Geoffrey S Ellis (Former Employee)
Science and Products
Mapping Prospectivity for Geologic Hydrogen
The U.S. Geological Survey (USGS) has developed a new methodology to identify regions in the United States with the potential for naturally occurring hydrogen. This innovative approach supports clean energy research and exploration, marking a major step forward in diversifying the nation’s energy portfolio.
Geologic Hydrogen
The USGS Geologic Hydrogen Project conducts research on naturally occurring hydrogen across the nation and the world. The project provides critical scientific insight and data that support the discovery, assessment, and responsible management of geologic hydrogen resources. Research efforts are focused on understanding the natural processes that could lead to recoverable geologic hydrogen...
Data Release for Prospectivity Mapping for Geologic Hydrogen Data Release for Prospectivity Mapping for Geologic Hydrogen
This data release contains multiple data layers and describes the processing steps associated with the U.S. Geological Survey Professional Paper 1900 "Prospectivity Mapping for Geologic Hydrogen". The data comprise the geologic and geophysical inputs used in support of the U.S. Geological Survey's efforts to create the first map of geologic hydrogen prospectivity within the U.S. The maps...
Geochemical and spectroscopic data on core samples from Lake Tanganyika in Tanzania Geochemical and spectroscopic data on core samples from Lake Tanganyika in Tanzania
This data release contains geochemical and spectroscopic laboratory results associated with the journal article "Middle-Late Holocene paleolimnological changes in central Lake Tanganyika: Integrated evidence from the Kavala Island Ridge (Tanzania)". Data include bulk organic geochemistry, organic stable carbon isotope, and infrared spectroscopic analyses. Location for LT-TANG17-9B-1U-1...
Sedimentary geochemistry of a deepwater slope environment of southern Lake Tanganyika Sedimentary geochemistry of a deepwater slope environment of southern Lake Tanganyika
This dataset contains geochemical data (Total Inorganic Carbon, Total Organic Carbon, Total Nitrogen, δ13C of Organic Carbon, Hydrogen Index, Oxygen Index, Zirconium/Aluminum, and Magnetic Susceptibility) for sediments from one short (~1 m) core collected in 420 m of water in southern Lake Tanganyika, Tanzania.
Stable Isotopic Data (Delta13C and Delta2H) for Reference Materials HCG-1, HCG-2, and HCG-3 Stable Isotopic Data (Delta13C and Delta2H) for Reference Materials HCG-1, HCG-2, and HCG-3
Stable carbon and hydrogen isotopic data generated by off-line preparation and dual inlet mass spectrometric analysis used the determine the recommended values for the reference materials HCG-1, HCG-2, and HCG-3.
Filter Total Items: 81
Understanding the resource potential of natural hydrogen on Earth: Scientific gaps, uncertainties and recommendations Understanding the resource potential of natural hydrogen on Earth: Scientific gaps, uncertainties and recommendations
A comprehensive scientific research roadmap is essential to bridge knowledge gaps and deepen the understanding of key geological, geochemical, and geophysical aspects of natural hydrogen (H2) as a potential new energy resource. This paper reviews major scientific uncertainties on natural H2, suggesting research priorities, as a guide for defining exploration strategies, techniques, and...
Authors
Giuseppe Etiope, Geoffrey S. Ellis, Omid H. Ardakani, Christopher J. Boreham, Peter Klitzke, Antonio Martín-Monge, Humberto L.S. Reis, Alexis S. Templeton, Hyeong Soo Kim, Eric Gaucher, Olivier Sissmann
Assessment of undiscovered conventional oil and gas resources of the West Greenland-East Canada Province, 2023 Assessment of undiscovered conventional oil and gas resources of the West Greenland-East Canada Province, 2023
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean conventional resources of 7.8 billion barrels of oil and 91.9 trillion cubic feet of gas in the West Greenland-East Canada Province.
