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为了能够在水平方向上传播更远的距离,井间地震震源辐射能量具有水平方向强的特性,这是井间地震资料大入射角反射波能量强的主要原因.为了研究井间地震震源方向特性对地震信号的影响,本文提出了圆形震源阵列模拟方法.基于声波方程的一阶应力一速度方程的交错网格有限差分算法,进行了均匀各向同性无限介质的直达波和反射波正演数值模拟.数值模拟结果表明,井间方向性震源辐射能量的方向特性影响了地震记录的能量分布,为进一步研究方向性震源的能量补偿提供了理论依据.
In order to be able to propagate farther in the horizontal direction, the radiation energy of the cross-well seismic source has the characteristics of strong horizontal direction, which is the main reason for the strong reflection energy of the large cross-section seismic data. In order to study the source directional characteristics In this paper, the circular seismic source array simulation method is proposed in this paper.Based on the staggered-grid finite difference method of first-order stress-velocity equation of acoustic wave equation, direct wave and reflected wave forward are carried out in an infinitely isotropic homogeneous medium Numerical simulation results show that directional characteristics of source radiation energy of interwell crossover directivity affect the energy distribution of seismic records, which provides a theoretical basis for further energy compensation of directional sources.