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Rheological Model for a Vertically Fractured Source Rock

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Abstract

The elastic stress–strain relation of deep source rocks must account for the presence of fractures and lamination due to thermally mature kerogen layers. Clay lamination describes the variation in transverse isotropy with a vertical symmetry (VTI) characteristic of shale background, and vertical fractures induce the transverse isotropy with a horizontal symmetry (HTI) perturbations. Thus, the fractured shale rock can be described as a medium with an orthorhombic symmetry in terms of effective anisotropy. We present a new workflow for calculating the elastic constants of a pressure-dependent fractured shale rock and the effects of clay lamination and microfractures. We investigate the shale fabric that can result in the orthorhombic elastic symmetry and the effect of pressure on elastic parameters, and propose an inversion methodology. Results based on well-log data show that the proposed methodology can be effectively applied to field data.

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Acknowledgements

This work was supported in part by the National Natural Science Foundation of China under Grant 42004111, in part by Jiangsu Innovation and Entrepreneurship Plan, and in part by Jiangsu Province Science Fund for Distinguished Young Scholars (grant no. BK20200021).

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Authors and Affiliations

  1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, Hubei, China

    Guangtan Huang

  2. School of Earth Sciences and Engineering, Hohai University, Nanjing, 211100, China

    Jing Ba

  3. National Institute of Oceanography and Applied Geophysics-OGS, Trieste, Italy

    José M. Carcione

  4. SINOPEC Geophysical Research Institute, Beijing, China

    Weihua Liu

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  1. Guangtan Huang
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Correspondence to Jing Ba.

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Huang, G., Ba, J., Carcione, J.M. et al. Rheological Model for a Vertically Fractured Source Rock. Pure Appl. Geophys. 179, 4521–4539 (2022). https://doi.org/10.1007/s00024-022-03156-z

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