Physics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51...45c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 51, Issue 1, pp.45-53
Physics
10
Scientific paper
Oil-field waters produced from Mississippian carbonate reservoir rocks in Bindley field, Kansas had an average salinity of about 42.8 mg/l. They were enriched in Ca, Sr, Na, K, Rb, and Li and depleted in Mg relative to sea water at the same level of either Cl or Br concentration. The average abundances of different elements are as follows: Na--13,460 mg/l, K--325 mg/1, Rb--0.9 mg/l, Li--12 mg/l, Ca--1,515 mg/l, Sr--42 mg/l, Mg--430 mg/l, Cl--23,000 mg/l, SO 4 --2,630 mg/l, Br--32 mg/l. The 87 Sr / 86 Sr values of the waters ranged between 0.7221 and 0.7230, whereas the values of the host carbonate rocks were between 0.7090 and 0.7093. The very high 87 Sr / 86 Sr values of the waters probably occurred as a result of their reaction with alkali feldspar minerals in buried Precambrian crystalline rocks to the east of the Bindley field. The study demonstrates that despite their residence in carbonate reservoir rocks oil-field waters can retain sufficiently distinct isotopic memory that may provide important dues about mineral-water interactions in the chemical evolutionary history of the waters. The study further indicates that very late diagenetic reactions in many carbonate rocks are of minor extent. Difference in the Sr isotopic data among the oil-field waters suggests that the Sr isotopic data can be used as a reliable guide in recognising existence of separate pools in an oil field.
Broedel V.
Chaudhuri Sambhudas
Clauer Norbert
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