Method of constraining seismic inversion

摘要

A method of modelling a subsurface volume comprises the steps of: obtaining petrophysical data relating to valid geological and/or dynamical scenarios, converting this data into valid combinations of elastic parameters (e.g. Vp, Vs, r); projecting 220 the valid combinations of elastic parameters onto a spherical plot; and determining 225 a penalty term from the distances between each cell of the spherical plot and the nearest valid combination of elastic parameters within the subsurface volume. Valid geological and/or dynamical scenarios comprise those which are petrophysically possible. The penalty term may be used to constrain an inversion 240 minimising a cost function associated with seismic mismatch between two or more seismic surveys.