一种新的相位编码面炮记录叠前深度偏移方法

A new method for prestack depth migration of areal shot records with phase encoding

提出一种新的面炮记录相位编码叠前深度偏移方法.理论上证明了把相位编码的震源作为面积震源,可减少面炮记录合成的数量,是一种更有效的叠前深度偏移计算方法.运用声波方程解的性质,分析合成算子,可把面炮记录偏移的平面波震源推广为非平面波震源,缩短了面炮记录长度,从而提高了相位编码面炮记录偏移的效率.

A new method for the prestack depth migration of the areal shot records with phase encoding is presented. It is proved theoretically that the areal source with phase encoding as areal shots is a more effective computational scheme of the prestack depth migration. It can computationally decrease the quantity of the areal shot record synthesized. The synthetical operator is analyzed by using the properties of wave equation solution. The plane wave source is naturally generalized to nonplane wave source which causes the length of areal shot record to be shortened. Therefore, the computational efficiency of the areal shot prestack depth migration with phase encoding is enhanced.