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

作者：Li, Ying; Guo, Zhi-Qi^*; Liu, Cai; Li, Xiang-Yang; Wang, Gang

来源：Petroleum Science, 2015, 12(2): 264-272.

DOI：10.1007/s12182-015-0029-6

• Rock physics
• Organic-rich shale
• Kerogen content
• Kerogen porosity
• AVO

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 Toksoz 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.

• 出版日期2015-6
• 单位吉林大学; 中国石油大学（北京）