METHOD FOR MEASURING ANISOTROPY OF PROPAGATION OR REFLECTION OF A TRANSVERSE WAVE, IN PARTICULAR A METHOD OF GEOPHYSICAL PROSPECTION BY MEASURING ANISOTROPY OF PROPAGATION OR REFLECTION OF SHEAR WAVES IN ROCKS

摘要

P THE INVENTION PERMITS THE MEASUREMENT OF THE PROPAGATION ANISOTROPY OF A TRANSVERSE WAVE BETWEEN TWO REFERENCE POINTS GIVEN FROM A NON-ISOTROPIC MEDIUM, IN PARTICULAR A SHEAR WAVE IN A LAMINATED OR CRACKED ROCK. / P P ACCORDING TO THE INVENTION: A SOURCE S AND TWO DETECTORS G, G ARE ALSO AVAILABLE ALONG THE SAME VECTOR RADIUS, THE DETECTORS ARE PLACED IN RESPECT OF THE RESPECTIVE REFERENCE POINTS; THE SOURCE IS EXCITED BY AN EXCITATION SIGNAL PRODUCING A TRANSVERSE WAVE IN THE ENVIRONMENT; THE RESULTING RESPECTIVE MEASUREMENT SIGNALS PRODUCED BY EACH OF THE DETECTORS ARE COLLECTED; FROM THE EXCITATION SIGNAL AND THE MEASURING SIGNALS, THE FUNCTION OF TRANSFER OF THE ENVIRONMENT IS DETERMINED ALONG EACH OF THE TWO RESPECTIVE SOURCE-DETECTOR PATHS; DETERMINING THE FUNCTION OF DIFFERENTIAL TRANSFER OF THE ENVIRONMENT BETWEEN THE TWO REFERENCE POINTS. OTHER CONFIGURATIONS, IN PARTICULAR TWO SOURCES AND A DETECTOR, CAN BE ALSO PROVIDED OR THE METHOD APPLIED TO THE SEISMIC REFLECTION WITH WAVES WITH OBLIQUE OR EVEN ZERO IMPACT. / P