整体波场延拓法基准面校正与常规方法对比

消除近地表对地震波场所造成的影响，常规的解决方法是静校正和波动方程基准面校正。当勘探区域近地表出现较大的地形起伏或速度横向变化时，波动方程基准面校正则成为唯一有效的选择。传统波动方程基准面校正在实现过程中需要在双域对炮点、检波点分别进行延拓成像。为此，作者曾提出一种新的近地表问题解决方法——整体波场延拓法基准面校正(WEDD)。本文对WEDD方法和常规基准面校正方法在理论上进行了对比分析，并通过数值模拟讨论了各基准面校正方法的优缺点和适用范围。

A COMPARATIVE STUDY BETWEEN GLOBAL WAVEFIELD CONTINUATION AND ROUTINE METHODS FOR DATUM CORRECTION

Current schemes of removing near-surface effects on seismic data processing are mainly static corrections or wave-equation datuming (WED).In the presence of rough topography or strong lateral velocity variations in the near surface，the WED scheme is the only option available.However，the traditional procedure of WED requires to downward continue the sources and receivers in different domains，respectively.So the author has presented a new datuming method based on global wavefield continuation (WEDD).In this paper，the WEDD are compared with the traditional datuming methods firstly in theory，and then their advantages，disadvantages and the applicable scope are discussed.