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与以往利用速度或(和)弹性模量平均方法不同,本文基于Santos发展的三相孔隙介质岩石物理模型考察了两种不相混流体饱和的孔隙介质的地震响应。考虑到地层参考压力和孔隙中两种流体之间的牵引耦合作用,本文详细分析了地层条件下频率、孔隙度和含气饱和度对纵波和横波速度的影响。同时,孔隙度和含气饱和度对Vp/Vs的影响也给予了相应的讨论。用于本文数值研究的数据源自大庆探区深层火山岩样品。数值结果显示,对于低孔低渗的火山岩,纵波和横波的频散效应可被忽略。孔隙中气的含量变化对Vp/Vs的影响较小,但在含水饱和度一定条件下孔隙度的影响相对显著。在这种情况下,准确估计岩性和孔隙度对于深层火山岩来说显得更加重要。
In contrast to previous methods of averaging velocity and / or modulus of elasticity, the petrophysical model of a three-phase porous media developed by Santos was used to investigate the seismic response of two unconstrained fluid-saturated porous media. Taking into account the reference pressure of formation and the coupling between the two fluids in the pore, the paper analyzes the effects of frequency, porosity and gas saturation on the longitudinal and shear wave velocities under formation conditions. At the same time, the influence of porosity and gas saturation on Vp / Vs is also discussed. The data used in the numerical studies in this paper are from deep volcanic rocks in Daqing exploration area. Numerical results show that for low porosity and permeability volcanic rocks, the dispersion effect of longitudinal and shear waves can be neglected. The change of gas content in pores has little effect on Vp / Vs, but the influence of porosity on water saturation is relatively significant. In this case, accurate estimation of lithology and porosity is even more important for deeper volcanic rocks.