The Porosity wizard calculates total and effective porosity using available well logs such as density, neutron, or a combination of both.
The tool can be applied to a single well or in batch mode, allowing users to process all wells or selected wells from the Data Manager.
Input Parameters
•Well selection: Choose one well or enable Batch calculation to process multiple wells or a well group from the Data Manager.
•Depth filter: The calculation interval can be limited by MD, TVD/TVDSS, or markers.
•Curve selection: Choose the density, neutron, or shale volume logs depending on the selected method.
•Material properties: Specify matrix and fluid densities (and shale porosity if applicable).
•Output curve: Define the name of the resulting porosity log. The name can be edited directly in the wizard before saving.
Calculation Methods
Density Porosity – Total
Calculates porosity directly from the density log assuming a clean (shale-free) formation.
Use:
•For clean formations with minimal shale influence.
•Common for sandstone and carbonate reservoirs.
ρma – matrix density,
ρf – fluid density,
ρlog – measured formation density.
Density Porosity – Effective
Corrects the total porosity for shale content using a shale volume curve and shale porosity.
Use:
•Appropriate for shaly formations.
•Produces an effective porosity excluding bound water in shale.
Vsh – shale volume,
ϕsh – shale porosity.