Time-space subsurface monitoring using seismic ambient noise

Seismic ambient noise recorded by the ocean bottom nodes (OBNs) in the Gorgon gas field, Western Australia is used to compute time-lapse seafloor models. The extracted hourly cross-correlation (CC) functions of 0.1 – 1 Hz contain mainly Scholte waves with very high signal to noise ratio. The conventional time-lapse analysis suggests relative velocity variations (dv/v) up to 1% assuming a spatially homogeneous dv/v, with a likely 24-hour cycling pattern. With high-resolution baseline models from full waveform inversion of Scholte waves, we propose a wave-equation based double-difference inversion method using differential arrival times for localizing the time-lapse dv/v in the heterogeneous subsurface in depth. The time-lapse velocity models show velocity increase/decrease patterns in agreement with that from conventional analysis, with more notable changes at the shallower depths. We show the feasibility of using ambient noise for quantitative 4-D monitoring of subsurface property changes.
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Topic: Marine Geosciences Seminar - Peng Guo - September 21st
Time: Sep 21, 2022 11:00 AM Paris

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