目前对储层参数时变特性的研究仅局限在对时变机理的定性分析以及储层参数变化的统计方法描述(并引入到数值模拟计算中)上.针对上述问题,在深入剖析油藏注水开发储层参数时变机理的基础上,根据连续损伤力学观点,首先对孔隙度、渗透率时变进行了数学建模,建立了孔隙度、渗透率与时变参数之间的定量关系.基于此定量关系,建立了力学模型,首次从力学角度给出了储层参数时变的根本原因和力学基础,给出了细致的数学推导过程,并对最终结果进行了实验验证.研究结果指出储层渗透率随冲刷倍数的增大而增大,渗透率的变化倍数与冲刷倍数的2/3次方呈线性相关关系.%At present, the studies on the characteristics of time-varying parameters for the reservoirs are only limit ed in the qualitative analyses of the change mechanism and the description of the statistical method of changed pa rameters (and moreover it has been introduced into the numerical simulation). Focused on the above, on the basis of the deep analysis of time-varying mechanism for water-flooded oil reservoirs, and by means of the viewpoint of continous damage mechanics, the mathmetical modeling is first conducted for the changes of porosity and permea bility and finally the quantitative relations between these parameters and time-varying ones are established. Just based on the quantitative relations, the mechanical model is set up: first of all, from the views of mechanics, the root causes and mechanical foundation are presented in the time variations of those reservoir parameters, and furthermore the mathmetical deduced course is given in detail, finally the ultimate results are proven by tests. The study results show that the permeabilities increase with the washed multiples of the reservoirs and there are linear correlation between the varied multiples of the permeabilities and 2/3 power of the washed times.
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