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74 WATER
Fig. 4.2. Reservoir-rock productivity as determined from capillary pressure and relative permeability
curves (modified after J. J. Arps by R. L. Jodry, in: Chilingar et al., 1972, p. 53). Smallest pore throats
effective at any pressure level are shown on scale to the right of capillary pressure curve.
portion of molecules leave the frame and move into the pores, thereby increasing the
water density.
The structure of water solutions depends on the structure of water and the
dissolved substances. There may be a positive and negative hydration. The former
one increases, whereas the latter decreases the n-bonds in solution. The solubility of
