Geology Fracture Porosity Calculator
Actual area×aperture fracture inventory with mapped overlap subtraction, not inferred permeability. Caller independently establishes matching units, evidence, method edition and applicability; output is not compliance, diagnosis, work-safety approval, geological identity or validated hazard prediction.
Description
Fracture porosity compares an estimated fracture void volume with the bulk volume containing it.
Fracture porosity compares an estimated fracture void volume with the bulk volume containing it.1
Correcting overlap prevents the same intersecting void space from being counted repeatedly. Use this tool to calculate fracture porosity from the supplied measurements and assumptions.
When to use Geology Fracture Porosity Calculator
Use this tool to calculate fracture porosity from the supplied measurements and assumptions. Establish the measurement units, sampled interval, calibration or model edition and geological assumptions before entering data.
How to use Geology Fracture Porosity Calculator and understand its results
- Establish the measurement units, sampled interval, calibration or model edition and geological assumptions before entering data.
- Enter fractureAreasM2, openAperturesM, independentOverlapVolumeM3, bulkVolumeM3, using the field meanings and rules below, then run the tool.
- Read fracturePorosity. Interpret the fields using their units, signs and evidence conventions below.
- If input validation fails, correct the reported field and run again. Before applying the result, check reference scope, model assumptions and any missing evidence or placeholder values.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| fractureAreasM2 | Fracture areas m2 | list of number | Required |
| openAperturesM | Open apertures m | list of number | Required |
| independentOverlapVolumeM3 | Independent overlap volume m3 | number | Required |
| bulkVolumeM3 | Bulk volume m3 | number | Required |
Enter nonempty aligned positive fracture areas and nonnegative open apertures, nonnegative overlap volume and positive bulk volume. Subtract overlap from the summed area×aperture void volume. Require the corrected void volume to lie from zero through bulk volume, then divide by bulk volume.
porosity=(Σarea_i×aperture_i−overlapVolume)/bulkVolume Use the exact units, boundary rules, ordering and missing-evidence conventions above.
| Output field | Meaning | Value type |
|---|---|---|
| fracturePorosity | Fracture Porosity; follow the units, sign, ordering and evidence convention stated above | number |
{
"input": {
"fractureAreasM2": [
1,
2
],
"openAperturesM": [
0.01,
0.02
],
"independentOverlapVolumeM3": 0.005,
"bulkVolumeM3": 1
},
"output": {
"fracturePorosity": 0.045000000000000005
}
}Limitations and assumptions
Correcting overlap prevents the same intersecting void space from being counted repeatedly. Interpretation depends on the units, sampling scope and exact model described above.
All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse evidence arrays fail validation; the specific bounds and alignment requirements are stated above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful result reporting false, no matches or missing evidence.
Alternative or Complementary methods
Use Geology Effective Porosity Calculator for this related task: Effective porosity excludes independently estimated dead-end volume from a supplied connected pore volume.
Use Geology Petrophysical Borehole Image Fracture Density Calculator when its separate inputs and assumptions fit the question: A borehole-image fracture density expresses counted intersections per effectively observed length.
References
-
Geology Fracture Porosity Calculator — tool.io
Similar or alternative tools
- Geology Effective Porosity Calculator
Effective porosity excludes independently estimated dead-end volume from a supplied connected pore volume.
- Geology Petrophysical Borehole Image Fracture Density Calculator
A borehole-image fracture density expresses counted intersections per effectively observed length.