TERMIUM Plus®

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DENSITY LOG [1 record]

Record 1 2000-03-15

English

Subject field(s)
  • Geophysics
  • Geological Prospecting
DEF

A special radioactivity log that has been developed for open-hole surveying that responds principally to variations in the specific gravity of the formations. It is a contact log (i.e., the instrument is held against the wall of the hole). The logging tool emits neutrons and then measures the secondary gamma radiation that is scattered back to the detector in the instrument.

OBS

The density log is recognized as an excellent porosity-measuring device, particularly for shaly sands. It is also called Gamma-Gamma Density Log, Formation Density Log, or Densilog, all of which are trade names.

OBS

Densilog: The trade name of one type of density log.

French

Domaine(s)
  • Géophysique
  • Prospection géologique
DEF

Dispositif permettant de mesurer la densité des formations dans les forages.

CONT

Diagraphie de densité. On irradie la paroi du sondage [...] avec une source de rayons gamma. Un compteur placé dans un même plan et protégé du rayonnement direct de la source, reçoit les rayons gamma diffusés par la formation vers le sondage. Le signal reçu par le compteur est relié à la densité du terrain puisque l'on enregistre les rayons gamma qui ont subi une diffusion [...]

Spanish

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