Modelling transport pathways of faults with low hydraulic connectivity in mudstones with low swelling capacity

大野 宏和; 石井 英一; 武田 匡樹

Geoenergy (Internet), 2(1), p.geoenergy2023-047_1 - geoenergy2023-047_10, 2024/12

https://doi.org/10.1144/geoenergy2023-047

Faults in some deep mudstones have poor hydraulic connectivity owing to high normal stress on the fault planes. Designing a method for modeling solute transport pathways in such faults/fractures using available data is a critical issue vis-a-vis the safety assessment of radioactive waste disposal. In this study, faults in deep siliceous mudstones with low swelling capacity are investigated using cross-hole hydraulic and tracer tests between two boreholes. These results indicate that transport pathways in faults with low hydraulic connectivity can be modeled using a highly tortuous 1D pipe flow path.