Page 167 - Geochemistry of Oil Field Waters

154 INORGANIC CONSTITUENTS AND PHYSICAL PROPERTIES

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200
Normal evaporite curve, / %

TT
a
50
0 J
I
"k/~ / c C" T
" 30
c
J
T

BORON,mg/I

Fig. 5.13. Comparison of the boron concentrations of some Tertiary (T), Cretaceous (C),
and Jurassic (J) age formation waters from Louisiana with an evaporating sea water.

I P

BORON, mg/l

Fig. 5.14. Comparison of the boron concentrations of some waters from Pennsylvanian
(P) and Mississippian (M) age sediments with an evaporating sea water.

indicates that the majority of these brines are enriched in boron relative to a
normal evaporite-formed brine, and that the samples that were depleted in
boron may have contained dissolved halite. Fig. 5.14 is a similar plot for some
samples taken from some Pennsylvanian and Mississippian age sediments.
Boron is one of the elements whose concentration in the aqueous phase
increases as a brine is evaporated, as illustrated in Table 5.11.