复杂地表区波动方程基准面校正方法

Wave equation datum correction method for complex topography

在分析波动方程基准面校正原理的基础上,提出了'相移时移法'波场延拓算法,将相移算子分解为偏移算子、延拓算子和时移算子,并修改了Stolt公式,使得波动方程基准面校正能适应地表起伏剧烈、近地表速度纵横向变化剧烈的复杂地表条件。用编写的软件对复杂地表区的实际资料进行了试算,处理结果表明,用'相移-时移法'进行波动方程基准面校正能很好地消除起伏地表和复杂地表结构对数据的影响,为速度分析和同相叠加奠定良好的基础。

＂Phase-shift time-shift＂ arithmetic was proposed by analyzing principle of wave equation datum correction. Phase-shift operator is divided into migration operator, extrapolation operator and time-shift operator. Stolt formula is modified in this arithmetic. Then, wave equation datum correction can be used in complex topography such as rugged near-surface area and horizontal velocity varying acutely. Software was developed to process practical seismic data of complex topography. The results show that ＂phase-shift time-shift＂ arithmetic is effective. Wave equation datum correction can eliminate bad influence of rugged topography and complex near-surface structure. Thus, it can establish a good foundation for velocity analysis and in-phase stacking.