复杂地表的单程波动方程地震叠前正演(英文)
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摘要
作者基于数学检波器和等时叠加原理,实现了复杂地表的单程波动方程地震叠前正演模拟。该方法采用虚拟的数学检波器接收地下的反射地震信号,灵活地将接收点布置在地表的任何地方,从而满足地表起伏的要求。此外,根据等时叠加原理, 该方法采用单程波动方程进行波场延拓和成像,计算简单快速。通过复杂正断层的数值模拟,得到了高信噪比的共炮集地震记录,并采用适用于起伏地形的深度偏移方法对该共炮集地震记录进行了叠前深度偏移,较好地实现了地震波的偏移归位,从而证明了这里提出的起伏地表的单程波动方程地震叠前正演方法是正确和有效的。
MathematicaI geophone (MG) and equal-time stacking (ETS) principles are used to implement seismic prestack forward modeling with irregular surfaces using the oneway acoustic wave-equation. This method receives seismic primary reflections from the subsurface using a set of virtual MGs. The receivers can be located anywhere on an irregular observing surface. Moreover, the ETS method utilizes the one-way acoustic wave equation to easily and quickly image and extrapolate seismic reflection data. The method is illustrated using high single-noise ratio common shot gathers computed by numerical forward modeling of two simple models, one with a flat surface and one with an irregular surface, and a complex normal fault model. A prestack depth migration method for irregular surface topography was used to reproduce the normal fault model with high accuracy.
MathematicaI geophone (MG) and equal-time stacking (ETS) principles are used to implement seismic prestack forward modeling with irregular surfaces using the oneway acoustic wave-equation. This method receives seismic primary reflections from the subsurface using a set of virtual MGs. The receivers can be located anywhere on an irregular observing surface. Moreover, the ETS method utilizes the one-way acoustic wave equation to easily and quickly image and extrapolate seismic reflection data. The method is illustrated using high single-noise ratio common shot gathers computed by numerical forward modeling of two simple models, one with a flat surface and one with an irregular surface, and a complex normal fault model. A prestack depth migration method for irregular surface topography was used to reproduce the normal fault model with high accuracy.
引文
Beasley, C., and Lynn, W., 1992, The zero-velocity layer: Migration from irregular surfaces: Geophysics, 57(11), 1435-1443.
Chu C., Ye F., and Gao J., 2005, Seismic modeling with a finite-difference method on irregular triangular grids: Periodical of Ocean University of China, 35(1), 43-48.
He Z., Wang C., Li J., He Q., and Gu X., 1989, Seismic reflection data migration and inversion: Chongqing Publishing House, China.
He Z., Xiong G., and Zhang Y., 1998, Nonzero offset seismic forward modeling by one-way acoustic wave-equation: 68th Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts., 1921-1924.
Hestholm, S., 2003, Elastic wave modeling with free surfaces: Stability of long simulations: Geophysics, 68(1), 314-321.
Reshef. M., 1991, Depth migration from irregular surfaces with depth extrapolation methods: Geophysics, 56(1), 119-122.
Chu C., Ye F., and Gao J., 2005, Seismic modeling with a finite-difference method on irregular triangular grids: Periodical of Ocean University of China, 35(1), 43-48.
He Z., Wang C., Li J., He Q., and Gu X., 1989, Seismic reflection data migration and inversion: Chongqing Publishing House, China.
He Z., Xiong G., and Zhang Y., 1998, Nonzero offset seismic forward modeling by one-way acoustic wave-equation: 68th Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts., 1921-1924.
Hestholm, S., 2003, Elastic wave modeling with free surfaces: Stability of long simulations: Geophysics, 68(1), 314-321.
Reshef. M., 1991, Depth migration from irregular surfaces with depth extrapolation methods: Geophysics, 56(1), 119-122.
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