Based on network simulation, the change relationship between reservoir macro-parameters and micro-parameters is studied.
Table 3 has embodied the relation between reservoir macro-parameters and the major micro-parameters successfully.
It is quite difficult to understand the relationship between macro-parameters and micro-parameters in different cases of micro-parameters' variation.
The study on reservoir parameters' time-variability provides an effective simulation technique to establish the internal relationship of reservoir micro-parameters, macro-parameters, and oilfield development rules.
To build a comprehensive model describing the variability of reservoir macro-parameters, one needs to investigate the relationship between the variability of reservoir macro-parameters and that of micro-parameters.
To compare the influence degree of different micro-parameters on reservoir macro-parameters and determine the main influential factors, the variance coefficient is selected as the evaluation index, which takes the form of Eqs. 14 and 15.
By adjusting the reservoir macro-parameters such as porosity, permeability, and relative permeability curve, the influence of reservoir parameters' variation on oilfield development rules can be studied, and then, the internal relationship between reservoir macro-parameters and oilfield development rules can be established.
By adjusting micro-parameters of the network model, it can simulate the impact of reservoir micro-parameters' variation on macro-parameters (Hou et al. 2011a, b), and thus, it provides an effective tool to describe the internal relationship between reservoir macro-parameters and reservoir micro-parameters.
Table 3 Trend of reservoir macro-parameters' and micro-parameters' change as waterflooding develops Influence parameters ϕ K S wc S or K rwo Pore throat radius ↑ ↑ Homogeneity coefficient of pore throat ↑ ↑ Pore throat ratio ↑ ↓ ↑ Wettability (tend to water-wet) ↑ Shape of pore throat (tend to regular) ↑ ↑ Coordination number ↑ ↓ ↑.
Finally, the formula between (elastic, elastic-plastic, plastic) contact area, (elastic, elastic-plastic, plastic) contact load and the key parameters (fractal parameters and macro parameters) are derived based on the proposed model.
