In this paper we have questioned the present accepted concept of straight-line path of the refracted beam (in velocity logging) as the source of energy for the first arrivals recorded by the receivers. The energy considerations and the field data indicate that possibly we are looking at the curved paths, an idea which so far has not been discussed thoroughly in the literature. Equations are developed for this curve path which are based on Pickett's empirical relation. Some specific cases were analyzed using the IBM 650. It is evident that these curved paths could be utilized in some cases to yield information about the permeability in situ. In general it is concluded that the field of velocity logging has tremendous potentialities, and there is plenty of room for further research in this area. For example, the development of sonic logging to yield porosity and permeability of the formation in situ is very intriguing. The ideas presented in this paper, after further experimental verification, can also be applied to surface seismic prospecting.

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