PRELIMINARY REPORT ON GEOPHYSICAL AND MECHANICAL BOREHOLE MEASUREMENTS AT STRIPA

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Four different systems of borehole instrumentation have been employed thus far at an experimental site at Stripa, Sweden where a series of hydrological and thermo-mechanical experiments are being conducted to examine the suitability of granitic rock for the storage of radioactive waste materials. Asuite of seven logs--neutron, gamma-gamma, resistivity, gamma ray, sonic, caliper, and temperature--operated in a borehole of 380-m depth located eleven zones where the rock permeability is expected to be enhanced due to the presence of open fractures. The sonic waveform record proved especially useful in this regard. Borehole measurements were also acquired in a large number of ... continued below

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165 p.

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Nelson, P.; Paulsson, B.; Rachiele, R.; Andersson, L.; Schrauf, T.; Hustrulid, W. et al. May 1, 1979.

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Description

Four different systems of borehole instrumentation have been employed thus far at an experimental site at Stripa, Sweden where a series of hydrological and thermo-mechanical experiments are being conducted to examine the suitability of granitic rock for the storage of radioactive waste materials. Asuite of seven logs--neutron, gamma-gamma, resistivity, gamma ray, sonic, caliper, and temperature--operated in a borehole of 380-m depth located eleven zones where the rock permeability is expected to be enhanced due to the presence of open fractures. The sonic waveform record proved especially useful in this regard. Borehole measurements were also acquired in a large number of boreholes from 5- to 14-m length located in experimental drifts some 340-m underground. Here several physical properties, including the porosity, density, sonic velocity, and borehole rugosity, are generally quite uniform, with the exception of a few local chloritic zones and a few minor fractures. However, in situ determinations of the mechanical modulus with the CSM cell indicate substantial variability, with some apparent fracture control. Uranium and thorium concentrations are quite high in the Stripa granite, with local fluctuations associated with mineralogical changes as revealed by the gamma-ray log. Adifferential resistance probe appears promising as a sensitive detector of fine fracturing. Across-hole ultrasonic system indicates variations of a few percent in compressional- and shear-wave velocities, reflecting the presence of fractures and changes in fracture characteristics as the rock is heated in a simulated storage test. The geophysical and mechanical data are being compared with the results from core and television logging, with hydrological test data on static pressure and injection permeability, and with displacements induced by thermal loading.

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165 p.

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  • Report No.: LBL-8280
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/1022102 | External Link
  • Office of Scientific & Technical Information Report Number: 1022102
  • Archival Resource Key: ark:/67531/metadc836032

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • May 1, 1979

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • June 15, 2016, 9:32 p.m.

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Nelson, P.; Paulsson, B.; Rachiele, R.; Andersson, L.; Schrauf, T.; Hustrulid, W. et al. PRELIMINARY REPORT ON GEOPHYSICAL AND MECHANICAL BOREHOLE MEASUREMENTS AT STRIPA, report, May 1, 1979; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc836032/: accessed January 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.