Rock fracture compliance derived from time delays of elastic waves

被引:15
作者
Moellhoff, M. [1 ]
Bean, C. J. [1 ,2 ]
Meredith, P. G. [3 ]
机构
[1] Univ Coll Dublin, UCD Sch Geol Sci, Seismol & Computat Rock Phys Lab, Dublin 4, Ireland
[2] Univ Coll Dublin, CASL, Dublin 4, Ireland
[3] UCL, Dept Earth Sci, Rock & Ice Phys Lab, London WC1E 6BT, England
关键词
Compliance; Fracture; Time delay; Transmission coefficient; Ultrasonic;
D O I
10.1111/j.1365-2478.2010.00887.x
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The purpose of this study is to compare the reliability of various methods of estimating normal rock fracture compliance from elastic wave measurements. We compare ultrasonic through-transmission laboratory measurements for a smooth fracture in a Westerly granite specimen with numerical simulations and analytical solutions. The focus is on deriving compliance from time delays. The influence of specimen and source transducer width was constrained using numerical wave simulations. We find that measured ultrasonic phase delays are better suited to estimate the fracture compliance than group delays. Using the frequency domain instead of the time domain increases the accuracy of the fracture compliance estimates. We further show that for cases where precise phase delay measurements are unavailable, employing first break times in conjunction with numerical simulations can be considered as an alternative.
引用
收藏
页码:1111 / 1121
页数:11
相关论文
共 24 条
  • [1] [Anonymous], 2007, 11 ISRM C
  • [2] [Anonymous], 2002, ACKNOWLEDGMENTS
  • [3] Quantifying the evolution of static elastic properties as crystalline rock approaches failure
    Heap, M. J.
    Faulkner, D. R.
    [J]. INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES, 2008, 45 (04) : 564 - 573
  • [4] Evaluating the impact of fractures on the long-term performance of the In Salah CO2 storage site
    Iding, Martin
    Ringrose, Philip
    [J]. GREENHOUSE GAS CONTROL TECHNOLOGIES 9, 2009, 1 (01): : 2021 - 2028
  • [5] Jaeger JC., 2009, FUNDAMENTALS ROCK ME
  • [6] Long J.C. S., 1996, Rock Fractures and Fluid Flow
  • [7] Laboratory estimates of normal and shear fracture compliance
    Lubbe, R.
    Sothcott, J.
    Worthington, M. H.
    McCann, C.
    [J]. GEOPHYSICAL PROSPECTING, 2008, 56 (02) : 239 - 247
  • [8] Validation of elastic wave measurements of rock fracture compliance using numerical discrete particle simulations
    Moellhoff, M.
    Bean, C. J.
    [J]. GEOPHYSICAL PROSPECTING, 2009, 57 (05) : 883 - 895
  • [9] MOLLHOFF M, 2003, GEOPH RES ABSTR, V5, P12593
  • [10] First-break timing: Arrival onset times by direct correlation
    Molyneux, JB
    Schmitt, DR
    [J]. GEOPHYSICS, 1999, 64 (05) : 1492 - 1501