INFLUENCE DE LA LARGEUR DU PAS D'ECHANTILLONNAGE DU CAROTTAGE CONTINU DE VITESSES SUR LES SISMOGRAMMES SYNTHETIQUES A MULTIPLES*

Attenuation caused by transmission is known to be the greater the closer the samples are taken together. As a result, the amplitudes of seismograms with multiple reflections can be expected to be negligible within a more or less brief time interval, as is the case for seismograms without multiple reflections with attenuation. This paper examines the process by which multiple reflections regenerate these greatly attenuated reflections. It is also ascertained that a sampling interval of one ms for continuous velocity logs is valid for any survey. For economic reasons, we recommend the selection of a larger interval without, however, overdoing things and thus losing too much information.