基于多重积分的低频补偿反演方法研究

南海深水区地震资料存在15 Hz以下低频能量较弱的特点,低频成分决定了波阻抗随深度增加的变化趋势,因此要获得该区准确的波阻抗反演结果,必须做好低频成分的补偿。目前,波阻抗低频成分主要是通过井阻抗低通滤波来补偿;但该方法具有局限性。井阻抗低频信息加入过多,会造成波阻抗横向模型化加重。基于此,提出了一种基于多重积分的低频补偿反演方法;并应用实际资料进行了验证。研究表明,该方法可有效解决低频能量较弱地震资料波阻抗反演的低频补偿问题。

The study method of low-frequency compensation inversion based on multiple integral

The seismic data in deep water area of the South China Sea has the characteristic of weak energy below 15Hz. The low-frequency component determined the variation trend of wave impedance increased with depth. In order to accurately recover the wave impedance curve, we must complete the low-frequency information compensation. At present, the low-frequency information of wave-impedance is mainly compensated through low pass filter of well impedance, but this method has limitations,which will cause the wave impedance modeling, if the low-frequency information of well impedance is added too much. In view of this, a method about low-frequency compensation inversion based on multiple integral is proposed in this paper, and it is demonstrated by processing actual data. The result shows that this method can effectively solve the problem of the low-frequency compensation of wave impedance inversion.