Patent ID: 7400978

Claim:
A method allowing prediction of petrophysical characteristics of an underground reservoir, comprising: constructing a geologic model from geologic measurements acquired in depth; simulating in depth seismic data, acquisition in time of seismic measurements on which at least two seismic markers distant from one another by an observed thickness in time ΔT obs m,n are identified; making the geologic model consistent with the seismic measurements by minimizing an objective function; simulating in depth seismic velocities allowing estimation of the thickness in depth ΔZ est m,n of the markers, and simulating an error ε sim m,n made on this estimation; carrying out time conversion of the seismic data simulated in depth by means of an interval velocity deduced from the observed thickness in time ΔT obs m,n and from the error ε sim m,n ; updating the interval velocity by comparing, within the objective function, the observed thickness in time ΔT obs m,n with a thickness in time ΔT sim m,n simulated from the seismic data, and by modifying said simulation of said error ε sim m,n ; carrying out the consistency enforcement operation by minimization of the objective function by comparing the seismic measurements with the simulated seismic data converted to time; and predicting the petrophysical characteristics of the underground reservoir from the geologic model.