Translations:Velocity analysis - book/6/en

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Velocities obtained from CVLs are reasonably representative of the velocities of seismic waves through the corresponding formations, although that correspondence is by no means exact. Differences arise from several causes. Among them is the invasion of a porous formation by the drilling fluid so that the velocity is not representative of the formation’s true velocity. Discrepancies also result from borehole geometric effects as well as from the fact that seismic-exploration frequencies are substantially lower than those employed in recording the CVL.