Inverse modeling of test SB4-VM2/216.7 at Wellenberg Page: 4 of 51
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Abstract
Pressure and flow rate data from a water sampling test, which also produced gas, at the
Wellenberg site are analyzed using inverse modeling techniques. Two conceptual models are
developed and used for parameter estimation. The first model assumes that the gas observed
at the surface is dissolved in the pore water under natural pressure and temperature conditions
and comes out of solution due to the pressure reduction during pumping. The second model
considers a mobile gas phase originally present in the formation. While both models are able
to explain the observed pressure response as well as the gas seen at the surface, large
uncertainties in the data and in the model assumptions inhibit the determination of two-phase
flow parameters. The analysis indicates, however, that the formation has a very low
permeability and that formation head is far below hydrostatic.
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Finsterle, S. Inverse modeling of test SB4-VM2/216.7 at Wellenberg, report, March 1, 1994; California. (https://digital.library.unt.edu/ark:/67531/metadc1310255/m1/4/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.