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Scientific Value of Coring the Proposed Southern Appalachian Research Drill Hole (1987) / Chapter Skim
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INTERPRETATION OF LOGS
Pages 38-41

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From page 38...
... Borehole logging and core analysis acquire complementary pieces of information, and each produces information not available from the other. This is the fundamental reason that the Ocean Drilling Program requires both continuous core and logging in all holes more than 400 m deep.
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From page 39...
... Drill hole measurements determine the in situ physical and chemical environmental conditions, but laboratory pressure vessels can measure core properties in a wide variety of physical and chemical environments. Such laboratory measurements are especially important when information must be extrapolated deeper than the hole was drilled.
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From page 40...
... bore hole logging measurements. In addition to calibration of logging results, knowledge of electrical properties of rocks encountered in drilling will aid in interpretation of geophysical studies, such as magnetotelluric soundings that might be carried out far from the drill hole but in geologically similar terrane (Stanley et al., 1977)
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From page 41...
... Permeability measurements on core give a grain-size lower-limit to these in situ measurements. The difference between permeability measured in the laboratory on core and that at various scales measured in situ provides essential information about structural control of hydrological parameters not available by any other means.
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Key Terms

  • drill hole
  • elastic constants
  • electrical properties
  • oriented core
  • continuous core

  • magnetic susceptibility
  • rock deformation
  • hole logs
  • clay mineralogy
  • field intensity

  • sidewall samples
  • accurately model
  • mineralogy due
  • magnetotelluric soundings
  • requiring oriented

  • hole measurements
  • wave velocities
  • anomaly signatures
  • applied stress
  • fluid inclusion

  • physical property
  • concerning bulk
  • van der
  • chemical environments
  • frictional strengths

  • fundamental reason
  • situ provides
  • geologically similar
  • pore morphology
  • intervals throughout


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