Simulate Aging
The Simulate Aging app simulates the aging process creating a mixed-wet rock structure as shown in Arnold et al. (2023).
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Modules needed to run this GeoApp (depending on the selected options):
PoroDict, GrainGeo
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Click Edit to open the Simulate Aging Parameters dialog.
Enter a Result File Name and select a name for the resulting mixed-wet structure. At the bottom of the dialog you can check Expert Settings and select to Clean up files to delete all intermediate results from the result folder.
There are three different Aging Methods selectable: Deterministic, Stochastic and Simple.
Deterministic
For a Deterministic aging method, the wettability is changed at surfaces in large pores and in contact with the invading oil/gas. Select materials for the Water Phase and the Oil/Gas Phase. The Volume of pore space considered defines the limit for the material reassignments to oil-rock surfaces in large pores. A geometric pore size distribution is applied to determine the pore space that allows consideration of oil-wet surfaces with adjusted contact angles. For example, a value of 70% means that the largest 70% of the pores are changed from water-wet to oil-wet. A higher percentage leads to more contact material changes and an increased saturation change during forced imbibition, while the saturation changes during spontaneous imbibition are decreased.
The aged material is visualized in red in the example below.
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Stochastic
The Stochastic aging method distributes the wettability using Gaussian random fields. Find more information about Gaussian Random fields in the GrainGeo user guide. Select a material for the Oil/Gas Phase. It is not necessary to select a water phase for this method, because the result is generated based on a Gaussian random field and not the water phase. Define the Desired Oil-Wet Region Size, representing the standard deviation for the applied Gaussian distribution. Additionally, enter the Desired Oil-Wet Solid Volume Percentage.
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Simple
The Simple aging method reassigns all non-wetting phase contacts with the rock to become non-wetting. Select materials for the Water Phase and the Oil/Gas Phase. Choose for which contact phases the surfaces should be aged, Oil/Gas Phase or Water Phase. Enter the Material ID of the Solid whose Wettability should be changed.
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