基于Gabor变换的时频分析在气层识别中的应用

Application of Time-frequency Analysis Based on Gabor Transform in Gas Reservoir Identification

地震波在地层传播过程中能量发生衰减,且高频能量衰减强,低频能量衰减弱,尤其在含气储层中高频能量急剧衰减特征更为突出。借助于Gabor变换优良的时间域与频率域局部化特性,将基于Gabor变换的时频分析方法引入到地震波吸收衰减分析中,对南海莺歌海盆地某区块碎屑岩储层进行了油气预测,预测结果与实际钻井资料符合,证明了该方法的有效性和在油气预测中的应用前景。

The seismic energy was attenuated when the seismic wave propagated in the rock.Furthermore,the high frequency energy was strongly attenuated and the low frequency energy was attenuated weakly.Especially in gas-bearing reservoirs the high frequency energy was rapidly attenuated.Based on excellent localization property in time domain and frequency domain for Gabor transform,time-frequency analysis method based on Gabor transform was brought to seismic wave absorption and attenuation analysis for oil and gas prediction of the clastic reservoirs in certain block of the Yinggehai Basin in South China Sea.The related results are matched with actual drilling data,and it is proven that the method effective with good application prospects in oil and gas prediction.