Peter B McMahon (Former Employee)
Science and Products
Filter Total Items: 14
Methane and benzene in drinking-water wells overlying the Eagle Ford, Fayetteville, and Haynesville Shale hydrocarbon production areas Methane and benzene in drinking-water wells overlying the Eagle Ford, Fayetteville, and Haynesville Shale hydrocarbon production areas
Groundwater samples were collected from domestic and public-supply wells in the Eagle Ford study area in 201516, in the Fayetteville study area in 2015, and in the Haynesville study area in 201415. One sample of produced water was collected from a gas well in the Haynesville Shale in Rusk County, Texas in 2010, and 5 samples of produced water were collected from oil and condensate wells...
Produced water chemistry for samples from four petroleum wells, southern San Joaquin Valley, California, 2014 Produced water chemistry for samples from four petroleum wells, southern San Joaquin Valley, California, 2014
The U.S. Geological Survey (USGS) in cooperation with the California State Water Resources Control Board collected produced water samples from four petroleum wells in the southern San Joaquin Valley on November 5, 2014. This digital dataset contains the site information, analyzing laboratories and methods, and water chemistry and quality control results for these samples. Water chemistry...
Filter Total Items: 118
Noble gas signatures constrain oil-field water as the carrier phase of hydrocarbons occurring in shallow aquifers in the San Joaquin Basin, USA Noble gas signatures constrain oil-field water as the carrier phase of hydrocarbons occurring in shallow aquifers in the San Joaquin Basin, USA
Noble gases record fluid interactions in multiphase subsurface environments through fractionation processes during fluid equilibration. Water in the presence of hydrocarbons at the subsurface acquires a distinct elemental signature due to the difference in solubility between these two fluids. We find the atmospheric noble gas signature in produced water is partially preserved after...
Authors
Ruta Karolyte, Peter H. Barry, Andrew G. Hunt, Justin Kulongoski, R. Tyne, Tracy Davis, Michael Wright, Peter McMahon, C. Ballentine
Relative risk of groundwater-quality degradation near California (USA) oil fields estimated from 3H, 14C, and 4He Relative risk of groundwater-quality degradation near California (USA) oil fields estimated from 3H, 14C, and 4He
Relative risks of groundwater-quality degradation near selected California oil fields are estimated by examining spatial and temporal patterns in chemical and isotopic data in the context of groundwater-age categories defined by tritium and carbon-14. In the Coastal basins, western San Joaquin Valley (SJV), and eastern SJV; 82, 76, and 0% of samples are premodern (pre-1953 recharge)...
Authors
Peter McMahon, Matthew Landon, Tracy Davis, Michael Wright, Celia Rosecrans, Robert Anders, Michael Land, Justin Kulongoski, Andrew G. Hunt
Geochemistry and age of groundwater in the Williston Basin, USA: Assessing potential effects of shale-oil production on groundwater quality Geochemistry and age of groundwater in the Williston Basin, USA: Assessing potential effects of shale-oil production on groundwater quality
Thirty water wells were sampled in 2018 to understand the geochemistry and age of groundwater in the Williston Basin and assess potential effects of shale-oil production from the Three Forks-Bakken petroleum system (TBPS) on groundwater quality. Two geochemical groups are identified using hierarchical cluster analysis. Group 1 represents the younger (median 4He = 21.49 × 10−8 cm3 STP/g)...
Authors
Peter McMahon, Joel Galloway, Andrew G. Hunt, Kenneth Belitz, Bryant Jurgens, Tyler D. Johnson
Origin and geochemistry of formation waters from the lower Eagle Ford Group, Gulf Coast Basin, south central Texas Origin and geochemistry of formation waters from the lower Eagle Ford Group, Gulf Coast Basin, south central Texas
The lower Eagle Ford Group (LEFG) is one of the most productive continuous hydrocarbon plays in the United States but few associated produced waters data and minimal interpretation have been published. This effort focuses on results from compositional and isotopic data from 39 produced water samples collected from horizontal wells producing from the LEFG in south central Texas. The depth...
Authors
Mark Engle, Colin Doolan, Janet K. Pitman, Matthew S. Varonka, Jessica Chenault, William Orem, Peter McMahon, Aaron M. Jubb
Fluoride occurrence in United States groundwater Fluoride occurrence in United States groundwater
Data from 38,105 wells were used to characterize fluoride (F) occurrence in untreated United States (U.S.) groundwater. For domestic wells (n = 11,032), water from which is generally not purposely fluoridated or monitored for quality, 10.9% of the samples have F concentrations >0.7 mg/L (U.S. Public Health Service recommended optimal F concentration in drinking water for preventing tooth...
Authors
Peter McMahon, Craig J. Brown, Tyler D. Johnson, Kenneth Belitz, Bruce Lindsey
Multiple-well monitoring site adjacent to the Lost Hills oil field, Kern County, California Multiple-well monitoring site adjacent to the Lost Hills oil field, Kern County, California
The U.S. Geological Survey (USGS), in cooperation with the California State Water Resources Control Board, is evaluating several questions about oil and gas development and groundwater resources in California, including (1) the location of groundwater resources; (2) the proximity of oil and gas operations and groundwater and the geologic materials between them; (3) the location of...
