基于散射理论的外源干扰压制法研究

The Study Of Outsource Perturbation Suppression Method Based On Scattering Theory

外源干扰在地震道集上表现为符合时距双曲线规律的倒抛物线形状,与震源信号在频谱域内几乎完全重叠,且在其它特征方面无显著差异,因此,常规的噪音压制法无论在时间域或是在频率内都无法实现.本文提出的基于散射理论的外源干扰压制法,是运用观测系统计算和特定点信息,通过外源定位原理,求出外源干扰的位置,通过散射理论模拟任意位置的地震外源干扰信息,运用匹配相减法在地震记录上进行压制.通过在冀东油田新探区浅海地震资料处理中的应用,获取高保真和高信噪比的地震资料,证实该方法的准确可靠性.

The outsource perturbation has the shape of inverted time-distance hyperbolic law, their frequency spectrum is almost entirely overlap with which of seismic signal and is almost Consistent in other characteristics. Therefore,we can not use usual technologies to suppress the noise in time domain or frequency domain. Here, we introduce a new technology based on scattering theory, and compute the outsource position by its outsource positioning principle with observation systems and specific point information calculated. Then we simulate the signal of outsource perturbation by the scattering theory at any points and apply the matched subtraction to suppress the noise in the seismic data. The method is applied in the shallow seismic data processing of Jidong oilfield new exploration area and the high signal -noise ratio and high-fidelity seismic data is obtained, which confirm that the method has high accuracy and reliability.