U.S. Geological Survey Gas Hydrates Project
MATRIX Research Cruise
USGS Coastal/Marine Hazards and Resources Program completed the acquisition of over 2000 km of multichannel seismic (MCS) data as part of the Mid-Atlantic Resource Imaging Experiment (MATRIX) conducted aboard the R/V Hugh R. Sharp.
Learn moreIMMerSS Research Cruise
USGS Gas Hydrates Project led an expedition aboard the R/V Hugh R. Sharp to explore seafloor methane seeps on the northern U.S. Atlantic margin between Baltimore Canyon and Cape Hatteras.
Learn moreResearch Themes
The USGS Gas Hydrates Project focuses on the study of natural gas hydrates in deepwater marine systems and permafrost areas.
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The USGS Gas Hydrates Project focuses on the study of natural gas hydrates in deepwater marine systems and permafrost areas. The primary goals are:
- Evaluate methane hydrates as a potential energy source
- Investigate the interaction between methane hydrate destabilization and climate change at short and long time scales, particularly in the Arctic
- Study the spatial and temporal connections between submarine slope failures and gas hydrate dynamics
The Gas Hydrate Project conducts multidisciplinary field studies, participates in national and international deep drilling expeditions, and maintains a laboratory program focused on hydrate-bearing sediments.
The USGS Gas Hydrates Project focuses on gas hydrates in the natural environment and seeks to advance understanding of (a) the potential of gas hydrates as an energy resource; (b) the role of gas hydrates in climate change, as well as their susceptibility to climate change; and (c) gas hydrates and the stability of submarine slopes. The Gas Hydrates Project maintains an extensive laboratory program to support research in these core areas.
The USGS Gas Hydrates Project has been making contributions to advance understanding of US and international gas hydrates science for over two decades. The research group working on gas hydrates at the USGS is among the largest in the US and has expertise in all the major geoscience disciplines, as well as in the physics and chemistry of gas hydrates, the geotechnical properties of hydrate-bearing sediments, and the biogeochemistry of marine and permafrost gas hydrate systems. The group includes field-based scientists, numerical modelers, laboratory scientists, and supporting technical personnel for marine, permafrost, and laboratory operations. Much of the research is carried out in collaboration with other federal agencies or academic partners, and there are frequently opportunities to collaborate on international programs that jointly serve the Project's mission and the goals of the international partners.
The USGS Gas Hydrates Project integrates across USGS mission areas, programs, and regions. The stars indicate the locations of personnel involved in the Gas Hydrates Project. Within the US, much of the research focuses on the Gulf of Mexico and Alaska, which represent marine and permafrost-associated settings for gas hydrates, respectively.
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Date published: September 18, 2018Status: ActiveThe Mid-Atlantic Resource Imaging Experiment (MATRIX)
In late August 2018, scientists and technical staff from the USGS Coastal/Marine Hazards and Resources Program completed the acquisition of over 2000 km of multichannel seismic (MCS) data as part of the Mid-Atlantic Resource Imaging Experiment (MATRIX) conducted aboard the...
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Date published: August 27, 2018Status: CompletedIMMeRSS-- Interagency Mission for Methane Research on Seafloor Seeps
From May 3 to May 11, 2017, the U.S. Geological Survey, in collaboration with the British Geological Survey and with support from these two agencies, the National Oceanic and Atmospheric Administration (NOAA) Office of Ocean Exploration and Research, and the U.S. Department of Energy, will lead an...
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Date published: August 23, 2018Status: ActiveGas Hydrates- Laboratory and Field Support
The Instrumented Pressure Testing Chamber (IPTC)
A device for measuring the physical properties of naturally-occurring, hydrate-bearing sediment at nearly in situ pressure conditions.
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Date published: August 23, 2018Status: ActiveGas Hydrates- Submarine Slope Destabilization
USGS scientists have a long tradition of studying submarine slope failures and were among the first to note a spatial link between slope failures and gas hydrates/gas-charged sediments. USGS Gas Hydrates scientists support the USGS Hazards Mission area through field-based surveys that refine understanding of this association and through geotechnical studies that evaluate the response of...
Contacts: Carolyn Ruppel, PhD -
Date published: August 23, 2018Status: ActiveGas Hydrates- Atlantic Margin Methane Seeps
Analysis of 94,000 square kilometers of multibeam water column backscatter data collected by the NOAA Okeanos Explorer mostly seaward of the shelf-break on the northern US Atlantic margin reveals more than 570 gas plumes that correspond to seafloor methane seeps. This discovery is documented in an August 2014 ...
