Carbonate rock acidification simulation method based on improved dual-scale model

The invention relates to a carbonate rock acidification simulation method based on an improved double-scale model, which comprises the following steps of: (1) obtaining an acid rock reaction rate and an acid liquor concentration parameter under an experiment condition through a rotating rock tray experiment; (2) obtaining target reservoir rock information under experimental conditions through a rock core physical experiment; (3) constructing a flow reaction equation of the acid liquor in the porous medium of the carbonate reservoir by utilizing a Darcy scale model; (4) constructing a multistage acid rock reaction equation; (5) constructing a structure change equation of the carbonate reservoir in the acid etching process; and (6) carrying out numerical simulation on acid-rock reactions of different stages of carbonate rocks. According to the method, errors of a classical acidification dual-scale model caused by approximate processing of reaction series are reduced through a function piecewise fitting method.