Morlet小波分频处理在提高地震资料分辨率中的应用  

Application of Morlet wavelet frequency-division processing in enhancing the seismic data resolution.

作　　者：马朋善[1] 王继强[1] 刘来祥[2] 崔世凌[3] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油化工股份有限公司勘探开发研究院,北京100083 [3]中国石油化工股份有限公司胜利油田物探院,山东东营257100

出　　处：《石油物探》2007年第3期283-287,共5页Geophysical Prospecting For Petroleum

基　　金：国家973项目基金(2005CB221306);全国博士后管理协调委员会博士后基金(20060360576)资助。

摘　　要：利用常规方法对地震资料进行处理,其频带受原始地震资料频带的制约,通常不能满足精细储层预测和描述的需要,为此,提出了一种Morlet小波变换分析方法来提高地震资料的分辨率。该方法具有良好的时频局部化性质而优于传统的傅里叶分析方法。Morlet小波变换分析作为叠后地震资料分频方法更适应于地震频谱分析。首先利用Morlet小波变换建立恰当的小波滤波器组,然后对地震信号做相应频谱分析,分别对单道数据及实际资料进行处理,得到了不同尺度的地震资料,最后对处理结果进行了分频反演。最终结果表明,用Morlet小波变换分析处理后的地震资料,其品质得到了明显的改善,处理后的剖面同相轴变细,频带变宽,分辨率得到了提高。In traditional data processing,the frequency band was restrict- ed by original frequency band,which cannot satisfy the demand for fine reservoir description and prediction,Therefore,the Morlet wavelet transform method which is good in time-frequency localiza- tion was proposed to improve the resolution of seismic data,and as a poststack seismic data frequency-division method,it is more suit- able for seismic spectrum analysis.Firstly,the Morlet wavelet transform is utilized to eatablish a suitable wavelet filter bank. Then,a relevant spectrum analysis is made on seismic signals and the seismic data of different scales is obtained after processing a single trace data and actual data separately.Finally,the frequency- division inversion is made based on processing results.The uhi- mate result shows that the quality of seismic data has been greatly improved after the Morlet wavelet transform.After processing, the profiles have thinner event,wider frequency band,and higher resolution.

关 键 词：MORLET小波 傅里叶变换 分频处理 频宽 分辨率 

分 类 号：P631.4[天文地球—地质矿产勘探]