波谱学杂志 ›› 2006, Vol. 23 ›› Issue (1): 143-151.

• 综述评论 • 上一篇    

油井样品NMRT2 谱的影响因素及T2 截止值的确定方法

  

  1. 1.西北大学 地质学系, 陕西 西安 710069: 2.胜利石油管理局 地质录井公司, 山东 东营 257064
  • 收稿日期:2005-07-18 修回日期:2005-08-05 出版日期:2006-03-05 发布日期:2006-03-05
  • 基金资助:

    国家重点基础研究发展计划(973计划)资助项目(2003CB214601).

Factors Affecting NMR T2 Spectra of Oil Well Samples and Methods for Determining the T2 Cutoff Value

  1. 1.Department of Geology, Northwest University, Xi’an 710069, China; 
    2.Geologging Company, Shengli Petroleum Administration Bureau, Dongying 257064, China
  • Received:2005-07-18 Revised:2005-08-05 Online:2006-03-05 Published:2006-03-05

摘要:

T2 谱是核磁共振(NMR)测、录井技术应用与解释、评价的基础. 岩样T2 谱受仪器测量参数、样品性质(岩性、颗粒大小、样品粒度、样品干湿状态、孔隙流体含量及性质、磁化率、润湿性)及地层水矿化度等因素的影响. T2 截止值是T2 谱中最重要的参数之一,选取的科学性与准确性直接影响到核磁共振测量结果. 通过文献查询,对T2 谱的影响因素及T2 截止值的确定方法进行了分析.

关键词: 核磁共振, T2 谱, 回波时间, 样品性质, 矿化度, T2 截止值

Abstract:

Well-logging and mud-logging using nuclear magnetic resonance (NMR) technology are based on evaluation and interpretation of T2 spectrum measured from the rock samples excavated from potential oil wells. Many factors may affect the T2 spectrum of the rock samples, including technical parameters used in measurement, physical/chemical properties of the rock samples (i.e., lithology, particle size, granularity, dry or wet, composite and properties of pore-fluid, magnetic susceptibility, wettability and so on), degree of mineralization of formation water etc. The most important parameter relevant to logging that is obtainable from the T2 spectra is the T2 cutoff value, whose accurate determination influences greatly the meaning of the results of NMR measurements. In this paper, we reviewed the factors affecting T2 spectra of oil well samples and the current methods for determining T2 cutoff value.

Key words: NMR, T2 spectrum,  logging, degree of mineralization,  T2 cutoff value

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