整体波场延拓法基准面校正

DATUM CORRECTION BASED ON GLOBAL WAVEFIELD CONTINUATION

提出了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)。借助地震理论中的互换原理和观测面沉降概念,在基准面校正过程中将炮点和检波点的处理统一起来,并利用炮点-全偏移距域双平方根算子实现波场的单域整体延拓,最后提取目标深度的波场值完成参考面的重新定义。模型试算结果表明了WEDD方法的有效性。

In this paper,a new solution to the near-surface problem-the datum correcting method based on the global wavefield continuation is presented.According to the mutual exchange principle of the earthquake theory and the observed surface settlement concept,the treatment of shotpoint and geophone station will be combined during the datum correcting process.The global continuation of the single wavefield will be achieved by the double square root operator in shotpoint-offset domain.At last,the wavefield vale of the target depth is extracted and the reference surface is redefined.The trial calculated results show that the datum correction based on global wavefield continuation is effective.