基于同步挤压变换的频率衰减梯度在储层预测中的应用

摘要

针对利用频率衰减属性对地震资料进行解释时受制于时频分析方法分辨率的问题,对提高时频分析方法分辨率进行了研究.小波变换受到不确定性原理的制约,分辨率受到一定的限制.采用同步挤压变换,通过对信号进行复小波变换,并重排小波系数谱,得到了更高的分辨率,并在理论上保持了完整的可逆性.通过对重排之后的系数谱提取频率衰减梯度并加以分析,利用衰减梯度属性对储层进行预测,进一步提高了储层预测的精度,降低了储层流体检测的多解性,可为高分辨率的地震勘探提供一种新思路.%In order to solve the problem of which the attennuation gradient property is impacted by low resolution of time-frequency analysis when interpreting the seismic data,the author studied the method of improving the resolution of time-frequency analysis method.The resolution of time-frequency is negative affected by Heisenberg uncertainty principle.The synchrosqueezing transform obtains a new time-frequency spectrum by re-arranging the complex wavelet coefficients of the signal in the vicinity of the real frequency.Compared with the complex wavelet transform,it has higher time-frequency resolution and maintains the complete mathematical reversibility in theory.And the attenuation gradient property based on spectrum analysis technique can effectively utilize the time-frequency high-resolution characteristic of the synchrosqueezing transform to predict the position and range of the reservoir more accurately,and even greatly reduces the multisolution of reservior fluid decection,provides a good idea for high resolution seismic exploration.