地震波双向照明的概念及计算方法
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摘要
根据WRW模型理论,从地震波传播的物理过程给出了双向照明的具体概念,基于该概念提出了计算地震波双向照明强度的基本思路(称为DUC双向照明方法).为了有效提高DUC双向照明方法的计算效率,又提出了DUC-DC双向照明方法,并将提出的上述方法与传统的双向照明计算方法从计算精度和计算效率等方面进行了对比.试验结果表明,本文提出的双程波DUC方法得到的双向照明结果与理论照明结果完全一致,从而证明了本文提出的双向照明概念的正确性.而单程波DUC DC计算方法大幅度提高了双向照明强度的计算效率.本文提出的双向照明计算方法不仅能考虑到检波器接收孔径问题,还能将地表不同位置检波器处接收能量不同这一因素纳入考虑范围.
According to the WRW theory,this paper presents a definition of bi-directional seismic illumination on the basis of the seismic wave propagation process.Based on the definition,a new quantitative bi-directional seismic illumination method,which is called "DUC bi-directional seismic illumination" in this paper,is proposed.In order to improve the computational efficiency of this new method,DUC-DC bi-directional seismic illumination method is proposed.In the numerical experiments,the computational accuracy and efficiency of these two new methods are discussed and compared with the traditional bi-directional seismic illumination method.The result shows that the two-way wave-equation-based DUC bi-directional illumination result is very close to the theoretical bi-directional illumination result,so the correction of the DUC bi-directional illumination method is verified.Furthermore,the DUC-DC bi-directional illumination method is also turned out to be a method with a higher computational efficiency.These new methods can take into account not only the geophones geometric positions but also the different energy from different receivers during the calculation of bi-directional seismic illumination.
According to the WRW theory,this paper presents a definition of bi-directional seismic illumination on the basis of the seismic wave propagation process.Based on the definition,a new quantitative bi-directional seismic illumination method,which is called "DUC bi-directional seismic illumination" in this paper,is proposed.In order to improve the computational efficiency of this new method,DUC-DC bi-directional seismic illumination method is proposed.In the numerical experiments,the computational accuracy and efficiency of these two new methods are discussed and compared with the traditional bi-directional seismic illumination method.The result shows that the two-way wave-equation-based DUC bi-directional illumination result is very close to the theoretical bi-directional illumination result,so the correction of the DUC bi-directional illumination method is verified.Furthermore,the DUC-DC bi-directional illumination method is also turned out to be a method with a higher computational efficiency.These new methods can take into account not only the geophones geometric positions but also the different energy from different receivers during the calculation of bi-directional seismic illumination.
引文
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[14]冯伟,吴如山,马在田.单向传播子的局部平面波分解以及在定向照明分析和目标特征成像中的应用.地球物理学进展,2007,22(1):171-178 Feng W,Wu R S,Ma Z T.Local plane wave decomposition of one-way propagator and the applications to directional illumination analysis and target-structure oriented imaging. Progress in Geophysics(in Chinese),2007,22(1):171- 178
[15]冯伟,吴如山,王华忠等.面向目标的小束源照明和成像.地球物理学进展,2006,21(3):802-808 Feng W,Wu R S,Wang H Z,et al.Target-oriented beam source illumination and imaging.Progress in Geophysics(in Chinese),2006,21(3):802-808
[16]Xie X B,Jin S W,Wu R S.Wave-equation-based seismic illumination analysis.Geophysics,2006,71(5):169-177
