Shale Volume from the Spontaneous Potential
The algebraic formula to solve for shale volume from the SP log is a linear interpolation between the minimum and maximum log readings, similar to the GR solution.
VSHsp = (SP - SP0) / (SP100 - SP0)
Shale Volume from ALPHA Method
3: VSHpsp = ALPHA = PSP / SSP
This formula is no longer commonly used.
1. Vsh from spontaneous potential log:
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