Most of AFA Predico physics based models also use the basic petrophysical and/or volumetric inputs. Of course, some of these values are determined from the analysis and/or history matching process. The typical list of parameters is provided below.
If layered reservoirs, there may be multiple instances of each variable.
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Decline & Ratio Methods |
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Abandonment Production Rate |
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Abandonment Water Cut |
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Parameters Common to Physics Models (autoFMB, autoRTA, TAHK, KOLDUN, P/z) |
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Initial Pressure |
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Net Pay or Net Pays for layers |
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Formation Depth |
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Porosity or cleat porosity |
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Saturations (Sw, Sg, So) |
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Basic PVT: minimum Gas Gravity for Gas; Bubble Point/API for Oil; |
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Basic well info (depth + wellbore radius + tubing/casing ID) |
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Formation Temperature |
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Drainage Area |
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Additional Information for Unconventional Resources: Shake or CSG/CBM |
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Desorption Pressure |
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Langmuir Parameters (VL and PL) |
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Multiphase Scenarios |
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Relative Permeability Curves |