井间地震方向性震源模拟方法
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摘要
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 propagate in longer distance,the crosshole seismic sources have a unique directional characteristic in horizontal direction.This results in the dominant reason why there are reflected wave of bigger incidence angle in the crosshole seismic data.A circle source array is present to study the influence of seismic signal from the crosshole seismic source in this paper.Based on staggered-grid finite difference method of one order stress-velocity elastic wave equation,the numerical modeling of direct wave and reflected wave is implemented in isotropic media.The result analysis shows that the directional characteristic of source effects the distribution of energy in cross-hole seismic data.It lays a foundation for the research on amplitude compensation by the directional source in borehole seismic.
引文
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