时-频分析在高分辨率层序地层学中的应用

APPLICATION OF TIME-FREQUENCY ANALYSIS TO HIGH RESOLUTION SEQUENCE STRATIGRAPHY

石万忠 李举子 李梦溪 胡小强 陈新军

Shi Wanzhong Li Juzi Li Mengxi Hu Xiaoqiang Chen Xinjun

时频分析方法是利用小波变换原理,从地震波的时间域和频率域同时对其作出分析.小波变换具有随信号频率升高时间分辨率也提高的特点.这一特点恰好满足对具有多刻度特征信号进行时频分析定位的要求.经实验发现,沉积旋回与主极值频率之间有较好的对应关系:正旋回沉积对应的主极值频率从下到上由高频变为低频;反旋回沉积正相反.利用这一对应关系可进行层序地层划分和生储盖组合的预测.时频分析是在层序地层格架中预测生储盖组合,可有效保证预测的准确性.而时频分析法研究的对象是对应沉积旋回的频率变化,因此,还可用来判识砂体的性质.

Time frequency analysis method is used to analyze the time domain and frequency domain of seismic waves at the same time according to the principle of wavelet transformation.The time frequency of wavelet transformation increases with the increasing of signal frequency.This can satisfy well time frequency analysis of multi graduation characteristic signal.It has been proved by practice that sedimentary cycle possesses good correspondence with the main extremum frequence;the corresponding main extremum frequence of normal sedimentary cycle changes from high frequency to low frequency in ascending order;the anticycle sedimentation is opposite.This correspondece could be used in sequence stratigraphic division and source reservoir cap rock assemblage prediction,and also in the recognition of sand body property.

10.11743/ogg20010309