Calculate Water Saturation (Sw) - Archie (1942)

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Water Saturation (Sw) - Archie (1942)

Archie's equation is one of the most known ways to calculate water saturation. This author included in his equation different physical rock properties and measurements from different well logs like tortuosity, water and formation resistivities, saturation exponent, and porosity. The equation is the following:

Where:
• Sw= water saturation of the uninvaded zone
• Rt= true formation resistivity (i.e., deep induction or deep laterolog corrected for invasion)
• Rw= resistivity of formation water at formation temperature
• ɸ= porosity
• a= tortuosity factor
• m= cementation exponent
• n= saturation exponent

Calculate Water Saturation (Sw) - Archie (1942)
a:		Rw: ohm-m
Rt: ohm-m		ɸ: Decimal
m:		n:

Made by Henry Herrera