Method and system for predicting time-varying principle of waterflooding oil reservoir formation parameters

A system for predicting a time-varying principle of waterflooding oil reservoir formation parameters, comprising:

• an initial data acquiring module configured to acquire a measured pore size distribution curve and a measured T2 spectrum of a rock sample of a waterflooding oil reservoir;
• a model buildhdng module configured to build a measured T2 spectrum-pore size relation model according to the measured pore size distribution curve and the measured T2 spectrum;
• a T2 spectrum acquiring module configured to acquire a T2 spectrum of the rock sample at different water injection amounts during a waterflooding physical simulation experiment;
• a pore size distribution curve creating module configured to obtain a pore size distribution curve at different water injection amounts by using the measured T2 spectrum-pore size relation model according to the T2 spectrum of the rock sample at different water injection amounts;
• a mathematical model building module configured to build a mathematical model of the pore size distribution curve changing with water injection parameters of the rock sample according to the pore size distribution curve at different water injection amounts, wherein the water injection parameters of the rock sample comprise a water injection amount, an initial permeability of the rock sample, an average water injection rate, an initial porosity, a clay type, an initial clay content, and a median particle size;
• a pore network model building module configured to build a pore network model at different water injection amounts according to the mathematical model;
• a permeability calculating module configured to perform oil-water two-phase flow simulation by using the pore network model at different water injection amounts, and calculate a corresponding oil-water two-phase relative permeability curve of the rock sample at different water injection amounts, wherein the oil-water two-phase relative permeability curve is the formation parameters in the waterflooding oil reservoir.