A rock physics model for the characterization of organic-rich shale from elastic properties

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• 作者：Ying Li ; Zhi-Qi Guo ; Cai Liu ; Xiang-Yang Li ; Gang Wang
• 关键词：Rock physics ; Organic ; rich shale ; Kerogen content ; Kerogen porosity ; AVO
• 刊名：Petroleum Science
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：12
• 期：2
• 页码：264-272
• 全文大小：1,500 KB
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• 作者单位：Ying Li (1)
  Zhi-Qi Guo (2)
  Cai Liu (2)
  Xiang-Yang Li (3) (4)
  Gang Wang (1)
  
  1. College of Computer Science and Technology, Jilin University, Changchun, 130012, Jilin, China
  2. College of Geo-Exploration Science and Technology, Jilin University, Changchun, 130026, Jilin, China
  3. British Geological Survey, Edinburgh, EH9 3LA, UK
  4. CNPC Key Laboratory of Geophysical Prospecting, China University of Petroleum, Beijing, 102249, China
  
• 刊物主题：Mineral Resources; Industrial Chemistry/Chemical Engineering; Industrial and Production Engineering; Energy Economics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1995-8226

文摘

Kerogen content and kerogen porosity play a significant role in elastic properties of organic-rich shales. We construct a rock physics model for organic-rich shales to quantify the effect of kerogen content and kerogen porosity using the Kuster and Toks?z theory and the self-consistent approximation method. Rock physics modeling results show that with the increase of kerogen content and kerogen-related porosity, the velocity and density of shales decrease, and the effect of kerogen porosity becomes more obvious only for higher kerogen content. We also find that the Poisson’s ratio of the shale is not sensitive to kerogen porosity for the case of gas saturation. Finally, for the seismic reflection responses of an organic-rich shale layer, forward modeling results indicate the fifth type AVO responses which correspond to a negative intercept and a positive gradient. The absolute values of intercept and gradient increase with kerogen content and kerogen porosity, and present predictable variations associated with velocities and density.