Formation strength parameters from acoustic and density logs in emplacement holes

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A new acoustic tool for dry emplacement holes has been built and tested in several emplacement holes. This tool uses a large hammer source and 3 piezo-electric transducers that are independently pressed against the borehole wall. The detectors are 6, 9 and 12 ft from the hammer source. A pure gel is injected between these detectors and the borehole wall to eliminate any air space. The compressional wave travel time and the shear wave travel time are recorded at each detector. The compressional wave velocity (V{sub p}) and the shear wave velocity (V{sub s}) are calculated from the travel time ... continued below

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Pages: (39 p)

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Mathews, M.A.; Fenster, R.A. & Plannerer, H.N. January 1, 1991.

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Description

A new acoustic tool for dry emplacement holes has been built and tested in several emplacement holes. This tool uses a large hammer source and 3 piezo-electric transducers that are independently pressed against the borehole wall. The detectors are 6, 9 and 12 ft from the hammer source. A pure gel is injected between these detectors and the borehole wall to eliminate any air space. The compressional wave travel time and the shear wave travel time are recorded at each detector. The compressional wave velocity (V{sub p}) and the shear wave velocity (V{sub s}) are calculated from the travel time differences between the 3 detectors and their separations of 3 and 6 ft. These velocity values along with the bulk density obtained from the density log are used to calculate the Elastic Constants of Young's Modules, Bulk Modules, Shear Modules and Poisson's Ratio. These elastic moduli compared favorably to some core derived elastic moduli obtained from emplacement hole U19ba. These mechanical rock properties are presently used in phenomenological analysis and seismic verification assessment. The V{sub p} velocities obtained from the acoustic logs in U19ba and U3mt compared reasonably well with the geophone survey velocities from these emplacement holes. The only major differences occurred in the fracture intervals of I19ba where the fracture intervals were identified with the borehole camera. The geophone velocities were much less than the acoustic velocities in these fractured intervals. 7 refs., 25 figs.

Physical Description

Pages: (39 p)

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OSTI; NTIS; GPO Dep.

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  • 4. international Mineral and Geotechnical Logging Society (MGLS)/KEGS conference, Toronto (Canada), 18-22 Aug 1991

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  • Other: DE91018022
  • Report No.: LA-UR-91-2682
  • Report No.: CONF-9108135--4
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5009223
  • Archival Resource Key: ark:/67531/metadc1052869

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  • January 1, 1991

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  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 1, 2018, 7:03 p.m.

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Mathews, M.A.; Fenster, R.A. & Plannerer, H.N. Formation strength parameters from acoustic and density logs in emplacement holes, article, January 1, 1991; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1052869/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.