Authors
Christopher J. Schenk, Tracey J. Mercier, Cheryl A. Woodall, Phuong A. Le, Andrea D. Cicero, Ronald M. Drake, Geoffrey S. Ellis, Michael H. Gardner, Sarah E. Gelman, Jane S. Hearon, Benjamin G. Johnson, Jenny H. Lagesse, Heidi M. Leathers-Miller, Kristen R. Marra, Kira K. Timm, Scott S. Young
Assessment of continuous oil and gas resources in the Upper Cretaceous Niobrara Formation in the Southwestern Wyoming Province, Wyoming and Colorado, 2024 Assessment of continuous oil and gas resources in the Upper Cretaceous Niobrara Formation in the Southwestern Wyoming Province, Wyoming and Colorado, 2024
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean continuous resources of 703 million barrels of oil and 5.8 trillion cubic feet of gas in the Niobrara Formation in the Southwestern Wyoming Province, Wyoming and Colorado.
Authors
Kira K. Timm, Christopher J. Schenk, Jane S. Hearon, Thomas M. Finn, Sarah E. Gelman, Cheryl A. Woodall, Tracey J. Mercier, Andrea D. Cicero, Ronald M. Drake, Geoffrey S. Ellis, Michael H. Gardner, Benjamin G. Johnson, Jenny H. Lagesse, Phuong A. Le, Heidi M. Leathers-Miller, Scott S. Young
Geologic hydrogen potential in the Rocky Mountain region Geologic hydrogen potential in the Rocky Mountain region
No abstract available.
Authors
Jane S. Hearon, Sarah E. Gelman, Geoffrey S. Ellis
Prospectivity mapping for geologic hydrogen Prospectivity mapping for geologic hydrogen
Geologic, or naturally occurring, hydrogen has the potential to become a new, low-carbon, primary energy resource. Often referred to as “white” or “gold” hydrogen, this gas occurs naturally in the Earth’s subsurface, similar to petroleum resources. However, unlike petroleum, which releases carbon dioxide when burned, burning hydrogen only produces water as a byproduct. Exploration for...
Authors
Sarah E. Gelman, Jane S. Hearon, Geoffrey S. Ellis
Model predictions of global geologic hydrogen resources Model predictions of global geologic hydrogen resources
Geologic hydrogen could be a low-carbon primary energy resource; however, the magnitude of Earth’s subsurface endowment has not yet been assessed. Knowledge of the occurrence and behavior of natural hydrogen on Earth has been combined with information from geologic analogs to construct a mass balance model to predict the resource potential. Given the associated uncertainty, stochastic...
Authors
Geoffrey S. Ellis, Sarah E. Gelman
Recognition of artificial gases formed during drill-bit metamorphism using advanced mud gas Recognition of artificial gases formed during drill-bit metamorphism using advanced mud gas
Drill-bit metamorphism (DBM) is the process of thermal degradation of drilling fluid at the interface of the bit and rock due to the overheating of the bit. The heat generated by the drill when drilling into a rock formation promotes the generation of artificial hydrocarbon and non-hydrocarbon gas, changing the composition of the gas. The objective of this work is to recognize and...
Authors
Janaina A. de Lima Leon, Henrique Luiz de Barros Penteado, Geoffrey S. Ellis, Alexei V. Milkov, João Graciano Mendonça Filho
Assessment of conventional and continuous oil and gas resources in the Lewis Shale in the Southwestern Wyoming Province, Wyoming and Colorado, 2023 Assessment of conventional and continuous oil and gas resources in the Lewis Shale in the Southwestern Wyoming Province, Wyoming and Colorado, 2023
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean conventional and continuous resources of 294 million barrels of oil and 11 trillion cubic feet of gas in the Lewis Shale in the Southwestern Wyoming Province, Wyoming and Colorado.
Authors
Jane S. Hearon, Christopher J. Schenk, Thomas M. Finn, Benjamin G. Johnson, Sarah E. Gelman, Jenny H. Lagesse, Cheryl A. Woodall, Tracey J. Mercier, Heidi M. Leathers-Miller, Kira K. Timm, Ronald M. Drake, Andrea D. Cicero, Geoffrey S. Ellis, Michael H. Gardner, Phuong A. Le, Scott S. Young
Assessment of undiscovered conventional oil and gas resources of offshore East Africa and the Seychelles, 2022 Assessment of undiscovered conventional oil and gas resources of offshore East Africa and the Seychelles, 2022
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 5.1 billion barrels of oil and 79.1 trillion cubic feet of gas in offshore East Africa and the Seychelles.