Authors
Rhett Everett, Adam Kjos, Anthony Brown, Janice M. Gillespie, Peter McMahon
Science and Products
Filter Total Items: 14
Methane and benzene in drinking-water wells overlying the Eagle Ford, Fayetteville, and Haynesville Shale hydrocarbon production areas Methane and benzene in drinking-water wells overlying the Eagle Ford, Fayetteville, and Haynesville Shale hydrocarbon production areas
Groundwater samples were collected from domestic and public-supply wells in the Eagle Ford study area in 201516, in the Fayetteville study area in 2015, and in the Haynesville study area in 201415. One sample of produced water was collected from a gas well in the Haynesville Shale in Rusk County, Texas in 2010, and 5 samples of produced water were collected from oil and condensate wells...
Produced water chemistry for samples from four petroleum wells, southern San Joaquin Valley, California, 2014 Produced water chemistry for samples from four petroleum wells, southern San Joaquin Valley, California, 2014
The U.S. Geological Survey (USGS) in cooperation with the California State Water Resources Control Board collected produced water samples from four petroleum wells in the southern San Joaquin Valley on November 5, 2014. This digital dataset contains the site information, analyzing laboratories and methods, and water chemistry and quality control results for these samples. Water chemistry...
Filter Total Items: 118
Noble gas signatures constrain oil-field water as the carrier phase of hydrocarbons occurring in shallow aquifers in the San Joaquin Basin, USA Noble gas signatures constrain oil-field water as the carrier phase of hydrocarbons occurring in shallow aquifers in the San Joaquin Basin, USA
Noble gases record fluid interactions in multiphase subsurface environments through fractionation processes during fluid equilibration. Water in the presence of hydrocarbons at the subsurface acquires a distinct elemental signature due to the difference in solubility between these two fluids. We find the atmospheric noble gas signature in produced water is partially preserved after...
Authors
Ruta Karolyte, Peter H. Barry, Andrew G. Hunt, Justin Kulongoski, R. Tyne, Tracy Davis, Michael Wright, Peter McMahon, C. Ballentine
Relative risk of groundwater-quality degradation near California (USA) oil fields estimated from 3H, 14C, and 4He Relative risk of groundwater-quality degradation near California (USA) oil fields estimated from 3H, 14C, and 4He
Relative risks of groundwater-quality degradation near selected California oil fields are estimated by examining spatial and temporal patterns in chemical and isotopic data in the context of groundwater-age categories defined by tritium and carbon-14. In the Coastal basins, western San Joaquin Valley (SJV), and eastern SJV; 82, 76, and 0% of samples are premodern (pre-1953 recharge)...
Authors
Peter McMahon, Matthew Landon, Tracy Davis, Michael Wright, Celia Rosecrans, Robert Anders, Michael Land, Justin Kulongoski, Andrew G. Hunt
Geochemistry and age of groundwater in the Williston Basin, USA: Assessing potential effects of shale-oil production on groundwater quality Geochemistry and age of groundwater in the Williston Basin, USA: Assessing potential effects of shale-oil production on groundwater quality
Thirty water wells were sampled in 2018 to understand the geochemistry and age of groundwater in the Williston Basin and assess potential effects of shale-oil production from the Three Forks-Bakken petroleum system (TBPS) on groundwater quality. Two geochemical groups are identified using hierarchical cluster analysis. Group 1 represents the younger (median 4He = 21.49 × 10−8 cm3 STP/g)...
Authors
Peter McMahon, Joel Galloway, Andrew G. Hunt, Kenneth Belitz, Bryant Jurgens, Tyler D. Johnson
Origin and geochemistry of formation waters from the lower Eagle Ford Group, Gulf Coast Basin, south central Texas Origin and geochemistry of formation waters from the lower Eagle Ford Group, Gulf Coast Basin, south central Texas
The lower Eagle Ford Group (LEFG) is one of the most productive continuous hydrocarbon plays in the United States but few associated produced waters data and minimal interpretation have been published. This effort focuses on results from compositional and isotopic data from 39 produced water samples collected from horizontal wells producing from the LEFG in south central Texas. The depth...
Authors
Mark Engle, Colin Doolan, Janet K. Pitman, Matthew S. Varonka, Jessica Chenault, William Orem, Peter McMahon, Aaron M. Jubb
Fluoride occurrence in United States groundwater Fluoride occurrence in United States groundwater
Data from 38,105 wells were used to characterize fluoride (F) occurrence in untreated United States (U.S.) groundwater. For domestic wells (n = 11,032), water from which is generally not purposely fluoridated or monitored for quality, 10.9% of the samples have F concentrations >0.7 mg/L (U.S. Public Health Service recommended optimal F concentration in drinking water for preventing tooth...
Authors
Peter McMahon, Craig J. Brown, Tyler D. Johnson, Kenneth Belitz, Bruce Lindsey
Multiple-well monitoring site adjacent to the Lost Hills oil field, Kern County, California Multiple-well monitoring site adjacent to the Lost Hills oil field, Kern County, California
The U.S. Geological Survey (USGS), in cooperation with the California State Water Resources Control Board, is evaluating several questions about oil and gas development and groundwater resources in California, including (1) the location of groundwater resources; (2) the proximity of oil and gas operations and groundwater and the geologic materials between them; (3) the location of...
Authors
Rhett Everett, Adam Kjos, Anthony Brown, Janice M. Gillespie, Peter McMahon