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What is the unit of Salt Mass Fraction (Xsm) in Initial Conditions in PetraSim

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What is the unit of Salt Mass Fraction (Xsm) in Initial Conditions in PetraSim? I search online and read menu but I can not find the answer. It is the moles of salt in moles of water, or gram of salt in grams of waters? 

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The primary variable Xsm is used in the EWASG EOS module. Depending on its value, it can be (see the TOUGH2 V.2.0 user's guide (Pruess et al., 1999) pag. 55-56):

- XS,  the mass fraction of NaCl in the aqueous phase (0-1);

- SS+10, the solid salt saturation (10-11).

 

With the same meaning Xsm is also used in the old ECO2 and in ECO2N.

 

Starting with Petrasim 2017, in EWASG XS can be the mass fraction of NaCl in either the aqueous or gas phase, as the very small solubility of salt in the water vapor is accounted for.  

In practice: XS = kg NaCl over kg solution, that is kg of NaCl+water+NCG.

 

Alfredo

 

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