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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
2005. The American Association of Petroleum Geologists. All rights reserved.
DOI:10.1306/03100504040
Chlorine isotope
residual
salt analysis: A new tool to investigate formation waters from core analyses
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V. Woul
Ebongu
,1 N. Jendrzejewski,2 F. Walgenwitz,3 F. Pineau,4 M. Javoy5
1Laboratoire de Gochimie des Isotopes Stables, Institut de Physique du Globe, Universit
Paris 7, 2 Place Jussieu, 75251 Paris Cedex 05, France
2Laboratoire de Gochimie des Isotopes Stables, Institut de Physique du Globe, Universit
Paris 7, 2 Place Jussieu, 75251 Paris Cedex 05, France
3Total, Centre Scientifique et Technique Jean-Fger, Avenue Larribau, 64018 Pau Cedex, France
4Laboratoire de Gochimie des Isotopes Stables, Institut de Physique du Globe, Universit
Paris 7, 2 Place Jussieu, 75251 Paris Cedex 05, France
5Laboratoire de Gochimie des Isotopes Stables, Institut de Physique du Globe, Universit
Paris 7, 2 Place Jussieu, 75251 Paris Cedex 05, France
ABSTRACT
This article presents the first results of chlorine residual
salt analysis (Cl-RSA), a new technique that allows investigation of the isotopic composition of chlorine in oil-field waters from core analysis. As water evaporates, the
residual
salts precipitate in the pores of a core. Unlike the routinely used strontium isotope
residual
salt analysis (Sr-RSA) technique, which determines the composition of a trace element (strontium), the Cl-RSA technique allows the determination of the isotopic composition and origin of one of the most abundant anions in natural waters. The results show that combining the
37Cl of two successive leachates of a core sample leads to an isotopic composition that is representative of pore water. The reproducibility of the method applied to sandstone samples is considered to be
0.05
. The Cl-RSA technique was tested on two wells from the Elgin area (North Sea, United Kingdom). The
37Cl results in formation waters range from
1.03 to
0.57
, with an overall increase with depth. These results have been compared to the 87Sr/86Sr ratios of pore waters determined in the same wells using the Sr-RSA technique. The similarity of form between the
37Cl and 87Sr/86Sr profiles with depth confirms that
residual
salts permit a reliable investigation of the chlorine isotopic composition from core analysis. As with the Sr-RSA technique, Cl-RSA could be used to test the isotopic homogeneity of a sample and to assess the compartmentalization of oil fields and reservoirs. This technique could provide key information regarding the origin of the salinity and its evolution during the reservoirs' filling, as well as help in the monitoring during field production.
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