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储层流体研究对于地震勘探有着十分重要的意义。本文利用经典的Boit-Gassmann方程,在孔隙度不同的条件下,通过对目的层进行不同成分的流体替代,研究了孔隙度、饱和度以及流体成分对等效岩石的纵横波速度、密度等参数的影响,并对计算结果的变化规律进行分析。通过改变目标层的厚度以及充填流体的成分,正演并分析AVO地震响应,建立岩石流体性质和地震响应特征的对应关系。结果表明,气的存在对岩石物性的影响较大,当目标层充填的流体由气变油和水时,目标层的地震响应的AVO现象变得不明显,并且随着目标层厚度的逐渐减少,地震响应符合调谐效应。
Reservoir fluid research is of great significance to seismic exploration. In this paper, we use the classical Boit-Gassmann equation to study the effects of porosity, saturation and fluid composition on the compressional and shear wave velocities and densities of equivalent rocks under different porosity conditions. The impact of the calculation results and analysis of changes in the results. By changing the thickness of the target layer and the composition of the filling fluid, the AVO seismic response is developed and analyzed to establish the correspondence between the fluid properties of the rock and the seismic response characteristics. The results show that the existence of gas has a great influence on the petrophysical properties. When the fluid filled in the target layer is changed from gas to oil and water, the AVO phenomenon of the target layer becomes unseen, and as the thickness of the target layer decreases , The seismic response conforms to the tuning effect.