Method and apparatus for geophysical exploration utilizing variation in amplitude attenuation of different frequencies
First Claim
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1. A METHOD OF EXPLORATION FOR DATA ON THE CHARACTER OF A GEOPHYSICAL FORMATION ADJACENT THE WALL OF A BOREHOLE, COMPRISING THE STEPS OF INTRODUCING ACOUSTIC ENERGY AT SELECTED THREE OR MORE DIFFERENT FREQUENCIES INTO THE BOREHOLE WALL AT A FIRST LOCATION, SAID FREQUENCIES HAVING A FIXED AMPLITUDE RELATIONSHIP BETWEEN THEM, SAID ACOUSTIC ENERGY PASSING THROUGH THE FORMATION AND BACK TO THE BOREHOLE;
- RECEIVING THE RETURNING ACOUSTIC ENERGY AT A SECOND LOCATION FIXEDLY SPACED ALONG THE BOREHOLE WALL FROM SAID FIRST LOCATION;
DETECTING THE AMPLITUDE RELATIONSHIP OF A FIRST COMBINATION OF SAID SELECTED FREQUENCIES;
DETECTING THE AMPLITUDE RLATIONSHIP OF A SECOND COMBINATION OF SAID SELECTED FREQUENCIES, THE FREQUENCIES OF SAID SECOND COMBINATION HAVING LONGER WAVELENGTHS THAN THE FREQUENCIES IN SAID FIRST COMBINA-
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1. A METHOD OF EXPLORATION FOR DATA ON THE CHARACTER OF A GEOPHYSICAL FORMATION ADJACENT THE WALL OF A BOREHOLE, COMPRISING THE STEPS OF INTRODUCING ACOUSTIC ENERGY AT SELECTED THREE OR MORE DIFFERENT FREQUENCIES INTO THE BOREHOLE WALL AT A FIRST LOCATION, SAID FREQUENCIES HAVING A FIXED AMPLITUDE RELATIONSHIP BETWEEN THEM, SAID ACOUSTIC ENERGY PASSING THROUGH THE FORMATION AND BACK TO THE BOREHOLE;
- RECEIVING THE RETURNING ACOUSTIC ENERGY AT A SECOND LOCATION FIXEDLY SPACED ALONG THE BOREHOLE WALL FROM SAID FIRST LOCATION;
DETECTING THE AMPLITUDE RELATIONSHIP OF A FIRST COMBINATION OF SAID SELECTED FREQUENCIES;
DETECTING THE AMPLITUDE RLATIONSHIP OF A SECOND COMBINATION OF SAID SELECTED FREQUENCIES, THE FREQUENCIES OF SAID SECOND COMBINATION HAVING LONGER WAVELENGTHS THAN THE FREQUENCIES IN SAID FIRST COMBINA-
- RECEIVING THE RETURNING ACOUSTIC ENERGY AT A SECOND LOCATION FIXEDLY SPACED ALONG THE BOREHOLE WALL FROM SAID FIRST LOCATION;
Specification