孔隙流体对岩石物理弹性参数的影响及敏感属性参数优选——以济阳坳陷为例

Influence on petrophysics elastic parameter by pore fluid and optimization of sensitive attribute parameter-case of Jiyang depression

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。

Based on lab test data of petrophysics in Jiyang depression, the influence on petrophysics elastic parameters by pore fluid is analyzed. The optimization method of sensitive attribute parameters to pore fluid is put forward from Gassmann theoretical model. The difference of petrophysics elastic parameters in pores filled gas, oil or water is studied by defined fluid indicate factor. The sensitive attribute parameters in different fluid state are optimized. The result indicates that the gas, oil and water state in rock of different cementation can be divided well by cross analysis between Poisson's ratio of sensitive attribute parameter and other attribute parameter. The oil and water state in different cementation rock can be identified well by cross analysis between elastic combined attribute and other sensitive attribute parameter.