Calculate Water Saturation (Sw)- Schlumberger (1975)

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List of equations assignment

Water Saturation (Sw)- Schlumberger (1975)

Schlumberger (1975) also proposed an equation to calculate water saturation, and the parameters included in that expression are very similar to the ones used in Ferlt's equation (1975), but adding a different parameter: a shale/clay resistivity value. The similar parameters are shale volume, porosity, water resistivity, and true formation resistivity. 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
• Rshale= shale/clay resistivity value in a formation

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

Made by Henry Herrera