Neutron-Density Combination Porosity: Gas detection
In gas bearing formations, a combination is made between the values obtained from neutron and density logs. For those who know about wells, it is known that when the curves of both logs cross between (crossover), we can infer the presence of a gas accumulation, although other paramaters neeed to be taken into account like well bore conditions (caliper log), among others. The expression is the following:
- Where:
- ɸNDgas= gas bearing formations porosity
- ɸN= neutron log porosity
- ɸD= density log porosity
| Calculate Neutron-Density Combination Porosity (ɸnd) | |||
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The following equation also allow us to obtain a similar value to the first equation:
| Calculate Porosity - Density- Neutron (2) (ɸnd) | |||
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