Method for characterizing subsurface petrophysical...

G - Physics – 01 – V

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G01V 1/30 (2006.01) G06F 17/17 (2006.01)

Patent

CA 2293627

A method for analyzing seismic intervals (12, 14) and predicting subsurface petrophysical properties (170) through the use of a new set of attributes known as Linear Shape Attributes (LSAs) (16, 18, 20). The Linear Shapes (16, 18, 20) form an orthogonal basis set derived directly from the seismic data traces (10a-10g) for the interval in question. Collectively, the LSAs (16, 18, 20) capture substantially all of the useful information contained in the input data set. The input data set may include all or a selected portion of the seismic data traces for the prospect. Petrophysical information obtained from well logs and/or pseudowell logs may be used to calibrate the LSAs (16, 18, 20).

Procédé permettant d'analyser les intervalles sismiques (12, 14) et de prédire les propriétés pétrophysiques d'une formation souterraine (170) au moyen d'un nouvel ensemble d'attributs dénommés "attributs de formes linéaires" (LSA). Les formes linéaires (16, 18, 20) forment un ensemble de base orthogonal dérivé directement des traces de données sismiques (10a-10g) pour l'intervalle en question. Collectivement, les LSA (16, 18, 20) capturent sensiblement toutes les informations utiles contenues dans l'ensemble de données d'entrée, qui peut comprendre la totalité ou une partie sélectionnée des traces de données sismiques nécessaires à la prospection. Les informations pétrophysiques tirées des diagraphies de puits et/ou des diagraphies de pseudo-puits peuvent être utilisées pour étalonner les LSA (16, 18, 20).

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