频率域小波变换分频处理在川西地震勘探中的应用

基于频率域小波变换研究,在频率域构建了合适的小波滤波器,实现了一种对地震资料进行分频与重构处理的方法。地震合成信号的分频与重构实验表明,该方法能够有效区分不同频率的地震信号,具有较高的分辨率和精确度。针对川西坳陷深层须家河组致密碎屑岩天然气储层埋藏较深、地震资料主频低、分辨率十分有限的问题,应用频率域小波变换分频重构处理方法对该区的地震资料进行了处理,获取了不同频率段的三维地震数据,将其应用于井震标定、波阻抗反演和地震属性分析等方面,取得了理想的处理效果。

Application of frequency division processing on frequency-domain wavelet transform in deep Chuanxi Depression

Based on the research of wavelet transform in frequency domain,appropriate wavelet filters are built and a method for frequency division and reconfiguration processing on seismic data is proposed.Frequency division and reconfiguration experiments on seismic synthetic signal indicate that the method can effectively identify the signals with different frequency,and has higher resolution and accuracy.The tight clastic gas reservoir of deep Xujiahe Formation in Chuanxi Depression is characterized by deep buried depth,low dominant frequency and limited resolution of seismic data.Aiming at the problems in Chuanxi Depression,the above method was used in the seismic data processing.The processed 3D seismic data with different frequency range was applied on well-seismic calibration,wave impedance inversion and seismic attribute analysis,and good results were achieved.