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.

Many thanks!
Kit

Can’t help directly – not a petrophysicist but that sounds very saline. If you have an Rw can you not get some actual measurements from the core sample?

This gives up to 300,000 ppm, and you might find a useful calculator here.

Unfortunately I don’t have access to core samples, and in any case I need to make salinity estimates for c. 200 fields 😕 (PhD project, in case you’re wondering!)

edit: thanks FlyingOx. First link is to the Schlumberger chart I already have, but second link looks useful, cheers.