| Autor: |
Spetzler, Jesper, Ziqiu Xue, Saito, Hideki, Nishizawa, Osamu |
| Předmět: |
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| Zdroj: |
Geophysical Journal International; Jan2008, Vol. 172 Issue 1, p214-225, 12p, 4 Diagrams, 7 Graphs, 1 Map |
| Abstrakt: |
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 10 400 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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