Resistivity derived porosity (Sw= 1)
In water bearing zones, where water saturation equals a 100% (Sw= 1), Archie's equation for resistivity derived porosity, is shorten because it is not neccesary to use water saturation because equals 1, neither the saturation exponent, and it is simplified as the following expression:
- Where:
- ɸ= porosity
- Rw= resistivity of formation water at formation temperature
- Rt= true formation resistivity (i.e., deep induction or deep laterolog corrected for invasion)
- a= tortuosity factor
- m= cementation exponent
| Calculate Resistivity derived porosity (ɸ) - Sw = 1 | |||
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