Advanced SearchSearch Tips
Improving the Standoff Compensation in a Density Log
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
  • Journal title : The Journal of Engineering Geology
  • Volume 25, Issue 4,  2015, pp.525-532
  • Publisher : The Korea Society of Engineering Gelolgy
  • DOI : 10.9720/kseg.2015.4.525
 Title & Authors
Improving the Standoff Compensation in a Density Log
Kim, Jongman; Park, Sung Geun; Jung, Dabin; Kim, Yeonghwa;
  PDF(new window)
After comparing the effectiveness of standoff compensation between current techniques using data obtained from a series of borehole model experiments for standoff compensation in 2007, 2008, and 2009, a follow-up study was conducted to find a more effective standoff compensation algorithm, Comparing the results of the application of the conventional spine and ribs technique, and the spine and ribs technique in terms of apparent density shows that the standoff compensation error obtained from the latter method is more than twice that obtained from the former. The larger size of the compensation error from the spine and ribs plot using the radioactive decay equation indicates that there are no benefits in using this equation in standoff compensation. Based on these results, we propose a reverse transform spine and ribs technique by essentially combining the conventional spine and ribs technique and the spine and ribs technique in terms of apparent density.
standoff compensation;density;spine;rib;
 Cited by
Flaum, C., Galford, J. E., and Hastings, A., 1987, Enhanced vertical resolution processing of dual detector gamma-gamma density logs, SPWLA Twenty-Eighth Annual Logging Symposium, M1-25.

Hearst, J. R. and Carlson, R. C., 1969, The RIDS-A density logger for rough holes, Geophysics, 34(2), 222-234. crossref(new window)

Hwang, S. and Lee, S. K., 1999, Application of geophysical well logging to fracture identification and determination of in-situ dynamic elastic constants, 2nd Conference of Korean Society of Exploration Geophysicists, 161-162 (in Korean with English abstract).

Kim, K., 2001, Experiment for determining calibration coefficients and natural gamma correction in gamma gamma log, MSc thesis, Kangwon National University, 45p (in Korean with English abstract).

Kim, Y. and Kim, J., 2012, A study on spine and rib properties for standoff compensation, density log, Geophysics and Geophysical Exploration, 15(4), 190-198 (in Korean with English abstract). crossref(new window)

Kim, Y., Hwang, B. C., Park, S. G., and Kim, J., 2009, A comparative study of density compensation in gammagamma log in PVC casings above and below ground water table, The Journal of Engineering Geology, 19(2), 217-225 (in Korean with English abstract).

Kim, Y., Kim, J. H., and Lee, S, 2006, A preliminary study on correction for density log in cased boreholes, Journal of Engineering Geology, 16(4), 429-435 (in Korean with English abstract).

Lee, S., Kim, Y., and Hwang, B, C., 2008, An experimental study on density log correction for plastic cased slim boreholes, The Journal of Engineering Geology, 18(2), 127-134 (in Korean with English abstract).

Mickael, M. W., 2003, Standoff compensation for nuclear measurements, United States Patent, Patent No. US 6590202 B2.

Pickell, J. J. and Heacock, J. G., 1960, Density logging, Geophysics, 25(4), 891-904. crossref(new window)

Schlumberger, 1989, Log interpretation principles/applications, Schlumberger Educational Services, Houston, 13-19.

Schneider, D. M., Efremov, S. V., and Sale, M. J., 2006, Method of processing data from a dual detector LWD density logging instrument coupled with an acoustic standoff measurement, United States Patent, Patent No. US 7129477 B2.

Scott, J. H., 1977, Borehole compensation algorithms for a small-diameter, dual-detector density well-logging probe, SPWLA Eighteenth Annual Logging Symposium, 431p.

Stoller, C., Urmi, D. G., Philip, O. G., Nihal, I. W., and Wraight, P. D., 1999, Method for determining formation density photo-electric factor with a multi-detector-gamma-ray tool, United States Patent, Patent No. US 5912460.

Tittman, J. and Wahl, J. S., 1965, The physical foundations of formation density logging (gamma-gamma), Geophysics, 30(2), 284-294. crossref(new window)

Wahl, J. S., Tittman, J., Johnstone, C. W., and Alger, R. P., 1964, The dual spacing formation density log, Journal of Petroleum Technology, 16(12), 1411-1416. crossref(new window)