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针对不同饱和度的致密砂岩储层,利用White模型,并结合孔隙弹性介质波动理论,对储层含气、含水情况下频率域地震反射特征进行了理论分析,并利用有限差分数值算法对上述情况进行了模拟分析,总结出了含气、含水及含油不同情况下响应的振幅和相位随频率变化的情况.利用天然砂岩建立不同饱和程度的物理模型,用物理测试的方法进行分析,结果同样显示了部分气饱和砂岩对地震波的频散的影响.在含气储层,低频段会由于频散的原因,使得低频分量相速度变化较大,从而引起含气储层低频段出现明显的振幅异常,而对于高含水情形则是相对弱振幅,利用得出的结论在吐哈油田物探攻关区块进行了应用,取得了较好的效果,有效的指导了储层的预测.
For the tight sandstone reservoirs with different saturations, using the White model, combined with the theory of pore elastic medium wave, the seismic reflection characteristics of the frequency domain in gas-bearing and water-bearing reservoirs are theoretically analyzed. The finite difference numerical algorithm The simulation results show that the amplitude and phase of the response vary with frequency under different conditions of gas, water and oil.Using natural sandstone to establish physical models with different degrees of saturation and analyze them by physical test, the results also show that The influence of partial gas-saturated sandstone on the seismic wave dispersion is discussed.In the gas-bearing reservoirs and low frequency bands, the phase velocities of low frequency components vary greatly due to the frequency dispersion, resulting in obvious amplitude anomalies in the low frequency band of gas-bearing reservoirs , Whereas for high water cut cases, it is a relatively weak amplitude. The conclusion obtained by using this method has been applied in the geophysical exploration block in Tuha Oilfield and has achieved good results and effectively guided reservoir prediction.