Process and device for detecting seismic signals in order to obtain vertical seismic profiles during bore drilling operations

A process for determining seismic profiles of underground geologic formations by well bore drilling, wherein the vibrations of the drilling comprise a seismic source and having a plurality of receivers of various types arranged about the seismic source for receiving the vibrations and forming seismic lines with the seismic source, wherein the process comprises:

• a) generating a signal by the drilling;
• b) receiving and analyzing said signal along the seismic lines by the plurality of receivers of various types and thereby receiving a plurality of signal traces, wherein said signal traces of each type of receiver have different characteristics;
• and
• c) processing said plurality of different received signal traces by transforming the frequency domain of said received signal traces, aligning said received signal traces in time, and filtering said received signal traces by multiplying, frequency by frequency, the spectra of the received signal traces according to the expression:
• ##EQU5## wherein, Pj(w) represents a signal trace;
• and wherein the values Pj(w) are combined thereby determining the seismic profile of an underground geologic formation.