1. A computer system for modelling hydrocarbon reservoir behaviour to manage fluid flow within the reservoir, the computer system comprising: an analysis module usable by said computer system and having computer readable program code embodied therein, said computer readable program code adapted to be executed to cause the computer system to analyse oil field production data by executing program instructions which comprise an optimal regression model which represents both injector and producer wells whose fluid flow characteristics are correlated with the fluid flow characteristics of a well of interest, execute program instructions which apply information criteria to identify well pairs whose flow rate and pressure data statistically contribute information to the optimal regression model, and execute program instructions which obtain a statistical reservoir model whose elements are the product of corresponding elements in the optimal regression model and a significance matrix where the significance matrix statement is made upon the matrix of the significance test −N i,j =1 where the well pairs fluid flow characteristics are statistically significant as a consequence of their contributing information to the optical regression model, otherwise N i,j =0; and a control for modifying the reservoir fluid flow at one or more wells of interest to manage fluid flow in response to the statistical reservoir model of the analysis module.