【摘要】 等时面是地震波时间场的等值面,是Kirchhoff型数值模拟及Kirchhoff型偏移与反偏移的数据叠加或数据分布曲面,其几何形状和局部曲率对于Kirchhoff型真振幅偏移和反偏移中的加权函数计算和成像效果具有重要的影响。本文推导了均匀和梯度介质中的等时线公式并计算了二维均匀和梯度介质中等时线的几何特征。更多还原

【Abstract】 Isochrones are the isochronal surfaces of the time field of seismic waves.They are stacking and distribution surfaces in Kirchhoff—type modeling and migration as well as in Kirchhoff—type demigration.Their shape and curvature have significant influence on the computation of the weighting functions in Kirchhoff—type true—amplitude migration and demigration,and on the imaging results as well.In this paper we derive the formulas for the isochrones in homogeneous and gradient media,and give some numerical results on the geometrical features of isochrones.更多还原