Research Article
An Experimental and Modeling Study on the Response to Varying Pore Pressure and Reservoir Fluids in the Morrow A Sandstone
Table 4
Percentage change of S-wave velocity with increasing differential pressure from 15.17 MPa to 37.92 MPa.
| Sample | Dry Rock Loading | Dry Rock Unloading | Brine Sat. | Oil Flushed | Oil-CO2 Flushed | CO2 Flushed | (%) | (%) | (%) | (%) | (%) | (%) |
| Cemented | 6.5 | −4.3 | 2.3 | 2.3 | — | 2.9 | High permeability no. 1 | 10.2 | −8.3 | 7.7 | — | 10.5 | 7.7 | High permeability no. 2 | 8.3 | −6.4 | 8.7 | 9.7 | 10.3 | 9.1 | Lower permeability no. 1 | 6.4 | −5.2 | 5.0 | 5.9 | 5.3 | 5.7 | Lower permeability no. 2 | 6.9 | −5.5 | 3.4 | 3.9 | — | 4.4 |
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