摘要
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.
The theoretical analysis of frequency domain characteristics of seismic reflection was performed under the condition of gas-bearing and water-bearing reservoir with White model and pore elastic medium wave theory for tight sandstone reservoir of different saturation.In addition,the amplitude of the response and phase variation by the frequency had been summarized under different conditions of gas-bearing,waterbearing and oil-bearing reservoir through analysis of the above situation with finite difference numerical algorithm. The physical models of different saturation were built using natural sandstone,and analyzed by the method of physical testing.The result also showed that some saturated gas sandstone could have frequency dispersion effect on the seismic wave.In the gas-bearing reservoir, phase velocity of low frequency component changed greatly because of the frequency dispersion in low frequency.So amplitude anomaly occurred obviously in low frequency in the gas-bearing reservoir.But for high waterbearing reservoir, the amplitude had a smaller change relatively.The result had been applied in the geophysical technical research area of Tuha oilfield.It showed that the application effect was good,which effectively guided the reservoir prediction.
出处
《地球物理学进展》
CSCD
北大核心
2015年第6期2683-2689,共7页
Progress in Geophysics
基金
国家科技重大专项大型油气田及煤层气开发项目(2011ZX05007-06)和(2011ZX05004-003)联合资助
关键词
未固结储层
物理模拟
数值模拟
速度频散
低频异常
unconsolidated reservoir
physical modeling
numerical modeling
velocity dispersion
low frequency anomaly