Authors
Christopher J. Schenk, Tracey J. Mercier, Cheryl A. Woodall, Phuong A. Le, Andrea D. Cicero, Ronald M. Drake, Geoffrey S. Ellis, Thomas M. Finn, Michael H. Gardner, Sarah E. Gelman, Jane S. Hearon, Benjamin G. Johnson, Jenny H. Lagesse, Heidi M. Leathers-Miller, Kristen R. Marra, Kira K. Timm, Scott S. Young
Assessment of undiscovered conventional oil and gas resources of the Black Sea area, 2023 Assessment of undiscovered conventional oil and gas resources of the Black Sea area, 2023
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 2.3 billion barrels of oil and 105.5 trillion cubic feet of gas in the Black Sea area.
Authors
Christopher J. Schenk, Tracey J. Mercier, Cheryl A. Woodall, Phuong A. Le, Andrea D. Cicero, Ronald M. Drake, Geoffrey S. Ellis, Thomas M. Finn, Michael H. Gardner, Sarah E. Gelman, Jane S. Hearon, Benjamin G. Johnson, Jenny H. Lagesse, Heidi M. Leathers-Miller, Kristen R. Marra, Kira K. Timm, Scott S. Young
Hydrogen systems and reactive transport modelling: An approach to natural hydrogen exploration Hydrogen systems and reactive transport modelling: An approach to natural hydrogen exploration
No abstract available.
Authors
Geoffrey S. Ellis, Daniel Palmowski, Nicolas Lefeuvre
Middle-late Holocene paleolimnological changes in central Lake Tanganyika: Integrated evidence from the Kavala Island Ridge (Tanzania) Middle-late Holocene paleolimnological changes in central Lake Tanganyika: Integrated evidence from the Kavala Island Ridge (Tanzania)
Middle and Late Holocene sediments have not been extensively sampled in Lake Tanganyika, and much remains unknown about the response of the Rift Valley’s largest lake to major environmental shifts during the Holocene, including the termination of the African Humid Period (AHP). Here, we present an integrated study (sedimentology, mineralogy, and geochemistry) of a radiocarbon-dated...
Authors
Leandro Domingos-Luz, Michael J. Soreghan, Giliane G. Rasbold, Geoffrey S. Ellis, Justin E. Birdwell, Ishmael A. Kimirei, Christopher A. Scholz, Michael M. McGlue
Science and Products
Mapping Prospectivity for Geologic Hydrogen
The U.S. Geological Survey (USGS) has developed a new methodology to identify regions in the United States with the potential for naturally occurring hydrogen. This innovative approach supports clean energy research and exploration, marking a major step forward in diversifying the nation’s energy portfolio.
Geologic Hydrogen
The USGS Geologic Hydrogen Project conducts research on naturally occurring hydrogen across the nation and the world. The project provides critical scientific insight and data that support the discovery, assessment, and responsible management of geologic hydrogen resources. Research efforts are focused on understanding the natural processes that could lead to recoverable geologic hydrogen...
Data Release for Prospectivity Mapping for Geologic Hydrogen Data Release for Prospectivity Mapping for Geologic Hydrogen
This data release contains multiple data layers and describes the processing steps associated with the U.S. Geological Survey Professional Paper 1900 "Prospectivity Mapping for Geologic Hydrogen". The data comprise the geologic and geophysical inputs used in support of the U.S. Geological Survey's efforts to create the first map of geologic hydrogen prospectivity within the U.S. The maps...
Geochemical and spectroscopic data on core samples from Lake Tanganyika in Tanzania Geochemical and spectroscopic data on core samples from Lake Tanganyika in Tanzania
This data release contains geochemical and spectroscopic laboratory results associated with the journal article "Middle-Late Holocene paleolimnological changes in central Lake Tanganyika: Integrated evidence from the Kavala Island Ridge (Tanzania)". Data include bulk organic geochemistry, organic stable carbon isotope, and infrared spectroscopic analyses. Location for LT-TANG17-9B-1U-1...
Sedimentary geochemistry of a deepwater slope environment of southern Lake Tanganyika Sedimentary geochemistry of a deepwater slope environment of southern Lake Tanganyika
This dataset contains geochemical data (Total Inorganic Carbon, Total Organic Carbon, Total Nitrogen, δ13C of Organic Carbon, Hydrogen Index, Oxygen Index, Zirconium/Aluminum, and Magnetic Susceptibility) for sediments from one short (~1 m) core collected in 420 m of water in southern Lake Tanganyika, Tanzania.
