Calculate Resistivity porosity - Flushed Zone - Residual Hydrocarbons Correction

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Resistivity derived porosity - Flushed Zone - Residual Hydrocarbons Correction

For the calculation of resistivity derived porosity at the flushed zone, there are cases where a residual hydrocarbons correction needs to be made. In this case, water saturation of an uninvaded zone and the saturation exponent valuesneed to values must be known. The expression is summarized as the following:

Where:
• ɸ= porosity
• a= tortuosity factor
• Sw= water saturation of the uninvaded zone
• m= cementation exponent
• n= saturation 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 Resistivity Porosity (ɸ) - Flushed Zone- Residual Hydrocarbons Correction
a:		Rmf: ohm-m
Rxo: ohm-m		Sw: Decimal
n:		m:

Made by Henry Herrera