波动方程偏移成像阴影的照明补偿

Illumination compensation for wave equation migration shadow

受地下复杂构造和地震数据采集系统的影响,使地震波对地下目标的照明出现不均匀性,地震采集系统难以有效地获取地下某些目标的反射信息,进而使数据偏移成像在这些目标体上出现成像阴影.根据波场和Green函数的窗口Fourier框架展开,利用角度域波动方程偏移成像和波动方程照明分析,并结合波动方程反演理论,提出一种角度域波动方程偏移成像阴影照明补偿方法.这种补偿方法能同时考虑地震数据采集系统和波场传播路径对偏移成像的影响,消除复杂构造区的偏移成像阴影,改进波动方程叠前深度偏移成像在复杂构造区的成像效果.

Due to the effects of complicated subsurface structures and seismic acquisition systems, the seismic wave illumination to some subsurface targets may be inhomogenous, so the seismic acquisition system can not effectively acquire the reflected information from these targets, and migrated some migration shadows. Based on the windowed Fourier frame expansion illumination compensation method for wave equation migration shadow is images of these targets will have wavefield and Green function, an proposed by using the wave equation migration and illumination analysis in angle domain and combining the wave equation inverse theory. The compensation method can take account into the effects of the seismic acquisition system and wave propagation path, remove the migration shadow on the complicated subsurface structures, and improve the results of wave equation prestack depth migration in complex structure regions.