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在传统时频分析方法的基础上 ,根据小波变换理论提出了利用小波变换对地震剖面进行三维时频分析的方法。首先将二维地震剖面变换成x t f三维数据体 ,根据振动能量在一定时间内沿频率方向作定向变化的特性来确定沉积旋回的类型。利用f t切片划分沉积旋回 ,在一定频率范围内改变滤波档可以得到具有某种稳定性的剖面 ,利用这些剖面可以识别旋回之间的界限。再以此为基础 ,利用x t切片进行层序界面的追踪和构造断层的拾取。利用小波三维时频分析方法划分的沉积旋回和物性变化规律可以进行层序界面追踪 ,并进一步确定储层范围。这种方法为三维地震资料进行多维时频分析奠定基础。
Based on the traditional time-frequency analysis method, the method of three-dimensional time-frequency analysis of seismic sections by wavelet transform is proposed based on wavelet transform theory. Firstly, the two-dimensional seismic profile is transformed into the x t f three-dimensional data body, and the type of sedimentary cycle is determined according to the characteristics that the vibration energy changes in the frequency direction within a certain period of time. Using f t slices to divide the sedimentary cycles, changing the filter profile over a range of frequencies gives profiles of some stability that can be used to identify the boundaries between cycles. Based on this, we use the x t slice to track the sequence boundary and pick the fault. The sedimentary cycle and the physical property variation rule by wavelet three-dimensional time-frequency analysis method can trace the sequence boundary and further determine the reservoir range. This method lays the foundation for multi-dimensional time-frequency analysis of 3D seismic data.