VELOCITY OF COMPRESSIONAL WAVES IN POROUS MEDIA AT PERMAFROST TEMPERATURES

MEASUREMENTS OF VELOCITY OF COMPRESSIONAL WAVES IN CONSOLIDATED POROUS MEDIA, CONDUCTED WITHIN A TEMPERATURE RANGE OF 26 C TO -36 C, INDICATE THAT: (1) COMPRESSIONAL WAVE VELOCITY IN WATER-SATURATED ROCKS INCREASES WITH DECREASING TEMPERATURE WHEREAS IT IS NEARLY INDEPENDENT OF TEMPERATURE IN DRY ROCKS, (2) THE >HAPES OF THE VELOCITY VERSUS TEMPERATURE CURVES ARE FUNCTIONS OF LITHOLOGY, PORE STRUCTURE, AND THE NATURE OF THE INTERSTITIAL FLUIDS. AS A SATURATED ROCK SAMPLE IS COOLED BELOW 0 C, THE LIQUID IN PORE SPACES WITH SMALL SURFACE-TO-VOLUME RATIOS (LARGER PORES) BEGINS TO FREEZE AND THE LIQUID SALINITY CONTROLS THE FREEZING PROCESS. AS THE TEMPERATURE IS DECREASED FURTHER, A POINT IS REACHED WHERE THE SURFACE-TO-VOLUME RATIO IN THE REMAINING PORE SPACES IS LARGE ENOUGH TO AFFECT THE FREEZING PROCESS, WHICH IS COMPLETED AT THE CRYOHYDRIC TEMPERATURE OF THE SALTS-WATER SYSTEM. IN THE ICE-LIQUID-ROCK MATRIX SYSTEM, PRESENT DURING FREEZING, A THREE-PHASE, TIME-AVERAGE EQUATION MAY BE USED TO ESTIMATE THE COMPRESSIONAL WAVE VELOCITIES. BELOW THE CRYOHYDRIC TEMPERATURE, ELASTIC WAVE PROPAGATION TAKES PLACE IN A SOLID-SOLID SYSTEM CONSISTING OF ICE AND ROCK MATRIX, /GA/

  • Supplemental Notes:
    • Vol 33, No 4, PP 584-595, FIG, TAB
  • Corporate Authors:

    Society of Exploration Geophysicists

    Shell Building, P. O. Box 3098
    Tulsa, OK  USA  74101
  • Authors:
    • Timur, A
  • Publication Date: 0

Media Info

  • Serial:
    • Geophysics
    • Issue Number: 0
    • Publisher: Society of Exploration Geophysicists

Subject/Index Terms

Filing Info

  • Accession Number: 00229652
  • Record Type: Publication
  • Source Agency: Geophysical Abstracts
  • Files: TRIS
  • Created Date: Aug 15 2004 2:39AM