基于平面波照明的偏移成像补偿

Migration compensation with plane wave illumination

受地下复杂构造和地震数据采集系统的影响,地震波对地下目标的照明出现不均匀,在地震数据的偏移成像中出现成像阴影.根据地震数据最小二乘偏移/反演理论,和把地震波场照明结果作为最小二乘偏移/反演中的Hessian矩阵的近似对偏移成像进行补偿的原理,提出一种应用平面波照明结果对平面波偏移成像结果进行补偿以消除偏移成像阴影的方法.这种基于平面波照明的偏移成像补偿方法相对于局部角度域的照明偏移成像补偿方法具有计算效率上的优势.

Due to the effects of complicated subsurface structures and seismic acquisition system limitations, the seismic wave illumination to some subsurface targets may be inhomogenous, hence the migrated image on these targets will show some migration shadows. Based on the leastsquare migration/inversion theory of seismic data, and employing the illumination result of seismic wavefield as the approximation of the Hessian matrix in the least-square migration/ inversion for the compensation to the migration imaging, an illumination compensation method for wave equation migration shadow is proposed by applying the plane wave illumination to the plane wave migration. This plane wave migration compensation method has the advantage of computational efficiency over the migration compensation method in the local angle domain of image space.