Transport and fate of a LNAPL in fractured clayey till

Abstract

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Direct Measurement of Static and Dynamic Contact Angles Using a Random Micromodel Considering Geological CO2 Sequestration

“…In snap-off, when water is invaded into a water-wet media, the water in the corner of a throat will swell gradually until it disconnects the non-wetting phase in the throat and forcibly pushes non-wetting into pore bodies [60,61]. The snap-off trapping mechanism is dominant for water-wet rocks with a high aspect ratio of pore-body diameter to pore-throat diameter [62]. The snap-off mechanism starts when the non-wetting phase (CO 2 ) fills the pore throat first.…”

Are Visible Fractures Accurate Predictors of Flow and Mass Transport in Fractured Till?

“…Water flow and tracer experiments performed on core samples have been a standard method for determining hydraulic and mass transport parameters for fractured sediments, including till, since the 1980s (Grisak and Pickens 1980; Mackiewicz 1994; Jørgensen et al 2002). Drill‐core, Shelby tube, or Giddings probe samples (<7.62 cm diameter) are commonly used because they can be obtained through standard site sampling protocols (D'Astous et al 1989; Mackiewicz 1994; Fausey et al 2000; Timms et al 2016). In the late 1990s and early 2000s, several studies performed flow and transport experiments on “large, undisturbed till cores (LUTC)” that were ∼ 0.5 m in diameter and ∼ 0.5‐m tall.…”