The abundance of natural arsenic in deep thermal fluids of geothermal and petroleum reservoirs in Mexico

Birkle, P. and Bundschuh, J. (2009) The abundance of natural arsenic in deep thermal fluids of geothermal and petroleum reservoirs in Mexico. In: Natural arsenic in groundwaters of Latin America. Arsenic in the Environment, 1. Taylor & Francis (CRC Press), London, United Kingdom, pp. 145-153. ISBN 9780415407717

Abstract

The lack of chemical similarity between thermal fluids in geothermal and petroleum reservoirs in Mexico indicates a distinct origin for arsenic (As) in both systems. Deep fluids from geothermal reservoirs along the Transmexican volcanic belt are characterized by elevated As concentrations, within an average range of 1 to 100 mg/l at a depth from 600 to 3000mb.s.l. The lack of correlation between As and salinity reflects the importance of secondary water-rock interaction processes. The predominance of As compared to Fe and Cu concentrations, and the abundance of secondary minerals in temperature-dependent hydrothermal zones, support this hypothesis. Oilfield waters from sedimentary basins in SE-Mexico show maximum As concentrations of 2 mg/l, at a
depth from 2900 to 6100 m b.s.l. The linear Cl−/As correlation for oilfield waters indicates that As
input occurs during the mixing between meteoric water and evaporated sea-water, and that there is only minor As derived from interaction with carbonate host rock.


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Item Type: Book Chapter (Commonwealth Reporting Category B)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright policy.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 05 Nov 2014 04:42
Last Modified: 12 Sep 2016 00:46
Uncontrolled Keywords: arsenic; geothermal resrvoirs; petroleum reservoirs; Mexico
Fields of Research : 05 Environmental Sciences > 0502 Environmental Science and Management > 050204 Environmental Impact Assessment
04 Earth Sciences > 0406 Physical Geography and Environmental Geoscience > 040603 Hydrogeology
URI: http://eprints.usq.edu.au/id/eprint/26260

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