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ESSAI DE DETERMINATION AUTOMATIQUE DES VITESSES SISMIQUES PAR MESURES ENTRE PUITS*
- Source: Geophysical Prospecting, Volume 19, Issue 1, Apr 1971, p. 42 - 83
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- 27 Apr 2006
Abstract
Large memory computers create new possibilities for seismic interpretation in well‐drilled areas, and more generally in problems involving deep sources.
Records obtained by well‐to‐surface, surface‐to‐well and/or well‐to‐well propagation contain a large amount of information, owing to the great number of seismic rays travelling throughout the subsurface.
This paper considers two successive steps:
— direct case: computation of the first arrival times of seismic rays propagating through a two‐dimensional subsurface with given vertical and horizontal velocity variations;
— inverse case: computation of a two‐dimensional velocity distribution, knowing the travel times of seismic rays through the subsurface.
A computer program has been elaborated to solve both direct and inverse problems. There are no difficulties with the direct case; a certain number of uncertainties remain with the inverse case.