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→Analytical methods
===Analytical methods===
===Analytical methods===
<gallery mode=packed heights=300px widths=300px>
<gallery mode=packed heights=300px widths=300px>
oilfield-water-analysis_fig1.png|{{figure number|1}}Triangular plot showing relative amounts of cations in typical oil field brines. Relative amount of sodium changes, but calcium is always about five times magnesium. (After Dickey.<ref name=pt05r46>Dickey, P. A., 1966, [http://archives.datapages.com/data/bulletns/1965-67/data/pg/0050/0011/2450/2472.htm Patterns of chemical composition of deep subsurface waters: AAPG Bulletin, v. ]50, p. 2472–2478.</ref>)
oilfield-water-analysis_fig1.png|{{figure number|1}}Triangular plot showing relative amounts of cations in typical oil field brines. Relative amount of sodium changes, but calcium is always about five times magnesium. (After Dickey.<ref name=pt05r46>Dickey, P. A., 1966, [http://archives.datapages.com/data/bulletns/1965-67/data/pg/0050/0011/2450/2472.htm Patterns of chemical composition of deep subsurface waters: AAPG Bulletin], v. 50, p. 2472–2478.</ref>)
file:oilfield-water-analysis_fig2.png|{{figure number|2}}Stiff<ref name=pt05r149 /> diagrams used to show water compositions on maps.
file:oilfield-water-analysis_fig2.png|{{figure number|2}}Stiff<ref name=pt05r149 /> diagrams used to show water compositions on maps.
</gallery>
</gallery>