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Experimental Study on Nano-/Microparticles Transport to Characterize Structures in Fractured Porous Media

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Abstract

Nano- and microparticles are expected to have several functionalities, and the ability to control size and shape is an advantage of using nano-/microparticles. This study investigated a possibility that the sizes of nano-/microparticle can be used to extract new information on structures in a fractured medium. Flow experiments were conducted to observe the particle transport in a micromodel on which a single fracture and rock matrix (grain and pore space) was fabricated on a silicon wafer. Water and nano-/microparticles were injected into the micromodel, and the droplets were collected at the outlet. Tunable Resistive Pulse Sensing (TRPS) was used to measure the frequency distributions of particle diameters from each droplet at each time. The result shows that the larger particles were observed only at early time, while the smaller particles were detected at early time and also at late time. This indicates that the larger particles flow in a fracture quickly, while smaller particles migrate through both fracture and matrix over a wider range of time. Particles with different sizes transport through fractured media differently depending on the fracture structures. The tracer response of nano- and microparticles may be useful to evaluate the fracture structures and the flow properties for different flow pathways.

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Acknowledgements

Many thanks go to Dr. Mohamad Alaskar who let us use his micromodels at Stanford University. This work was supported by the Japan Society for the Promotion of Science under Grant-in-Aid for Young Scientists(A) (JP17H04976) and under Grant-in-Aid for Challenging Research (Exploratory) (JP17K19084), whose supports are gratefully acknowledged.

Funding

This work was supported by the Japan Society for the Promotion of Science under Grant-in-Aid for Young Scientists(A) (JP17H04976) and under Grant-in-Aid for Challenging Research (Exploratory) (JP17K19084), whose supports are gratefully acknowledged. Part of the work was carried out under the Collaborative Research Project of the Institute of Fluid Science, Tohoku University.

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Correspondence to Anna Suzuki.

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The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.

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Suzuki, A., Cui, J., Zhang, Y. et al. Experimental Study on Nano-/Microparticles Transport to Characterize Structures in Fractured Porous Media. Rock Mech Rock Eng 53, 4357–4365 (2020). https://doi.org/10.1007/s00603-020-02081-8

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  • DOI: https://doi.org/10.1007/s00603-020-02081-8

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