On a One‐Dimensional Tracer Model

Abstract From the analytical solution to the instantaneous injection model, two sets of equations are given for calculating the three important parameters V, D, and E (effective initial concentration) from two or three points on the tracer breakthrough curve. If two points are used, one must be the maximum concentration on the tracer breakthrough curve. The effective initial concentration (E) calculated from the tracer breakthrough must be less than the initial injection concentration (M/PS) (M is the tracer mass being injected, P is the porosity of the reservoir, and S is the cross‐sectional area of the flow for an injection). The difference between the initial injection concentration and the calculated effective initial concentration might be used to evaluate the degree of tracer loss resulting from a combined effect of multidirectional dispersion, adsorption, and/or decomposition.