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. Difficult to Calculate
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. Fracture Porosity & Scale
2 ft
Nelson (1985)

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

10. Fracture & Matrix Porosity
Compressibility

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

12. Fracture Porosity Calculator
Nelson (1985)

13. Fracture Porosity Determinations

14. Fracture Porosity from Core Analysis

15. Fracture Permeability
Fracture Porosity vs.
Fracture Permeability
Nelson (1985)

16. Fracture Porosity/ Permeability Relationship
K. North Sea
Chalk
Valhall Field
Fracture
Porosity/
Permeability
Relationship
Nelson (1985)

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

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 Calcite fill in Outcrop
in Tert. Basalt
Calcite fill in Outcrop
West Rozel, Great Salt Lake, Utah

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