【摘要】 由于含气砂岩的非均质性,地震波在经过含气砂岩时高频能量衰减强,低频能量衰减弱.从而在储层的下方可能出现低频强振幅的阴影区.因此,可用时频分析直接对储层的含气性进行检测.时频连续小波变换是对连续小波变换方法的改进.变换的结果是时频域,不需要尺度-频率的转换;且时频分辨率高.本文将它用于储层含气性检测.更多还原

【Abstract】 Because of the heterogeneity, when seismic propagates through gas-bearing sandstone, the high frequency will attenuate strongly while the low frequency attenuation is much weaker.Then, low-frequency shadow may occur below the gas reservoirs.Therefore, time-frequency analysis can be directly used to detect the gas in the reservoirs. Time-frequency continuous wavelet transform (TFCWT) is a new time-frequency analysis method which comes from the improvement of continuous wavelet transform (CWT).Its domain is directly time-frequency and its resolution is much higher than CWT.In this paper, TFCWT is directly used to detect the gas in the reservoirs.更多还原