【摘要】 以东濮凹陷南部兰聊断裂下降盘的白庙气田沙三段砂砾岩水下扇体为例,根据优选出的气层、水层和干层在测井资料和地震属性分析中的响应特征,通过反复试验,选取合理的时窗值及子波同态谱(Cepstral谱),采用基于模型的参量法估算地震波频谱衰减特征,开展地层含气性预测研究。结果表明,当时窗值选择100 ms,Cepstral延迟值为10时,地震波形稳定,而且分辨率高,含气砂体在地震中出现中高频衰减现象。与实钻成果对比发现,反演预测与钻井吻合率为82.4%。更多还原

【Abstract】 Based on the responses of optimized gas zone,water zone and dry znoe in logging data and seismic attributes,gas-bearing detection on the glutenite subaqueous fan in the third section of Shahejie Formation in Baimiao Gas Field,which is located in the footwall of Lanliao Fault Zone,Dongpu Depression,is carried out through the selection of appropriate time-window length and wavelet spectra(Cepstral spectra) after experiments and through using the parameter method based on a model to estimate the characteristics of seismic frequency spectrum attenuation.The study results show that the seismic wave is stable and indicates a high resolution,and that the high frequency attenuation presents in seismic operation for gas-bearing sandbody,when the time-window length is 100 ms and the lag of Cepstral spectrum is 10.Meanwhile,the results also show that the agreement rate of inversion prediction and drilling is 82.4% according to the drilled wells.更多还原