Elf Exploration Production

Elf Aquitaine Production

Philippe Rabiller

Naamen Keskes

Shinju Ye

Fr&eacute;d&eacute;ric Robail

Shin-Ju Ye

Hugues Thevoux-Chabuel

Method of detecting breaks in logging signals consisting of logs of different kinds recorded as a function of depth, of the type consisting in selecting a portion from each of the said logs in such a way that all the selected portions have a same depth interval in common, one of the selected portions being regarded as reference portion; selecting a parent wavelet function and constructing, from the said parent function, a family of wavelet analysis functions dependent on spatial frequency and on depth, the said method being characterized in that it furthermore consists in calculating, for each portion of log selected and for each depth datum, the absolute value of the mean gradient of the characteristic quantity of the wavelet transform for the various spatial analysis frequencies; selecting, for each portion of log processed, the peaks of the absolute value of the mean gradient of the characteristic quantity.

Method of detecting breaks in logging signals relating to a region of a medium

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 (Xi) 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 neighboring domain (Di) and acceptance class are defined for each reference observation (Xi). Each application observation (x) is then compared with all of reference observations (Xi) using a nearest-neighbor 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.

Method for characterizing the coherence of an environment characteristic measurements

Method for automatic detection of planar heterogeneities crossing the stratification of an environment

Method for automatically determining stratification beds in a site

Method for obtaining a representation of a geological structure

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Lescar, France

Philippe Rabiller