Calculate Resistivity Porosity

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List of equations assignment

Resistivity derived porosity (resistivity porosity)

Starting from the well known Archie's equation, regularly known better for water resistivity calculations, it is also used for the resistivity derived porosity. This equation includes the values of tortuosity factor, formation and water resistivities, water saturation, and saturation and cementation exponents, and the expression is the following:

Where:
• ɸ= porosity
• Sw= water saturation of the uninvaded zone
• 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
• n= saturation exponent

Calculate Resistivity derived Porosity (ɸ)
a:		Rw: ohm-m
Rt: ohm-m		Sw: Decimal
n:		m:

Made by Henry Herrera