Active and Passive acoustic logging applied to the detection of preferential flow in a sedimentary aquifer | Science and Technology for Energy Transition (STET)

Characterization and Modeling of the Subsurface in the Context of Ecological Transition

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Fig. 3

Passive acoustic logging in borehole B2. Noise section (a), Noise analysis in different frequency bandwidths (0–5 kHz (black curve), 5–10 kHz (red curve), 10–15 kHz (green curve), 15–20 kHz (blue curve)). Noise spectral amplitude logs (b), Noise frequency logs (c).

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