Fluid flow and geochemistry of the Mississippian aquifers in the Williston Basin, Canada-U.S.A | Posted on:2008-12-13 | Degree:M.Sc | Type:Thesis | University:University of Alberta (Canada) | Candidate:Jensen, Gavin Kenneth Soren | Full Text:PDF | GTID:2440390005467276 | Subject:Geology | Abstract/Summary: | | Water samples collected from 114 producing wells in Mississippian aquifers across the Williston Basin. Results reveal large variations in geochemical and isotopic compositions basin wide. Results show: (i) formation waters have distinct chemical fingerprints; (ii) large variations in isotopic compositions indicate variable flow pathways within the aquifers; (iii) portions of the aquifers host formation waters with a composition similar to original Mississippian seawater. Two separate flow regimes are present in the Mississippian aquifers. One flow regime originates from present-day meteoric water that evolved into a saline brine by halite dissolution and subsequent mixing with a residual brine. The other flow regime originates from a large scale fluid flux occurring at the end of the Cretaceous, that evolved into a saline brine via halite dissolution. These new geochemical data indicate the Mississippian flow system is not a simple regional groundwater flow system, rather highly-variable across the basin. | Keywords/Search Tags: | Mississippian, Basin, Flow | | Related items |
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