Fracture Properties Needed

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Presentation transcript:

Fracture Properties Needed

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

Fracture Porosity

Fracture Porosity Magnitude

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

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

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

Fracture Porosity & Scale 2 ft Nelson (1985)

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

Fracture & Matrix Porosity Compressibility

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

Fracture Porosity Calculator Nelson (1985)

Fracture Porosity Determinations

Fracture Porosity from Core Analysis

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

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

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

Sometimes Fracture Porosity & Matrix Porosity are Related

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

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

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