9345765632
Doc. No.
Snohvit C02 Tubaen Fm. storage capacity and inj«ction strategy study
Valid from
Rev. no. 1.0
indicates that the velocity-pressure sensitivity is stronger than what the ultrasonic core measurements show (see following description).
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Figurę 54: Relative velocity change in the lowermost Tubaen formation, estimate from 4D time shift (left), using the equation above, and 4D reflectivity change (right), using the warped 4D difference divided by the base, and multipiied by the factor -0.18. The mismatch between the two estimates amounts to a factor of 2-4.
Fluid substitution. In the feasibility study ( ) a velocity drop of 3.7 % was predicted for a
CO; replacing brine scenario with 60 % CO; saturation. Since then, a shear wave velocity log was run in well 7121 /4-F-2 H and new ultrasonic core pług measurements were done in Tubaen 1 ( .see in
particular p. 27). and based on these a new fluid substitution study was performed. For saturation, standard Gassmann was used (for equations see ). Input fluid and matrix parameters are found
in Table 3-4. For initial reservoir pressure, the value 26.8 MPa was used (somewhat lower than the 29 MPa estimated in chapter 2.2.4), and a 60 bar pressure increase was used for the high case, giving a pressure of 32.8 MPa. For pressures between 26.8 MPa and 32.8 MPa, a linear interpolation of the CO; velocities and densities have
|
Component |
Bulk modulus (CPa) |
Velocity (m/s) |
Density (kg/mł) |
|
Tubaen 1 sand |
36 |
(p-p*»/(l ~(p) | |
|
Virgin brine (p») |
3.3 |
1740 |
1090 |
|
CO; (pressure 26.8 Mpa, 90° C) |
0.11 |
413 |
663 |
|
CO; (pressure 32.8 Mpa, 90° _Q_ |
0.17 |
481 |
732 |
Classification: Intemal Status: Draft Expiry datę: 2012-12-31 Page 64 of 1 32
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