Equivalent salt deposit density prediction method based on fourth-order Runge-Kutta and simulated annealing

The present invention provides an equivalent salt deposit density prediction method based on fourth-order Runge-Kutta and simulated annealing, comprising the following steps that: (1) parameter dynamization processing is performed on a classical prediction mode to obtain a discrete classical prediction model expressed by a first-order Euler equation; (2) a fourth-order Runge-Kutta algorithm is introduced to perform higher order derivation iteration on the Euler equation obtained in step (1), to suppress a discrete error of an Euler model; (3) global optimal estimation is performed on model parameters by using an annealing simulation algorithm, so that an equivalent salt deposit density prediction model with high accuracy is achieved; the error that a prediction result of a classical accumulative formula of the equivalent salt deposit density is a negative value at zero time is eliminated, thereby avoiding introduction of a new error; the prediction error is effectively suppressed and a more accurate prediction result is acquired; the difficulty in fitting of a nonlinear high-order model is resolved, the fitting speed is increased, and the optimal estimation value of the parameter is quickly acquired; the defect of the fixed parameter in the classical prediction model is overcome, and dynamic parameter estimation is achieved.