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Bubbles attenuate elastic waves at seismic frequencies: First experimental evidence
Author(s) -
Tisato Nicola,
Quintal Beatriz,
Chapman Samuel,
Podladchikov Yury,
Burg JeanPierre
Publication year - 2015
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2015gl063538
Subject(s) - attenuation , geology , seismic wave , bubble , geophysics , dissolution , seismology , biosphere , frequency domain , mechanics , physics , optics , chemistry , mathematical analysis , mathematics , astronomy
The migration of gases from deep to shallow reservoirs can cause damageable events. For instance, some gases can pollute the biosphere or trigger explosions and eruptions. Seismic tomography may be employed to map the accumulation of subsurface bubble‐bearing fluids to help mitigating such hazards. Nevertheless, how gas bubbles modify seismic waves is still unclear. We show that saturated rocks strongly attenuate seismic waves when gas bubbles occupy part of the pore space. Laboratory measurements of elastic wave attenuation at frequencies <100 Hz are modeled with a dynamic gas dissolution theory demonstrating that the observed frequency‐dependent attenuation is caused by wave‐induced‐gas‐exsolution‐dissolution (WIGED). This result is incorporated into a numerical model simulating the propagation of seismic waves in a subsurface domain containing CO 2 ‐gas bubbles. This simulation shows that WIGED can significantly modify the wavefield and illustrates how accounting for this physical mechanism can potentially improve the monitoring and surveying of gas bubble‐bearing fluids in the subsurface.