Water Saturation (Sw) - Ferlt (1975)

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Water Saturation (Sw) - Ferlt (1975)

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)
ɸ (dec)		Rw (ohm-m)
Rt (ohm-m)		a
Vsh (dec)

Results

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Water Saturation (Sw) - Results
ɸ (dec)	Rw (ohm-m)	Rt (ohm-m)	a	Vsh (dec)	Sw (dec)	Sw (%)
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Made by Henry Herrera