Synthetic fluid inclusions: IX. Critical PVTX properties of NaCl-H 2 O solutions

Details Synthetic fluid inclusions: IX. Critical PVTX properties of NaCl-H 2 O solutions Synthetic fluid inclusions: IX. Critical PVTX properties of NaCl-H 2 O solutions

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53....3k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 1, pp.3-8

Computer Science

14

Scientific paper

Critical PVTX properties of NaCl-H 2 O fluids having compositions of 0-30 wt% NaCl have been determined using the synthetic fluid inclusion technique. Critical temperatures and pressures increase from 374.1°C and 220 bars for pure H 2 O, to 820°C and 1574 bars for 30.0 wt% NaCl. Critical specific volumes decrease from 3.11 to 1.44 cm 3 /g over this same salinity range. Critical temperatures of NaCl-H 2 O fluids over the range 0-30 wt% NaCl are described by the equation T = 374.1 + 8.800 + 0.1771 2 - 0.02113 3 + 7.334·10 -4 4 where T is the critical temperature in degrees Celsius (±4.0°C) and is fluid composition in weight percent NaCl. The critical pressure, determined from the intersection of the critical isochore with the critical temperature in P - T space, is expressed as a function of the critical temperature according to the relationship P = 2094 - 20.56 T + 0.06896 T 2 - 8.903 × 10 -5 T 3 + 4.214·10 -8 T 4 where P is the critical pressure in bars (±21 bars) and T is the critical temperature in degrees Celsius. The critical specific volume is given as SV = 3.106 - 0.5967 - 0.01066 2 + 0.01267 3 where SV is the critical specific volume in cm 3 /g (± 0.02 cm 3 /g) and is related to the salinity as = ln ( wt % NaCl + 1) The slopes ( P / T ) of P - T projections of the critical isochores increase regularly with increasing salinity, from ~2.8 bars/°C for pure H 2 O to ~6.8 bars/°C for a 30 wt% NaCl solution.

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