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Method and apparatus for geophysical exploration utilizing variation in amplitude attenuation of different frequencies

  • US 3,292,143 A
  • Filed: 03/08/1963
  • Issued: 12/13/1966
  • Est. Priority Date: 03/08/1963
  • Status: Expired due to Term
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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