PROCESS FOR PROSPECTING OF THE GROUND LAYERS SURROUNDING A BOREHOLE

摘要

To determine physical characteristics of successive ground strata, signals are transmitted from successive depth locations in a borehole and received at a surface location spaced from the location of the borehole. The successively transmitted and received signals are compared with signals indicative of the known characteristics of one of the strata layers to determine the characteristics of the other strata through which the successively transmitted signals have traveled.