1588 Figure 1 – Concept of CO₂ injection/fixation in goafs 2. FIELD OVERVIEW 2.1 Boring investigation At the study site, the goafs of an underground coal mine are present at a depth of approximately 400 m, with a seam dip of about 30°. A borehole was drilled from the ground surface to a depth of 430 m. The drilling results confirmed the presence of a homogeneous mudstone layer exceeding 300 m in thickness, extending from depths of 6 m to 377 m, which functions as a caprock. The goaf was identified at depths around 400 m (Figure 2). An injection test was subsequently conducted to evaluate the permeability of the goaf. Figure 2 – Drilling core samples
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