DÉCONVOLUTION DE TRACES RÉELLES*

The techniques of deconvolution have been formerly developped and tested on synthetic seismogramms.

They are in the present study applied to field records or play backs.

Three examples of the result of the deconvolution, i.e. of the reduction of filtering effects caused by the apparatus and the ground, are given.

They show that the deconvolution increases the power of resolution and emphasizes thereby the resemblances as well as the differences between traces; consequently it enriches the correlation and improves the picking of the reflections which have a permanent enough character.

Besides, it is shown that the comparison between deconvoluted traces and an impulsionnal synthetic seismogramm is, for the same reasons, more significant than between a field record and a filtered synthetic seismogramm.

Finally, a section of deconvoluted traces shows that it is possible to obtain a valuable increase of resolution using one and the same inverse filter for a group of field records obtained with the same filter setting, even in locations where subsurface conditions are somewhat variable.