Patent ID: 6205402
Filing Date: 2001-03-20
Classification: G01V

Abstract:
A method of automatic modeling of a stratigraphic structure of an underground zone with fast automatic adjustment of parameters of a model with observed or measured lithologic data, comprising:determining, by measurement or observation, a series of quantities representative of a stratigraphic structure of the underground zone at different points;implementing a direct initial model depending on a set of parameters representative of a geologic formation process of the underground zone;determining from of the direct initial model, values of the quantities at measurement or observation points;calculating with the direct model, the gradients of the quantities in relation to the parameters to be automatically adjusted; andoptimizing the direct model by minimizing, by successive iterations, a criterion function until sufficient reduction of differences is reached between the parameters of the direct model with the observed or measured lithologic data, by calculating a sensitivity of the direct model to the parameters to be automatically adjusted, to produce a stratigraphic representation of the underground zone.