Stable Isotopic Data (Delta13C and Delta2H) for Reference Materials HCG-1, HCG-2, and HCG-3 Stable Isotopic Data (Delta13C and Delta2H) for Reference Materials HCG-1, HCG-2, and HCG-3
Stable carbon and hydrogen isotopic data generated by off-line preparation and dual inlet mass spectrometric analysis used the determine the recommended values for the reference materials HCG-1, HCG-2, and HCG-3.
Filter Total Items: 81
Understanding the resource potential of natural hydrogen on Earth: Scientific gaps, uncertainties and recommendations Understanding the resource potential of natural hydrogen on Earth: Scientific gaps, uncertainties and recommendations
A comprehensive scientific research roadmap is essential to bridge knowledge gaps and deepen the understanding of key geological, geochemical, and geophysical aspects of natural hydrogen (H2) as a potential new energy resource. This paper reviews major scientific uncertainties on natural H2, suggesting research priorities, as a guide for defining exploration strategies, techniques, and...
Authors
Giuseppe Etiope, Geoffrey S. Ellis, Omid H. Ardakani, Christopher J. Boreham, Peter Klitzke, Antonio Martín-Monge, Humberto L.S. Reis, Alexis S. Templeton, Hyeong Soo Kim, Eric Gaucher, Olivier Sissmann
Assessment of undiscovered conventional oil and gas resources of the West Greenland-East Canada Province, 2023 Assessment of undiscovered conventional oil and gas resources of the West Greenland-East Canada Province, 2023
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean conventional resources of 7.8 billion barrels of oil and 91.9 trillion cubic feet of gas in the West Greenland-East Canada Province.
Authors
Christopher J. Schenk, Tracey J. Mercier, Cheryl A. Woodall, Phuong A. Le, Andrea D. Cicero, Ronald M. Drake, Geoffrey S. Ellis, Michael H. Gardner, Sarah E. Gelman, Jane S. Hearon, Benjamin G. Johnson, Jenny H. Lagesse, Heidi M. Leathers-Miller, Kristen R. Marra, Kira K. Timm, Scott S. Young
Assessment of continuous oil and gas resources in the Upper Cretaceous Niobrara Formation in the Southwestern Wyoming Province, Wyoming and Colorado, 2024 Assessment of continuous oil and gas resources in the Upper Cretaceous Niobrara Formation in the Southwestern Wyoming Province, Wyoming and Colorado, 2024
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean continuous resources of 703 million barrels of oil and 5.8 trillion cubic feet of gas in the Niobrara Formation in the Southwestern Wyoming Province, Wyoming and Colorado.
Authors
Kira K. Timm, Christopher J. Schenk, Jane S. Hearon, Thomas M. Finn, Sarah E. Gelman, Cheryl A. Woodall, Tracey J. Mercier, Andrea D. Cicero, Ronald M. Drake, Geoffrey S. Ellis, Michael H. Gardner, Benjamin G. Johnson, Jenny H. Lagesse, Phuong A. Le, Heidi M. Leathers-Miller, Scott S. Young
Geologic hydrogen potential in the Rocky Mountain region Geologic hydrogen potential in the Rocky Mountain region
No abstract available.
Authors
Jane S. Hearon, Sarah E. Gelman, Geoffrey S. Ellis
Prospectivity mapping for geologic hydrogen Prospectivity mapping for geologic hydrogen
Geologic, or naturally occurring, hydrogen has the potential to become a new, low-carbon, primary energy resource. Often referred to as “white” or “gold” hydrogen, this gas occurs naturally in the Earth’s subsurface, similar to petroleum resources. However, unlike petroleum, which releases carbon dioxide when burned, burning hydrogen only produces water as a byproduct. Exploration for...
Authors
Sarah E. Gelman, Jane S. Hearon, Geoffrey S. Ellis
Model predictions of global geologic hydrogen resources Model predictions of global geologic hydrogen resources
Geologic hydrogen could be a low-carbon primary energy resource; however, the magnitude of Earth’s subsurface endowment has not yet been assessed. Knowledge of the occurrence and behavior of natural hydrogen on Earth has been combined with information from geologic analogs to construct a mass balance model to predict the resource potential. Given the associated uncertainty, stochastic...
