Geochemical identification of salinity sources at the Beard and Meats leases near Le Roy, Coffey County

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Authors:Whittemore, Donald O.
Author Affiliations:Primary:
Kansas Geological Survey, Lawrence, KS, United States
Source:Open-File Report - Kansas Geological Survey, No.94-10, 9p. Publisher: Kansas Geological Survey, Lawrence, KS, United States
Publication Date:1994
Note:In English. 2 refs.
Summary:The Kansas Corporation Commission (KCC) found saline waters in the shallow subsurface in the area of the Meats and Beard oil-field leases near Le Roy, Coffey County. The Meats scar is primarily within SW SW sec. 1 and the Beard scar mainly in the NW corner of sec. 12, T. 23 S., R. 16 E. The sites overlie alluvium of the Neosho River valley on the east side of the river. The area is well within the band of alluvium as delineated in the state geologic map suggesting that naturally saline water from the bedrock is not a probable source. The bedrock underlying the alluvium and forming the valley wall over two miles to the northeast comprises shale and sandstone of the Pennsylvanian Douglas Group. Most probable sources of shallow salinity are concentration of dissolved solids by evapotranspiration (combined evaporation and plant transpiration) and oil-field brine. Many oil wells exist in the vicinity and produce from the "Squirrel sand" in the upper part of the Cabaniss Formation near the top of the Cherokee Group at depths of approximately 960-975 ft. Enhanced recovery of oil by waterflooding started in 1965 on the Pinon lease north of the Beard lease, in 1969 on the Beard lease, and in 1974 on the Meats lease. Waterflooding on the Pinon lease has involved adding water from a supply well in the Kansas City Group to the produced saltwater; the other leases use the water produced with the oil as the waterflood supply. The KCC requested the assistance of the Kansas Geological Survey (KGS) in identifying the source(s) of saltwater. The KCC collected a water sample from a borehole augered into a surface salt scar on each of the two leases. The two salt scars are about 0.5 mile apart. The saline water sample from the Beard lease is designated as BE1 (Table 1) and was obtained from a 4 ft deep borehole in clay loam at a naturally low-lying area. The KCC also collected a sample (BE2) from a borehole augered in a soybean field at a location about 150 ft south of and a surface elevation approximately 1.5-2 ft higher than for borehole BE1. The saline water (ML1) from the Meats lease was collected from a 2 ft borehole in silty loam. Sample ML2 was obtained from a borehole in silty loam about 200 ft upslope of ML1. The samples were sent along with an oil-field brine sampled from the saltwater tank on the Meats lease. The saltwater in the tank is a mixture of brines produced from many oil wells on the lease in the W/2 SW sec. 1, T. 23S., R. 16 E. The KGS determined the saltwater source using the geochemical methods of Whittemore (1984, 1988). The procedure involved measuring the specific conductance, and chloride, sulfate, and bromide concentrations in the samples and identifying the salinity source based on constituent ratios and mixing curve graphs.
Subjects:Adsorption; Alluvium aquifers; Aquifers; Boreholes; Brines; Bromide ion; Bromine; Carboniferous; Cherokee Group; Chloride ion; Chlorine; Desmoinesian; Evapotranspiration; Geochemistry; Ground water; Halogens; Hydrochemistry; Hydrology; Middle Pennsylvanian; Mixing; Oil wells; Paleozoic; Pennsylvanian; Pollution; Precipitation; Salinity; Solutes; Sulfate ion; Variations; Water pollution; Water wells; Waterflooding; Coffey County Kansas; Kansas; Neosho River valley; United States; Beard Lease; Le Roy Kansas; Meats Lease
Coordinates:N380500 N382500 W0953000 W0955500
Record ID:2018061884
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute.
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