Gassmann Fluid Substitution
This process calculates new density, P-velocity, and S-velocity curves using the Gassmann Equation. Gassmann is an equation to derive P-velocity, S-velocity and density in a rock medium in which the original fluid was replaced by another fluid (fluid substitution).
- In the Control Panel, go to View > New Single Well View.
- In the Single Well window, open the Process tab.
- At the tab header, click the blue "+" icon.
- Click on Gassmann Fluid Substitution.
- Type a name for the process and click OK.
Configure the Gassmann Fluid Substitution process
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Input
- Curves: Select the required P Velocity, S Velocity, Density, and Porosity curves.
- Reservoir interval: Input the Start and Stop values (in MDKB) to set the interval over which to perform the fluid substitution.
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In situ fluids:.
- Reservoir type: Specify the in-situ fluid expected in the recorded well data.
- Saturation: Specify the expected in-situ saturation (in percentage, %) of water and the specified fluid that is expected in the recorded well data.
- Fluid properties: Specify the properties (density and bulk modulus) of each fluid to match recorded well fluid properties.
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Matrix properties:
- Rock Type: Select the basic rock type for use as the mineral matrix. This should match the estimated well lithology.
- Density: Specify the density to be used for the selected rock type.
- Bulk modulus: Specify the bulk modulus to be used for the selected rock type.
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Substitution fluids:.
- Reservoir type: Specify the replacement fluid.
- Saturation: Specify the replacement saturation (in percentage, %) of water and the substitution fluid.
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Output
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Curves
- Enable custom name: Specify the name of the output curves. Each curve will be named as "[output class]_[process name]" by default, or if a custom name is supplied, "[output class]_[custom name]".
- Extent: Specify the extents of the output curves.
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Curves
