G - Physics – 06 – F
Patent
G - Physics
06
F
G06F 17/18 (2006.01) G01D 21/00 (2006.01) G01N 37/00 (2006.01) G01V 9/00 (2006.01) G01V 11/00 (2006.01)
Patent
CA 2262386
A method for evaluating the coherence of environmental measurements of a given geological medium or field using well logging data is disclosed. A series of N geological parameters are each measured at a series of reference points found in reference wells within this medium. Each reference point is at a different depth and has known lithological characteristics, and the N measurements form a reference observation (X i) corresponding to that point. The same N parameters are measured at application points found in one or more application wells, at depths identical to those of the reference points, forming an application observation (x) for each application point. A neighbouring domain (D i) and acceptance class are defined for each reference observation (X i). Each application observation (x) is then compared with all of reference observations (X i) using a nearest-neighbour algorithm to determine the degree of membership of the application observation in each reference observation's acceptance class. This degree of membership is then used to predict or estimate the lithological characteristics for each application point.
La méthode de caractérisation de la cohérence de mesures de caractéristiques d'un milieu est du type consistant à: prélever N types de mesures de référence en chaque observation (Xi) d'un ensemble de référence; constituer au moins un ensemble d'apprentissage à N dimensions renfermant toutes lesdites observations (Xi); prélever au moins N mesures d'application en chaque observation (Qi) d'un ensemble d'application; comparer chaque observation d'application (x) avec toutes les observations (Xi), et elle est caractérisée en ce qu'elle consiste en outre à: construire pour chaque observation (Xi) un domaine de voisinage (Di), lesdits domaines de voisinage constituant ledit ensemble d'apprentissage et une classe d'acceptation (Ca); et définir un degré d'appartenance des observations d'application (x) à ladite classe d'acceptation (Ca). Application notamment à la reconnaissance de faciès lithologique dans un champ pétrolier.
Rabiller Philippe
Thevoux-Chabuel Hugues
Elf Exploration Production
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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