Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Spine and Ribs Techniques for Practical use of Standoff Compensation in a Density Log

밀도검층 이격보정 실용화를 위한 Spine and Ribs 기법 연구

  • Han, Manho (Convergence Research Center for Development of Mineral Resources, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Yeonghwa (Department of Geophysics, Kangwon National University) ;
  • Yi, Myeong-Jong (Convergence Research Center for Development of Mineral Resources, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Jongman (Smart Korea)
  • 한만호 (한국지질자원연구원 DMR융합연구단) ;
  • 김영화 (강원대학교 지질.지구물리학과) ;
  • 이명종 (한국지질자원연구원 DMR융합연구단) ;
  • 김종만 (스마트코리아)
  • Received : 2017.10.09
  • Accepted : 2018.02.26
  • Published : 2018.02.28
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Abstract

We carried out the standoff compensation data from 2007 to 2011 into four different density borehole models to find out the most effectiveness of standoff compensation charts. First, we investigated the irregular collapse characteristics of gamma ray and cut the non-ideal gamma response to improve the effectiveness of the standoff compensation error data. Effectiveness of detector combinations, density of borehole, and spine and ribs techniques from the modified standoff compensation data was analyzed. As the result of comparison, LSD-MSD combination has been suitable for standoff compensation more than LSD-SSD combination and it is possible to do standoff compensation for soil or weathered zone under groundwater level without fatal errors. Even though error scales of density transformed spine and ribs techniques were generally large compared to the conventional standoff compensation, standoff compensation for soil and weathered zone under groundwater level were sufficiently effective.

밀도가 다른 4개의 실험공에서 2007년부터 2011년까지 수행한 이격보정 실험 자료를 이용하여 가장 효과적인 보정 차트를 알기 위해 연구를 수행하였다. 먼저 선원의 불규칙적인 붕괴특성을 파악하고 비이상적인 감마반응을 잘라내는 방법으로 이격보정 자료의 효과를 높였다. 수정된 이격보정 자료로부터 검출기 조합별, 시추공 밀도별, 이격보정 기법별 효과를 분석하였다. 그 결과 통상적으로 사용해 온 LSD-SSD 조합보다 LSD-MSD 조합이 이격보정에 더 적합하며, 지하수위면 하부에 위치한 토양층이나 풍화대의 이격보정에서는 큰 오차를 피하면서 이격보정이 가능한 것으로 나타났다. 일반 이격보정에 비해 밀도형 이격보정에서 오차의 규모가 전반적으로 높게 나타났으나 지하수면 하부에 있는 풍화대나 토양층을 대상으로 하는 이격보정에서는 충분히 밀도형 이격보정이 효과적인 것으로 나타났다.

Keywords

References

  1. Flaum, C., Galford, J.E. and Hastings, A. (1987) Enhanced Vertical Resolution Processing Of Dual Detector Gamma-Gamma Density Logs. In SPWLA 28th Annual Logging Symposium. Society of Petrophysicists and Well-Log Analysts.
  2. Hearst, J.R. and Carlson, R.C. (1969) The RIDS-A density logger for rough holes: Geophysics, v.34, p.222-234. https://doi.org/10.1190/1.1440008
  3. Hwang, S.H. and Lee, S.K. (1999) Application of geophysical well logging to fracture identification and determination of in-situ dynamic elastic constants, Geophysical Society of Korea 1999 The 2nd International Conference, p.161-162.
  4. Kim, K.J. (2001) Experiment for determining calibration coefficients and natural gamma correction in gamma gamma log, Master's thesis, Kangwon national university, p.30.
  5. Kim, Y.H., Kim, J.H. and Lee, S.J. (2006) A preliminary study on correction for density log in cased boreholes, The journal of engineering geology, v.16, p.429-435.
  6. Ku, B.J., Nam, M.J. and Hwang, S.H. (2012) A study on slim-hole density logging based on numerical simulation. Geophysics and Geophysical Exploration, v.15, p.227-234. https://doi.org/10.7582/GGE.2012.15.4.227
  7. Lee, S.J., Kim, Y.H. and Hwang, B.C. (2008) An experimental study on density log correction for plastic cased slim boregoles, The journal of engineering geology, v.18, p.137-144.
  8. Mickael, M.W. (2003) Standoff compensation for nuclear measurements, United States Patent, Patent No. US 6590202 B2.
  9. Park, S.G. (2010) Variation property of spine and rib curves and tim lapse standoff compensation, Master's thesis, Kangwon national university, p.7.
  10. Pickell, J.J. and Heacock, J.G. (1960) Density logging: Geophysics, v.25, p.891-904. https://doi.org/10.1190/1.1438769
  11. Schlumberger (1989) Log Interpretation Principles/Applications, Schlumberger Educational Services, Houston, p.13-19.
  12. 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.
  13. Scott, J.H. (1977) Borehole Compensation Algorithms for a Small-diameter, Dual-detector Density Well-logging Probe, SPWLA Eighteenth Annual Logging Symposium, S, p.431.
  14. 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.
  15. Tittman, J. and Wahl, J.S. (1965) The physical foundations of formation density logging (gamma-gamma): Geophysics, v.30, p.284-294. https://doi.org/10.1190/1.1439574
  16. Wahl, J.S., Tittman, J., Johnstone, C.W., and Alger, R.P. (1964) The dual spacing formation density log: Jour. Of Pet. Tech., v.16, p.1411-1416. https://doi.org/10.2118/989-PA
  17. Won, B.H., Hwang, S.H., Shin, J.H., Park, C.J., Kim, J.M. and Hamm, S.Y. (2014) Response characterization of slim-hole density sonde using Monte Carlo method. Geophysics and Geophysical Exploration, v.17, p.155-162. https://doi.org/10.7582/GGE.2014.17.3.155