Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008geoji.172..214s&link_type=abstract
Geophysical Journal International, Volume 172, Issue 1, pp. 214-225.
Astronomy and Astrophysics
Astronomy
3
Inverse Theory, Downhole Methods, Body Waves, Seismic Tomography, Wave Propagation
Scientific paper
We present a case study of time-lapse seismic monitoring of carbon dioxide (CO2) injection by traveltime delay tomography. Unlike standard tomography based on the ray theory, this tomographic method applies the 3-D finite-frequency wavefield theory which in seismology is known as the banana-doughnut theory. To monitor 4-D changes in the subsurface during CO2 injection, crosswell seismic data were measured before the injection was initiated and after injection of 3200, 6200 and 10400 tons CO2 into a porous reservoir sandstone at 1100 m depth. The estimated tomographic velocity images compiled with the finite-frequency wave theory show a clear time-lapse velocity anomaly on the order of -18 per cent below the CO2 injection well head which is in agreement with 4-D sonic logging.
Nishizawa Osamu
Saito Hideki
Spetzler Jesper
Xue Ziqiu
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