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Geochemistry of Some Petroleum-Associated Waters from Louisiana.

PB189538

Publication Date	1970
Personal Author	Collins, A. G.
Page Count	36
Abstract	Some of the geochemical relationships that exist between subsurface fluids and the associated geologic strata in petroleum producing areas of Louisiana have been determined. Samples of petroleum-associated water were obtained from 126 wells in Louisiana that produced from sediments of three geologic ages: Tertiary, Cretaceous, and Jurassic. The samples were transported to a central laboratory for analysis of chemical composition, using standard methods, to determine if the compositions varied with the geologic strata of their source and, if so, why. The dissolved constituents were compared with those of a brine that was concentrated by evaporation. The concentrations of bromide, calcium, and strontium were useful in distinguishing the brines produced from sediments of a late age from those of an earlier age. The concentration ratios of Mg' (total equivalent magnesium) and bromide indicated that dolomitization probably had occurred and altered the composition of the brines. A principal-components analysis of the data indicated an inverse relationship between depth and concentrations of bromide, strontium, calcium, and lithium. (Author)
Keywords	Geochemistry Water Petroleum Evaporation Louisiana Halides Geologic age determination Alkali metals Strontium
NTIS Subject Category	48F - Geology & Geophysics
Corporate Authors	BUREAU OF Mines, Washington, D.C.
Document Type	Technical Report
Title Note	Report of Investigations.
NTIS Issue Number	197008

Geochemistry of Some Petroleum-Associated Waters from Louisiana.

Geochemistry of Some Petroleum-Associated Waters from Louisiana.
PB189538

Publication Date	1970
Personal Author	Collins, A. G.
Page Count	36
Abstract	Some of the geochemical relationships that exist between subsurface fluids and the associated geologic strata in petroleum producing areas of Louisiana have been determined. Samples of petroleum-associated water were obtained from 126 wells in Louisiana that produced from sediments of three geologic ages: Tertiary, Cretaceous, and Jurassic. The samples were transported to a central laboratory for analysis of chemical composition, using standard methods, to determine if the compositions varied with the geologic strata of their source and, if so, why. The dissolved constituents were compared with those of a brine that was concentrated by evaporation. The concentrations of bromide, calcium, and strontium were useful in distinguishing the brines produced from sediments of a late age from those of an earlier age. The concentration ratios of Mg' (total equivalent magnesium) and bromide indicated that dolomitization probably had occurred and altered the composition of the brines. A principal-components analysis of the data indicated an inverse relationship between depth and concentrations of bromide, strontium, calcium, and lithium. (Author)
Keywords	Geochemistry Water Petroleum Evaporation Louisiana Halides Geologic age determination Alkali metals Strontium
NTIS Subject Category	48F - Geology & Geophysics
Corporate Authors	BUREAU OF Mines, Washington, D.C.
Document Type	Technical Report
Title Note	Report of Investigations.
NTIS Issue Number	197008