization of nonhyperbolicmoveout correction equation of long-offset seismic data inVTI media[J].Chinese J.Geophys.(in Chinese),2006,49(6):1770~1778.
[17]阮爱国,李家彪,初凤友,李湘云.海底天然气水合物层界面反射AVO数值模拟[J].地球物理学报,2006,49(6):1826~1835.Ruan A G,Li J B,Chu F Y,Li X Y.AVO numerical simu-lation of gas hydrates reflectors beneath seafloor[J].ChineseJ.Geophys.(in Chinese),2006,49(6):1826~1835.
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