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针对济阳坳陷实验室岩石物理测试数据,分析了孔隙流体对岩石物理弹性参数的影响。基于Gassmann理论模型,提出了孔隙流体敏感属性参数的优选方法。通过所定义的流体指示因子,研究了岩石物理弹性参数在孔隙含气与饱和油、饱和水时的区别,优选了不同流体状态下的敏感属性参数。孔隙流体对速度的影响与岩石的分选和结构等有关。随着含油饱和度增大,速度均有减小的趋势,但不同类别岩性减小的趋势不同,岩石的致密程度越高,速度随含油饱和度变化的趋势越小。通过敏感弹性参数泊松比与其他弹性参数之间的交会分析能够较好地区分不同胶结状态岩石的气体和油、水状态,通过弹性组合参数与其他敏感弹性参数的交会分析能够较好地识别不同胶结状态岩石的饱和油、饱和水状态。
According to the laboratory petrophysical test data in Jiyang Depression, the influence of pore fluid on the rock physics elastic parameters is analyzed. Based on the Gassmann theory model, the preferred method of pore fluid sensitive property parameters is proposed. Through the definition of the fluid indicator, the difference between the petrophysical parameters of the rock and the saturated oil and saturated oil in porous media was studied, and the sensitive attribute parameters in different fluid states were optimized. The effect of pore fluid on velocity is related to rock sorting and structure. With the increase of oil saturation, the velocities all decreased, but the trends of decreasing lithology of different categories were different. The higher the density of rocks, the smaller the trend of velocity with oil saturation. Through the intersection analysis of Poisson ’s ratio and other elastic parameters, the gas and oil and water states in different cemented rocks can be well distinguished, and the intersection analysis of elastic composite parameters and other sensitive elastic parameters can be well identified Different cemented rock saturated oil, saturated water state.