石油学报 ›› 2004, Vol. 25 ›› Issue (4): 38-41.DOI: 10.7623/syxb200404008

• 地质勘探 • 上一篇    下一篇

利用核磁共振测井评价储层的捕集能力

肖立志1, 刘堂宴1,2, 傅容珊3   

  1. 1. 石油大学资源与信息学院, 北京, 102249;
    2. 同济大学海洋和地球科学学院, 上海, 200092;
    3. 中国科学技术大学地球和空间科学学院, 安徽, 合肥, 230026
  • 收稿日期:2003-05-28 修回日期:2004-03-02 出版日期:2004-07-25 发布日期:2010-05-21
  • 作者简介:肖立志,男,1962年3月生,1982年毕业于江汉石油学院石油测井专业,1995年获中国科学院博士学位,现为石油大学(北京)教授,博士生导师,主要从事石油测井和核磁共振理论及应用研究及教学工作.E-mail:xiaolizhi@bjpeu.edu.cn
  • 基金资助:
    中国石油天然气集团公司重大应用基础研究项目(03A30302)油气藏地质及开发国家重点实验室开放基金(TLN0401)联合资助.

Application of nuclear magnetic resonance log to trapping capability evaluation

XIAO Li-zhi1, LIU Tang-yan1,2, FU Rong-shan3   

  1. 1. University of Petroleum, Beijing 102249, China;
    2. Tongji University, Shanghai 200092, China;
    3. University of Science and Technology, Hefei 230026, China
  • Received:2003-05-28 Revised:2004-03-02 Online:2004-07-25 Published:2010-05-21

摘要: 在常规油藏评价中常常忽略对盖层和储层组合的评价.特定储盖层组合下的综合储集能力主要取决于盖层孔隙半径和储层孔隙半径之间的相对数值关系,这个数值关系可以用临界油柱高度表征.盖层一般为泥岩或其他类型的致密岩石,对其取心和岩心分析都很困难,导致盖层孔隙半径的计算精度不高或根本不能计算.根据核磁共振测井对岩石孔隙结构的敏感性,提出了利用核磁测井计算盖层和储层孔隙半径的方法,经过压汞资料的刻度后,核磁共振测井可以计算连续的孔隙半径.在渤海湾井区的实际应用表明,利用核磁共振测井计算的岩石孔隙半径对于确定储盖层的临界油柱高度、评价特定储盖层组合下的油气捕集能力、识别层内致密夹层等方面均有良好的作用.

关键词: 储层, 盖层储集能力, 油柱高度, 孔隙结构, 油藏评价, 核磁共振, 测井

Abstract: The combination evaluation of cap rock and reservoir is often neglected in the conventional reservoir evaluation.For a given com-bination model of cap rocks and reservoirs,the numerical relationship between the pore radius of cap rock and that of reservoir defines the trapping capability and can be expressed as the height of threshold oil column.In general,the cap rock consists of shale or other tight rock. It is difficult to conduct coring and laboratory measurement, which leads to the low calculation precision of the pore radius of cap rock.On the basis of the sensitivity of nuclear magnetic resonance (NMR) log to the porous structure of rock,a new method to calculate the porous radii of cap rocks and reservoir with NMR log was presented.When the NMR log is calibrated with mercury injection data,the porous radii can be obtained continuously.Applications and case studies of the new method in Bohai Bay area suggest that the porous radii of rocks obtained from NMR logs are favorable for calculating the threshold of oil column height and can be applied to evaluate oil trapping capability of the special combination system of cap rock and reservoir and to identify the tight layers in a reservoir.

Key words: reservoir, cap rock, oil trapping capability, oil column height, porous structure, reservoir evaluation, nuclear magnetic resonance, log

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