基于改进的广义S变换的低频吸收衰减梯度检测

摘要

In this paper, we take the advantage of high time-frequency resolution of the improved generalized S transform and use the time-frequency spectrum at low frequency to determine seismic attenuation gradient, then compare the result with the attenuation gradient based on conventional generalized S transform in order to get better oil and gas indication. The theoretical analysis, numerical simulation, and application of results show that the low-frequency absorption attenuation gradient based on improved generalized S transform and the high-frequency absorption attenuation gradient based on conventional generalized S transform can mutually support each other and better indicate the existence of oil and gas.%本文利用一种改进的广义S变换对地震波进行时频分解,求取地震波低频段时频谱的吸收衰减梯度,并与利用传统的广义S变换得到的高频段及低频段的吸收衰减梯度进行对比,以期更好地指示油气.理论推导、数值模拟及实际应用结果表明:基于改进的广义S变换的低频吸收衰减梯度可与传统的广义S变换得到的高频吸收衰减梯度相互佐证,更好指示油气.