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 for September 2001 ...

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By ROBERT D. BENSON and THOMAS L. DAVIS
The Geophysical Corner is a regular column in the EXPLORER, edited by R. Randy Ray. This month's column is titled "Multi-Component, Time-Lapse Seismology for Monitoring Reservoir Production Processes."

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S-Waves Detect Reservoir Flows
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Figure 1
Figure 2
Figure 4

Figure 3.

Time-lapse shear-wave velocity anisotropy differences. Phase I) CO2 injection occurred at the CVU-97 well with a prominent S-wave anisotropy anomaly detected to the south. Phase II) CO2 injection occurred at the six offset injectors (indicated by triangles). In the case of the miscible CO2-oil bank, the S2 velocity increased and S1 velocity decreased (purple), whereas, in the case of water injection, the change in effective stress causes the S2 velocity to decrease and S1 velocity to increase (blue).

 for September 2001 ...

AAPG Home > EXPLORER > Geophysical Corner > S-Waves Detect Reservoir Flows > Figure 1 2 3 4