基于广义S 变换频散AVO 属性提取方法研究

实验模拟和理论研究均表明，流体充填介质常常导致地震波发生不同程度的频散和衰减，为利用地震波频散特征识别储层流体提供了依据。 为了更有效地识别储层流体，需要研究提高地震波频散属性计算精度与可靠性的方法。为此，首先调研了纵波与横波频散属性的提取方法，分析并对比了多种时频分析方法的优缺点，优选出能够根据实际地震信号的频率分布特征灵活调节时窗的广义 S 变换方法，并将其用于具体信号的分析与处理中，然后制作了相应的计算流程，最后利用该方法对 K71 断块实际地震资料进行计算，其结果与实钻结果吻合较好。

Abstraction of frequency-dependent AVO attributes based on generalized S transform

In recent years, laboratory and theoretical studies showed that fluid-media often leads to varying degrees of dispersion and attenuation of seismic waves, which provides a basis for identifying the reservoir fluid. In order to identify reservoir fluid more effectively, it is necessary to study to improve the accuracy and reliability of the seismic wave dispersion attributes. Firstly, the theory of the seismic wave dispersion attributes was summarized, the advantages and disadvantages of a variety of time-frequency analysis method were analyzed and compared, generalized S transform was optimized to process and analyze seismic data because it’s timewindow is flexibly adjusted according to the frequency distribution characteristics of seismic signals. Secondly, the corresponding calculation process was conducted. Finally, this method was applied in actual data calculation of K71 fault block, and the result is in good correspondence with actual drilling results.