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A Review on nuclear magnetic resonance logging: fundamental theory and measurements

자기공명검층: 기본 이론 및 자료 측정

  • Jang, Jae Hwa (Sejong University, Department of Energy and Mineral Resource Engineering) ;
  • Nam, Myung Jin (Sejong University, Department of Energy and Mineral Resource Engineering)
  • 장재화 (세종대학교 에너지자원공학과) ;
  • 남명진 (세종대학교 에너지자원공학과)
  • Received : 2012.09.17
  • Accepted : 2012.11.23
  • Published : 2012.11.30

Abstract

Nuclear magnetic resonance (NMR) logging has been considered one of the most complicated nevertheless, one of the most powerful logging methods for the characterization on of both rocks and natural fluids in formation. NMR measures magnetized signals (polarization and relaxation) between the properties of hydrogen nucleus called magnetic moment and applied magnetic fields. The measured data set contains two important petrophysical properties such as density of hydrogen in the fluids inside the pore space and the distinct decay rate for fluid type. Therefore, after the proper data processing, key petrophysical information, not only the quantities and properties of fluids but also supplies of rock characterization in a porous medium, could be archived. Thus, based on this information, several ongoing researches are being developed in estimating aspects of reservoir productivity information, permeability and wettability since it is the key to having correct interpretation. This study goes through the basic theory of NMR at first, and then reviews NMR logging tools as well as their technical characteristics. This paper also briefly discusses the basic knowledge of NMR simulation algorithm by using Random walk.

Acknowledgement

Supported by : 한국에너지기술평가원(KETEP)

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