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Fracture Properties Needed. Fracture porosity & permeability are both a function of Fracture Width (e) & Fracture Spacing (D)

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Presentation on theme: "Fracture Properties Needed. Fracture porosity & permeability are both a function of Fracture Width (e) & Fracture Spacing (D)"— Presentation transcript:

1 Fracture Properties Needed

2 Fracture porosity & permeability are both a function of Fracture Width (e) & Fracture Spacing (D)

3 Fracture Porosity

4 Fracture Porosity Magnitude

5 Fracture Porosity is Difficult to Calculate and Even More Difficult to Interpret

6 While Fracture Porosity is Small in Magnitude It is very effective porosity A possible large volume per well due to large drainage area and reservoir thickness An assumed high recovery factor

7 Fracture System Volume as a Function of Fracture Porosity & Drainage Nelson (1985)

8 FracturePorosity & Scale & Scale 2 ft Nelson (1985)

9 Depth & Depletion Corrections Are Much More Severe in Fracture Porosity Than in Matrix Porosity

10 Fracture & Matrix Porosity Compressibility

11 Tr Ss from Daw & Others (1974) Fracture & Matrix Permeability Compressibility

12 Fracture Porosity Calculator Nelson (1985)

13 Fracture Porosity Determinations

14 Fracture Porosity from Core Analysis

15 Fracture Porosity vs. Fracture Permeability Nelson (1985)

16 FracturePorosity/PermeabilityRelationship K. North Sea Chalk Valhall Field Nelson (1985)

17 Fracture Porosity from Outcrop Fracture Intensities Assumes Fracture Width for Ls at 10,000 ft from Lab Measurements Nelson (1985)

18 Sometimes Fracture Porosity & Matrix Porosity are Related

19 Calcite Filled Vessicle Trains Surrounding Fractures in Tert. Basalt West Rozel, Great Salt Lake, Utah

20 Matrix Saturation Around Fractures in Tert. Basalt West Rozel, Great Salt Lake, UtahCalcite fill in Outcrop

21 Calcite Along Vessicle Trains Along Fractures in Basalt West Rozel, Great Salt Lake, Utah


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