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Thursday, March 15, 2018

The isometric log-ratio (ilr)-ion plot: A proposed alternative to the Piper diagram

Outside Publication: Journal of Geochemical Exploration
The Piper diagram has been a staple for the analysis of water chemistry data since its introduction in 1944. It was conceived to be a method for water classification, determination of potential water mixing between end-members, and to aid in the identification of chemical reactions controlling a sample set...

Wednesday, January 10, 2018

2017 Updates of the National Produced Waters Geochemical Database and Map Viewer

Website News
The USGS has released v2.3 of the National Produced Waters Geochemical Database and Map Viewer. This U.S. Geological Survey (USGS) Produced Waters Geochemical Database, which contains geochemical and other information for 114,943 produced water and other deep formation water samples of the United States, is an updated version of the 2002...


Monday, June 26, 2017

Assessment of water and proppant quantities associated with petroleum production from the Bakken and Three Forks Formations, Williston Basin Province, Montana and North Dakota, 2016

USGS Publication: Fact Sheet 2017-3044
The U.S. Geological Survey (USGS) has completed an assessment of water and proppant requirements and water production associated with the possible future production of undiscovered oil and gas resources in the Three Forks and Bakken Formations (Late Devonian to Early Mississippian) of the Williston Basin Province in Montana and North Dakota...

Wednesday, May 31, 2017

Methane and Benzene in Drinking-Water Wells Overlying the Eagle Ford, Fayetteville, and Haynesville Shale Hydrocarbon Production Areas

Outside Publication: Environmental Science & Technology
Water wells (n = 116) overlying the Eagle Ford, Fayetteville, and Haynesville Shale hydrocarbon production areas were sampled for chemical, isotopic, and groundwater-age tracers to investigate the occurrence and sources of selected hydrocarbons in groundwater...

Wednesday, March 01, 2017

Geochemistry and hydrology of perched groundwater springs: assessing elevated uranium concentrations at Pigeon Spring relative to nearby Pigeon Mine, Arizona (USA)

Outside Publication: Hydrogeology Journal
The processes that affect water chemistry as the water flows from recharge areas through breccia-pipe uranium deposits in the Grand Canyon region of the southwestern United States are not well understood. Pigeon Spring had elevated uranium in 1982 (44 μg/L), compared to other perched springs...

Monday, January 23, 2017

Data cleaning methodology for monthly water-to-oil and water-to-gas production ratios in continuous resource assessments

USGS Publication: Open-File Report 2016-1204
Petroleum production data are usually stored in a format that makes it easy to determine the year and month production started, if there are any breaks, and when production ends. However, in some cases, you may want to compare production runs where the start of production for all wells starts at month one regardless of the year the wells started producing...

Monday, December 12, 2016

Environmental signatures and effects of an oil and gas wastewater spill in the Williston Basin, North Dakota

Outside Publication: Science of The Total Environment
Wastewaters from oil and gas development pose largely unknown risks to environmental resources. In January 2015, 11.4 M L (million liters) of wastewater (300 g/L TDS) from oil production in the Williston Basin was reported to have leaked from a pipeline, spilling into Blacktail Creek, North Dakota...

Wednesday, October 19, 2016

Environmental Drivers of Differences in Microbial Community Structure in Crude Oil Reservoirs across a Methanogenic Gradient

Outside Publication: Frontiers in Microbiology
Stimulating in situ microbial communities in oil reservoirs to produce natural gas is a potentially viable strategy for recovering additional fossil fuel resources following traditional recovery operations. Little is known about what geochemical parameters drive microbial population dynamics in biodegraded, methanogenic oil reservoirs...

Wednesday, October 19, 2016

Impact of formation water geochemistry and crude oil biodegradation on microbial methanogenesis

Outside Publication: Organic Geochemistry
Converting non-producible crude oil to CH4 via methanogenic crude oil biodegradation in oil reservoirs could serve as one way to increase our energy profile. Yet, field data supporting the direct relationship between methanogenesis and crude oil biodegradation are sparse...

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