Hiya, I’m trying to convert formation water resistivity from well logs to salinity. Currently I’m using a calculator which is based on the Schlumberger Gen-6 chart (http://www.rjzpetrophysics.com/html/links___software.html), but would like to know the underlying theory/calcs. Quick googling gives calcs that are only good to 42,000 ppm; I need up to and above 300,000 ppm.
Any recommendations on books, papers, etc. would be very helpful.