A method for adapting an unstructured mesh model of a geological subsurface

A device for adapting an unstructured mesh model of a geological subsurface obtained using measurements of said geological subsurface, to match it to a target, said unstructured mesh model comprising a first reference interface and a second reference interface, the first reference interface being associated with a first target interface, the second reference interface being associated with a second target interface, meshes of the unstructured mesh model having corners with coordinates (x, y, z) within said model and with parametric values (u,v,t) within said model, t representing a stratigraphic time for corners the device comprising:

• for each corner between the first reference interface and the second reference interface-:
• a circuit configured to determine a vector at said corner, said vector determined to maximize local variation of t, (u,v) being locally constant along said vector, values of parametric values (u, v, t) being determined based on neighboring corners for the determination of said vector;
• a circuit configured to determine a first distance between said corner and said first reference interface along said vector;
• a circuit configured to determine a second distance between said corner and said second reference interface along said vector;
• a circuit configured to determine a third distance between said corner and said first target interface along said vector;
• a circuit configured to determine a fourth distance between said corner and said second target interface along said vector;
• a circuit configured to modify the coordinates for said corner along said vector as a function of the first distance, the second distance, the third distance and the fourth distance;
• and
• an interface configured to output a modified model based on the modification of the coordinates for said corner.