井中震源SVSP的一次波和各级多次波的分别计算

分别计算SVSP中的一次波和各级多次波，有助于在实际VSP资料上识别和研究一次波和各级多次波。文中将Wyatt计算一次波和各级多次波的方法加以改进，使之适用于震源在任意的深度。该方法首先要分别计算出震源向上激发和向下激发子波所产生的一次波和各级多次波，然后把相应级次的波再进行叠加，即可得到井中震源SVSP的一次波和各级多次波。理论试算表明，该方法是行之有效的。

Calculation of primary and multiple reflections in downhole-source SVSP data

The calculation of primary and various multiple reflections in downhole-source SVSP data favours the identification and study of these reflections in real VSP data.Wyatt method for calculating primary and multiple reflections is improved so that it is applicable to any source-depth case.The improved method finishes the calculation in two steps:(1)calculating the primary and multiple reflections produced respectively by source-generated upgoing and downgoing wavelets,and (2)stacking the corresponding reflections to obtain the primary and multiple reflections in downhole-source SVSP data.Theoretical calcula- tion proves this method feasible.