Chinese Journal of Magnetic Resonance

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Evaluating Shale Porosity and Oil Content with 2D NMR

 NIU Qiang1,2,WANG Zhi-zhan3,ZENG Jian-hui1,WANG Xin2,DU Huan-fu2,GAI Shan-shan2*


 
  

  1. 1. College of Earth Science, China University of Petroleum (Beijing), Beijing 102249, China; 2. Geologging Company of Sheng-li Petroleum Engineering Company Limited, SINOPEC, Dongying 257064, China; 3. SINOPEC Research Institute of Petroleum Engineering, Beijing 100101, China
  • Received:2013-07-04 Revised:2013-11-05 Online:2014-06-05 Published:2014-06-05
  • About author:*Corresponding author:GAI Shan-shan, Tel:13589958586,E-mail: slniuq@126.com.

Abstract:

Compared with conventional reservoir, shale reservoir is characterized by nanoscale pores, non-Darcy flow and self-generating/self-preserving properties. However, it is difficult to probe components in nanoscale pores with T2 relaxation time less than 0.1 ms, and to evaluate fluid types and content in shale reservoir with conventional NMR technology. In this study, high resolution 2D NMR technology was adopted to evaluate eleven shale samples collected from three wells in Shahejie formation of Jiyang Depression. By comparing with the data from formation testing and rock pyrolysis, it was confirmed that the T2spectrum measured with 2D NMR could reflect the properties of nanoscale pores, and D-T2 spectrum could be used to evaluate fluid types and content. The work suggested that high resolution 2D NMR technology is useful in unconventional resource exploration of shale.

Key words: low-field NMR, 2D NMR, shale, nano-scale pore, fluid types and content

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