A Study on Spine and Rib Properties for Standoff Compensation, Density Log

밀도검층 이격 보정을 위한 기준선과 이격선의 특성 연구

  • Kim, Yeonghwa (Department Geophysics, Kangwon National University) ;
  • Kim, Jongman (Department Geophysics, Kangwon National University)
  • 김영화 (강원대학교 지구물리학과) ;
  • 김종만 (강원대학교 지구물리학과)
  • Received : 2012.10.18
  • Accepted : 2012.11.19
  • Published : 2012.11.30


A series of density log data were obtained from the standoff experiments made in the four physical model boreholes of different densities, and the properties of spine and rib curves have been derived by the analysis of the gamma-gamma data. Particularly, the shape of gamma ray propagation path between source and detector, the geometrical property of spine and rib curves, the influence of borehole density and the detector combination on the properties of the curves, and the adequate detector combination for standoff compensation could be discussed. It was also confirmed that spine and rib slopes can be expressed as proportional to source-to-detector distance ratio between far and near detectors. The result of this experiment was also effectively applied for understanding the basic concept of spine and rib slopes.


Supported by : 강원대학교


  1. 김기주, 2001, 밀도 검층에서의 보정계수 산출을 위한 기초실험과 자연감마 보정, 강원대학교, 이학석사학위논문, 53.
  2. 김영화, 김기주, 임헌태, 김지훈, 공남영, 2004, 밀도검층 검출기 보정에 관한 기초연구, 지구물리, 7, 237-245.
  3. 김영화, 황병철, 박성근, 김종만, 2009, 지하수면 상.하부 환경에서의 PVC 케이싱 이격보정비교 연구, 대한지질공학, 19, 217-225.
  4. 김지훈, 2006, 밀도검층의 효과적인 현장적용을 위한 모형시추공 건설과 밀도검출기 보정에 관한 기초 연구, 강원대학교, 이학석사학위논문, 54.
  5. 이성진, 김영화, 황병철, 2008, 소구경 플라스틱 케이싱 공에서의 밀도검층 보정실험, 대한지질공학, 18, 137-144.
  6. 황세호, 이상규, 1999, 물리검층에 의한 파쇄대 인식과 동적 지반정수의 산출, 한국지구물리학회 1999년도 제2회 학술발표회, 161-162.
  7. Campbell, J. L. P. and Wilson, J. C., 1958, Density logging in Gulf Coast area, J. Petroleum Technology, July, 21-25.
  8. 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.
  9. Gorvachev, Y. I., 1995, Well logging - Fundamentals of Method, John Wiley & Sons Ltd.
  10. Hearst, J. R. and Carlson, R. C., 1969, The RIDS-A density logger for rough holes, Geophysics, 34, 222-234.
  11. Johnson, D. E. and Pile, K., 1988, Well logging for the nontechnical person, PennWell Books.
  12. Pickell, J. J. and Heacock, J. G., 1960, Density logging, Geophysics, 25, 891-904.
  13. Samworth, J. R., 1992, The dual spaced density log - characteristics, calibration, and compensation, The Log Analyst, 33, 42-49.
  14. Schlumberger, 1989, Log Interpretation Principles/Applications, Schlumberger Educational Services, Houston. p. 13-19.
  15. 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 7129477.
  16. Scott, J. H., 1977, Borehole Compensation Algorithms for a Small-diameter, Dual-detector Density Well-logging Probe, SPWLA Eighteenth Annual Logging Symposium, S, 431.
  17. Stoller, C., Urmi, D. G., Philip, O. G., Nihal, I. W., and Wraight, P. D., 1999, Method for determining formation density photoelectric factor with a multi-detector-gamma-ray tool, United States Patent 5912460.
  18. Tittman, J. and Wahl, J. S., 1965, The physical foundations of formation density logging (gamma-gamma), Geophysics, 30, 284-294.
  19. Wahl, J. S., Tittman, J., Johnstone, C. W., and Alger, R. P., 1964, The dual spacing formation density log, J. Pet. Tech., 16, 1411-1416.

Cited by

  1. Improving the Standoff Compensation in a Density Log vol.25, pp.4, 2015,