Calculate Water Saturation (Sw) - Ferlt (1975)

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Water Saturation (Sw) - Ferlt (1975)

Among the equations for the calculation of water saturation, we find Ferlt's equation (1975). This one includes the values of porosity, water resistivity, true formation resistivity, shale volume, and a constant "a", which its value is known for certain zones. 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
• Vshale= shale volume
• a= 0.25 at the Golf Coast
• a= 0.35 at the Rocky Mountains

Calculate Water Saturation (Sw) - Ferlt (1975)
ɸ: Decimal		Rw: ohm-m
Rt: ohm-m		a:
Vsh: Decimal

Made by Henry Herrera