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Fracture Properties Needed. Fracture porosity & permeability are both a function of Fracture Width (e) & Fracture Spacing (D). Fracture Porosity. Fracture Porosity Magnitude. Fracture Porosity is Difficult to Calculate and Even More Difficult to Interpret.

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Presentation Transcript
slide2

Fracture porosity & permeability

are both a function of

Fracture Width (e)

&

Fracture Spacing (D)

slide5

Fracture Porosity is

Difficult to Calculate

and

Even More Difficult to

Interpret

while fracture porosity is small in magnitude
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
slide7

Fracture System Volume as a Function

of Fracture Porosity & Drainage

Nelson (1985)

slide8

Fracture

Porosity

& Scale

2 ft

Nelson (1985)

slide9

Depth & Depletion Corrections

Are Much More Severe

in Fracture Porosity

Than in Matrix Porosity

slide11

Fracture & Matrix Permeability

Compressibility

Tr Ss from Daw & Others (1974)

slide15

Fracture Porosity vs.

Fracture Permeability

Nelson (1985)

slide16

K. North Sea

Chalk

Valhall Field

Fracture

Porosity/

Permeability

Relationship

Nelson (1985)

slide17

Fracture Porosity from Outcrop

Fracture Intensities

Nelson

(1985)

Assumes Fracture Width for Ls at 10,000 ft from Lab Measurements

slide18

Sometimes Fracture

Porosity & Matrix

Porosity are Related

slide19

Calcite Filled Vessicle Trains

Surrounding Fractures in Tert. Basalt

West Rozel, Great Salt Lake, Utah

slide20

Matrix Saturation Around Fractures

in Tert. Basalt

Calcite fill in Outcrop

West Rozel, Great Salt Lake, Utah

slide21

Calcite Along Vessicle Trains Along

Fractures in Basalt

West Rozel, Great Salt Lake, Utah