VTI介质三分量井间地震观测波场数值模拟
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摘要
文中采用波动方程交错网格有限差分数值方法模拟井间三分量地震观测到的各向异性介质中传播的波场。与只用两分量地震资料模拟相比,两分量X和Z分量剖面上只能观测到快纵波和慢纵波,观测不到Y方向偏振的快横波,也观测不到横波分裂现象,在三分量地震资料模拟中,可以在Y分量地震记录上观测到快横波和横波分裂。一般来说,在TI介质中横波速度各向异性要比纵波速度各向异性具有更明显的特征。通过对大庆油田S区野外实际观测到的井间三分量地震数据进行数值模拟,证实了快横波的存在,合理地解释了井间地震记录的各向异性介质中传播的波场,为纵、横波波场分离,纵横波速度分析、成像和纵横、波综合解释等提供了基本依据。
The paper uses staggering grid finite-difference numeric algorithm of wave equation to simulate the propagation wavefield surveyed by 3-Component cross-hole seismic method in VTI media.In comparison with the simulating the 2-Component seismic data,the surveyed result has neither polarized fast S-wave in Y-direction nor S-wave splitting phenomenon,only has fast and slow P-wave on X and Z component sections;and in simulation of 3-Component seismic data,the fast S-wave and S-wave splitting can be surveyed on Y-Component seismic record.Generally,the anisotropy of S-wave velocity has more distinctive feature than that of P-wave velocity in TI(transverse isotropy)media.The numeric simulation is carried out for 3-Component cross-hole seismic data practically surveyed in the S area of Daqing Oilfield,which proved the existence of fast S-wave,reasonably interpreted the wavefield propagating in VTI media on the 3-Component cross-hole seismic records,and provided basis for separation of P-wave from S-wave wavefields,analysis of P-and S-wave velocity,imaging and integrative interpretation of P-and S-waves.
The paper uses staggering grid finite-difference numeric algorithm of wave equation to simulate the propagation wavefield surveyed by 3-Component cross-hole seismic method in VTI media.In comparison with the simulating the 2-Component seismic data,the surveyed result has neither polarized fast S-wave in Y-direction nor S-wave splitting phenomenon,only has fast and slow P-wave on X and Z component sections;and in simulation of 3-Component seismic data,the fast S-wave and S-wave splitting can be surveyed on Y-Component seismic record.Generally,the anisotropy of S-wave velocity has more distinctive feature than that of P-wave velocity in TI(transverse isotropy)media.The numeric simulation is carried out for 3-Component cross-hole seismic data practically surveyed in the S area of Daqing Oilfield,which proved the existence of fast S-wave,reasonably interpreted the wavefield propagating in VTI media on the 3-Component cross-hole seismic records,and provided basis for separation of P-wave from S-wave wavefields,analysis of P-and S-wave velocity,imaging and integrative interpretation of P-and S-waves.
引文
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[3]何惺华.井间地震资料中的横波信息.石油物探,2003,42(3):374～378
[4]何惺华.井间地震资料中的反射波分析.油气地球物理,2005,3(4):1～8
[5]孔庆丰.井间地震波场数值模拟技术研究与应用.勘探地球物理进展,2006,29(5):333～336
[6]宋常瑜,裴正林.井间地震粘弹性波场特征的数值模拟研究.石油物探,2006,45(5):508～513
[7]杜世通.井间地震观测数据模拟和偏移的有限单元法.油气地球物理,2004,2(4):78～82
[8]侯安宁,何樵登.各向异性介质中弹性波动高阶差分法及其稳定性的研究.地球物理学报,1995,38(2):243～251
[9]董良国,马在田,曹景忠等.一阶弹性波方程交错网格高阶差分解法.地球物理学报,2000,43(3):411～419
[10]董良国,马在田,曹景忠.一阶弹性波方程交错网格高阶差分解法稳定性研究.地球物理学报,2000,43(6):856～864
[11]张文波.井间地震交错网格高阶差分数值模拟及逆时偏移成像研究.长安大学博士毕业论文,2005
[12]杜世通.地震波动力学.山东东营:石油大学出版社,2003
[13]Thomsen L.Weak elastic anisotropy.Geophysics.1986,51(10):1954～1966
[2]杜光升,叶夏根,乔文孝.井间声波场有限差分模拟.声学技术,2000(3):156～157
[3]何惺华.井间地震资料中的横波信息.石油物探,2003,42(3):374～378
[4]何惺华.井间地震资料中的反射波分析.油气地球物理,2005,3(4):1～8
[5]孔庆丰.井间地震波场数值模拟技术研究与应用.勘探地球物理进展,2006,29(5):333～336
[6]宋常瑜,裴正林.井间地震粘弹性波场特征的数值模拟研究.石油物探,2006,45(5):508～513
[7]杜世通.井间地震观测数据模拟和偏移的有限单元法.油气地球物理,2004,2(4):78～82
[8]侯安宁,何樵登.各向异性介质中弹性波动高阶差分法及其稳定性的研究.地球物理学报,1995,38(2):243～251
[9]董良国,马在田,曹景忠等.一阶弹性波方程交错网格高阶差分解法.地球物理学报,2000,43(3):411～419
[10]董良国,马在田,曹景忠.一阶弹性波方程交错网格高阶差分解法稳定性研究.地球物理学报,2000,43(6):856～864
[11]张文波.井间地震交错网格高阶差分数值模拟及逆时偏移成像研究.长安大学博士毕业论文,2005
[12]杜世通.地震波动力学.山东东营:石油大学出版社,2003
[13]Thomsen L.Weak elastic anisotropy.Geophysics.1986,51(10):1954～1966
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