利用地震资料时频特征分析沉积旋回

Using time-frequency characteristics to analyze sedimentary cycle

地震资料中蕴含了丰富的地下沉积体信息,采用小波变换时频分析技术可以使一维的时间域地震波信号拓展到二维的时间-频率域,从而在频谱图中更清楚地刻画沉积体内部的旋回结构特征。通过建立不同类型的沉积模型,分析了进积、退积、加积沉积环境下,沉积体对应地震信号时频图中的变化规律。实际资料验证表明,时频图中能量团移动方向与岩石物性变化趋势一致。该方法为无钻井地区分析沉积旋回特征提供了一种新的思路和途径。

Seismic data contain abundant information on underground sedimentary body. Using wavelet transform timefrequency analysis can allow one-dimensional time domain signal expand to two-dimensional seismic wave time-frequency domain, and then the spectrum can more clearly depict the sedimentary cycle structure of the internal body. establishment of different types of sedimentary models, the change Through the law of the sedimentary body corresponding to seismic signal in the time-frequency map in progradation, aggradation and retrogradation sedimentary environment is analyzed. The actual data show that the energy group moving direction in the time-frequency map is consistent with petrophysics variation. This method provides a new way of thinking and approach in studying sedimentary cycle in non-drilling area.