[17]陈生昌,马在田,吴如山.波动方程双程地下方向照明分析.同济大学学报(自然科学版),2007,35(5):682-684 Chen S C,Ma Z T,Wu R S.Two-way subsurface directional illumination analysis by wave equation.Journal of Tongji University(Natural Science)(in Chinese),2007,35(5): 682-684
[18]Li W W.Design of seismic geometry based on wave equation forward simulation.Oil Geophysical Prospecting,2008,43 (2):134-141
[2]Berkhout A J,Ongkiehong L,Volker A W F,et al. Comprehensive assessment of seismic acquisition geometries ??by focal beams-partⅠ:theoretical considerations.Geophysics, 2001,66(3):911
[3]Bear G,Lu C P,Willen D,et al.The construction of subsurface illumination and amplitude maps via ray tracing. The Leading Edge,2000,19(7):726
[4]Muerdter D,Ratcliff D.Understanding subsalt illumination through ray-tracing modeling,Part 1:Simple 2-D salt models.The Leading Edge,2001,20:578-594
[5]Muerdter D,Ratcliff D.Understanding subsalt illumination through ray-tracing modeling,Part 2:Dipping salt bodies, salt peaks,and nonreciprocity of subsalt amplitude response. The Leading Edge,2001,20:688-697
[6]Muerdter D,Ratcliff D.Understanding subsalt illumination through ray-tracing modeling,Part 3:Salt ridges and furrows,and the impact of acquisition orientation.The Leading Edge,2001,20:688-697
[7]Hoffmann J.Illumination,resolution,and image quality of PP and PS waves for survey planning.The Leading Edge, 2001,20(9):1008
[8]Wu R S,Chen L.Mapping directional illumination and acquisition-aperture efficacy by beamlet propagators. Expanded Abstracts of 72nd SEG Mtg.,2002.1352-1355
[9]Rickett J E.Illumination-based normalization for waveequation depth migration.Geophysics,2003,68(4):1371
[10]Wu R S,Luo M Q,Chen S C,et al.Acquisition aperture correction in angle domain and true-amplitude imaging for wave equation migration.Expanded Abstracts of 74th SEG Mtg.,2004.937-940
[11]冯伟.面向目标的地震波照明分析与偏移成像[博士论文].上海:同济大学海洋与地球科学学院,2003 Feng W.Target-oriented seismic wave illumination analysis and migration imaging[Ph.D.thesis](in Chinese). Shanghai:School of Marine & Earth Science,Tongji University, 2003
[12]Wu R S,Chen L,Xie X B.Directional illumination and ??acquisition dip-response.Expanded Abstract of 65~(th) Conference and Technical Exhibition,EAGE,2003.147
[13]冯伟,王华忠,吴如山等.面向目标控制照明的合成波源偏移.石油物探,2004,43(3):223-228 Feng W,Wang H Z,Wu R S,et al.The migration of synthetic waves for target-oriented controlled illumination. Geophysical Prospecting for Petroleum(in Chinese),2004, 43(3):223-228
[14]冯伟,吴如山,马在田.单向传播子的局部平面波分解以及在定向照明分析和目标特征成像中的应用.地球物理学进展,2007,22(1):171-178 Feng W,Wu R S,Ma Z T.Local plane wave decomposition of one-way propagator and the applications to directional illumination analysis and target-structure oriented imaging. Progress in Geophysics(in Chinese),2007,22(1):171- 178
[15]冯伟,吴如山,王华忠等.面向目标的小束源照明和成像.地球物理学进展,2006,21(3):802-808 Feng W,Wu R S,Wang H Z,et al.Target-oriented beam source illumination and imaging.Progress in Geophysics(in Chinese),2006,21(3):802-808
[16]Xie X B,Jin S W,Wu R S.Wave-equation-based seismic illumination analysis.Geophysics,2006,71(5):169-177
[17]陈生昌,马在田,吴如山.波动方程双程地下方向照明分析.同济大学学报(自然科学版),2007,35(5):682-684 Chen S C,Ma Z T,Wu R S.Two-way subsurface directional illumination analysis by wave equation.Journal of Tongji University(Natural Science)(in Chinese),2007,35(5): 682-684
[18]Li W W.Design of seismic geometry based on wave equation forward simulation.Oil Geophysical Prospecting,2008,43 (2):134-141
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