1. A computer system for modelling hydrocarbon reservoir behaviour to manage fluid flow within the reservoir, the computer system comprising: an analysis module analysing oil field production data by executing program instructions which comprise an optimal regression model which represents injector and producer wells whose fluid flow characteristics are highly correlated with the fluid flow characteristics of the well of interest; executing program instructions which apply parsimonious information criterion techniques to identify well pairs that statistically contribute information to the optimal regression model; and executing 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; and 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.