To estimate effective porosityUsing only neutron porosity to measure effective porosity for gas-saturated layers can be inaccurate because neutron logs are sensitive to gas effect. Using a combination of neutron and density logs or neutron and sonic logs is more accurate. This combination can also be used to generate a phi curve for unconsolidated sand formations.
To estimate effective porosity
1. Double-click the log or well header, not a curve or top.
The Single Well Properties: Porosity
dialog box appears.
2. Select the porosity tab, and from the effective porosity estimation method drop-down box, select either Combination Neutron Density or Combination Neutron Sonic.
3. In either the Combination Neutron-Density or the Combination Neutron-Sonic panes (depending on the Effective Porosity Estimation Method you selected above) select from the neutron and density or the neutron and sonic logs available in your cross section.
Note: If there are DPSS, DPSL, or DPDL curves
available in your cross section, you can generate effective porosity from
RHOB.
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