초록 ▼

A method for automatic modelling of the stratigraphic structure of an underground zone with fast adjustment of the parameters of the model with observed or measured data is disclosed. The method comprises a) determining, by measurement or observation, a series of quantities (such as sedimentary depo

A method for automatic modelling of the stratigraphic structure of an underground zone with fast adjustment of the parameters of the model with observed or measured data is disclosed. The method comprises a) determining, by measurement or observation, a series of quantities (such as sedimentary deposit heights for example) representative of the stratigraphic structure of the zone at various points, b) implementing a (for example diffusive type) direct initial model depending on a set of parameters representative of the geologic formation process of the zone, c) determining, by means of the initial model, the values taken by the quantities at the various measurement or observation points, d) calculating, by means of the direct model, the gradients (by the analytic or finite-difference type method according to circumstances) of each quantity in relation to the parameters to be adjusted, and e) optimizing the model by minimizing by successive iterations the criterion function (preferably according to a quasi-Newtonian algorithm) until a sufficient difference reduction is obtained, by calculating the sensitivity of the direct model to the parameters to be adjusted, so as to produce a stratigraphic representation of the underground zone.

대표청구항 ▼

[What is claimed is:] [1.]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

[What is claimed is:] [1.]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.