Societe Nationale Elf Aquitaine (Production)

Societe Nationale Elf Aquitaine, Division Propriete Industrielle Tour Elf

Patricia Arditty

Philippe J Staron

Georges Arens

Claude Gras

Process for the detection of heterogeneities of a medium. It is defined in that logs of the attenuation of the shear waves and STONELEY waves are produced, the variations of each attenuation log in relation to a mean value are determined, and then the variations are compared with one another in such a manner as to determine the nature of the heterogeneity or of the petrophysical characteristic which has produced these variations. Application in particular in the area of oil and more particularly in the exploration of a medium. FIG. 9.

Process for the detection of heterogeneities and/or for the

The invention relates to a method of seismic exploration by acoustic well logging. It is characterized in that in the traces recorded corresponding to each transmitter-receiver pair, each type of wave of interest is identified using the results of a velocity analysis, then the time of appearance in the trace of a characteristic event of the phase of the wave of interest is determined and the velocity of the wave is deduced from this time and from the thickness of the layer of formation studied.

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Le Chesnay, France

Patricia Arditty