基于广义S变换的动态滤波技术及应用

Dynamic Filter Technology Based on Generalized S Transform and Its Application

分频解释技术已广泛应用于地震资料综合解释流程中。以广义Stockwell变换时频谱为基础,提出了一种针对瞬时谱的动态滤波技术,该方法分别对各时刻瞬时谱进行频率域滤波,且各时刻滤波参数由该时刻瞬时谱动态决定。详细介绍了该方法的原理及实现流程;通过单道地震信号分析了动态滤波技术的优势;并结合实际工区和衰减梯度含油气性检测技术,对比了滤波前后检测的衰减异常,得出利用动态滤波方法处理后的地震数据能够更准确的检测气藏的衰减异常,更符合工区实际情况,证实了该方法的可行性和实用性。动态滤波方法为地震信号分频处理提出了一种新思路。

Frequency-division interpretation technique has been widely used in comprehensive seismic interpretation.Based on the time-frequency spectrum of generalized S-transform,a dynamic filtering method for instantaneous spectrum is presented.In this method,the instantaneous spectrum of each moment is filtered in the frequency domain,and the filtering parameters are dynamically determined by the instantaneous spectrum of the moment.The principle and implementation flow of this method are introduced in detail.Test on single-channel seismic signals verified the effectiveness of the dynamic filtering method.Combined with the decay gradient oil-bearing detection technique,the dynamic filtering was used in filed data,results showed that the seismic data after dynamic filtering can detect the attenuation anomaly of the gas reservoir more accurately,verifying the feasibility and practicality of the method.The dynamic filtering method proposes a new idea for the frequency division processing of seismic signals.