Calculate Resistivity derived porosity (ɸ) - Flushed Zone Rxo

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List of equations assignment

Resistivity derived porosity (ɸ) - Flushed Zone Rxo

At the flushe zone, resistivity derived porosity can also be calculated. In this case, resistivity of the mud filtrate at formation temperature must be know and the shallow resistivity from a very shallow reading device, besides the tortuosity and cementation exponent values. The equation is expressed the following way:

Where:
• ɸ= porosity
• a= tortuosity factor
• m= cementation exponent
• Rmf= resistivity of the mud filtrate at formation temperature
• Rxo= shallow resistivity from a very shallow reading device such as lateolog-8, microspherically focused log, or microlaterolog

Calculate Porosity (ɸ)
a:		Rmf: ohm-m
Rxo: ohm-m		m:

Made by Henry Herrera