Authors
Geoffrey S. Ellis, Sarah E. Gelman
Recognition of artificial gases formed during drill-bit metamorphism using advanced mud gas Recognition of artificial gases formed during drill-bit metamorphism using advanced mud gas
Drill-bit metamorphism (DBM) is the process of thermal degradation of drilling fluid at the interface of the bit and rock due to the overheating of the bit. The heat generated by the drill when drilling into a rock formation promotes the generation of artificial hydrocarbon and non-hydrocarbon gas, changing the composition of the gas. The objective of this work is to recognize and...
Authors
Janaina A. de Lima Leon, Henrique Luiz de Barros Penteado, Geoffrey S. Ellis, Alexei V. Milkov, João Graciano Mendonça Filho
Assessment of conventional and continuous oil and gas resources in the Lewis Shale in the Southwestern Wyoming Province, Wyoming and Colorado, 2023 Assessment of conventional and continuous oil and gas resources in the Lewis Shale in the Southwestern Wyoming Province, Wyoming and Colorado, 2023
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean conventional and continuous resources of 294 million barrels of oil and 11 trillion cubic feet of gas in the Lewis Shale in the Southwestern Wyoming Province, Wyoming and Colorado.
Authors
Jane S. Hearon, Christopher J. Schenk, Thomas M. Finn, Benjamin G. Johnson, Sarah E. Gelman, Jenny H. Lagesse, Cheryl A. Woodall, Tracey J. Mercier, Heidi M. Leathers-Miller, Kira K. Timm, Ronald M. Drake, Andrea D. Cicero, Geoffrey S. Ellis, Michael H. Gardner, Phuong A. Le, Scott S. Young
Assessment of undiscovered conventional oil and gas resources of offshore East Africa and the Seychelles, 2022 Assessment of undiscovered conventional oil and gas resources of offshore East Africa and the Seychelles, 2022
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 5.1 billion barrels of oil and 79.1 trillion cubic feet of gas in offshore East Africa and the Seychelles.
Authors
Christopher J. Schenk, Tracey J. Mercier, Cheryl A. Woodall, Phuong A. Le, Andrea D. Cicero, Ronald M. Drake, Geoffrey S. Ellis, Thomas M. Finn, Michael H. Gardner, Sarah E. Gelman, Jane S. Hearon, Benjamin G. Johnson, Jenny H. Lagesse, Heidi M. Leathers-Miller, Kristen R. Marra, Kira K. Timm, Scott S. Young
Assessment of undiscovered conventional oil and gas resources of the Black Sea area, 2023 Assessment of undiscovered conventional oil and gas resources of the Black Sea area, 2023
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 2.3 billion barrels of oil and 105.5 trillion cubic feet of gas in the Black Sea area.
Authors
Christopher J. Schenk, Tracey J. Mercier, Cheryl A. Woodall, Phuong A. Le, Andrea D. Cicero, Ronald M. Drake, Geoffrey S. Ellis, Thomas M. Finn, Michael H. Gardner, Sarah E. Gelman, Jane S. Hearon, Benjamin G. Johnson, Jenny H. Lagesse, Heidi M. Leathers-Miller, Kristen R. Marra, Kira K. Timm, Scott S. Young
Hydrogen systems and reactive transport modelling: An approach to natural hydrogen exploration Hydrogen systems and reactive transport modelling: An approach to natural hydrogen exploration
No abstract available.
Authors
Geoffrey S. Ellis, Daniel Palmowski, Nicolas Lefeuvre
Middle-late Holocene paleolimnological changes in central Lake Tanganyika: Integrated evidence from the Kavala Island Ridge (Tanzania) Middle-late Holocene paleolimnological changes in central Lake Tanganyika: Integrated evidence from the Kavala Island Ridge (Tanzania)
Middle and Late Holocene sediments have not been extensively sampled in Lake Tanganyika, and much remains unknown about the response of the Rift Valley’s largest lake to major environmental shifts during the Holocene, including the termination of the African Humid Period (AHP). Here, we present an integrated study (sedimentology, mineralogy, and geochemistry) of a radiocarbon-dated...
Authors
Leandro Domingos-Luz, Michael J. Soreghan, Giliane G. Rasbold, Geoffrey S. Ellis, Justin E. Birdwell, Ishmael A. Kimirei, Christopher A. Scholz, Michael M. McGlue
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government