Contacts: Carolyn Ruppel, PhD -
Date published: May 2, 2018Status: ActiveEnvironmental Compliance
The National Environmental Policy Act of 1969 (NEPA) is the cornerstone of our Nation's environmental laws and was enacted to ensure that information on the environmental impacts of any Federal, or federally funded, action is available to public officials and citizens before decisions are made and before actions are taken
Contacts: Carolyn Ruppel, PhD -
Date published: March 22, 2018Status: ActiveGas Hydrates- Climate and Hydrate Interactions
Breakdown of gas hydrates due to short- or long-term climate change may release methane to the ocean-atmosphere system. Methane that reaches the atmosphere can in turn exacerbate climate warming. Studies of methane hydrate dynamics and methane release on the continental shelf and upper slope in the US Arctic and Atlantic margin are tracking these processes.
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Date published: March 22, 2018Status: ActiveGas Hydrates-Energy
Natural gas production from methane hydrates may someday prove viable. The USGS Gas Hydrate Project takes part in US and international programs to investigate the potential of deepwater marine and permafrost gas hydrates as an energy resource. Long-term production tests are the next step in this research.
Contacts: Carolyn Ruppel, PhD, Timothy S Collett -
Date published: March 19, 2018Gas Hydrates - Primer
What is Gas Hydrate?
Gas hydrate is an ice-like crystalline form of water and low molecular weight gas (e.g., methane, ethane, carbon dioxide). On Earth, gas hydrates occur naturally in some marine sediments and within and beneath permafrost. Gas hydrates have also been inferred on other planets or their moons.
At the molecular level, gas hydrate...
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Year Published: 2018The U.S. Geological Survey’s Gas Hydrates Project
The Gas Hydrates Project at the U.S. Geological Survey (USGS) focuses on the study of methane hydrates in natural environments. The project is a collaboration between the USGS Energy Resources and the USGS Coastal and Marine Geology Programs and works closely with other U.S. Federal agencies, some State governments, outside research organizations...
Ruppel, Carolyn D.View CitationRuppel, C.D., 2018, The U.S. Geological Survey’s Gas Hydrates Project: U.S. Geological Survey Fact Sheet 2017–3079, 4 p., https://doi.org/10.3133/fs20173079.
Gas hydrates in sustainable chemistry
Gas hydrates have received considerable attention due to their important role in flow assurance for the oil and gas industry, their extensive natural occurrence on Earth and extraterrestrial planets, and their significant applications in sustainable technologies including but not limited to gas and energy storage, gas separation, and water...
Hassanpouryouzband, Aliakbar; Joonaki, Edris; Vasheghani Farahania, Mehrdad; Takeya, Satoshi; Ruppel, Carolyn D.; Yang, Jinhai; English, Neill; Schicks, Judith; Edlmann, Katriona; Mehrabian, Hadi; Tohidi, Bahman Surface methane concentrations along the mid-Atlantic bight driven by aerobic subsurface production rather than seafloor gas seeps
Relatively minor amounts of methane, a potent greenhouse gas, are currently emitted from the oceans to the atmosphere, but such methane emissions have been hypothesized to increase as oceans warm. Here, we investigate the source, distribution, and fate of methane released from the upper continental slope of the U.S. Mid-Atlantic Bight, where...
Leonte, Mihai; Ruppel, Carolyn D.; Ruiz-Angelo, Angel; Kessler, John D. Potential freshening impacts on fines migration and pore-throat clogging during gas hydrate production: 2-D micromodel study with Diatomaceous UBGH2 sediments
The methane gas hydrate stored in natural sediments is considered a potential gas resource. Countries such as China, India, Japan, and Korea are interested in commercializing this resource, and offshore field pilot tests for gas production have been conducted using depressurization methods to destabilize gas hydrate and facilitate the migration...
Jang, Junbong; Cao, Shaung; Stern, Laura A.; Waite, William F.; Jung, Jongwon; Lee, Joo Yong Gas hydrate petroleum systems: What constitutes the “seal”?
The gas hydrate petroleum system (GHPS) approach, which has been used to characterize gas hydrates in nature, utilizes three distinct components: a methane source, a methane migration pathway, and a reservoir that not only contains gas hydrate, but also acts as a seal to prevent methane loss. Unlike GHPS, a traditional petroleum system (PS)...
Jang, Junbong; Waite, William F.; Stern, Laura A. Permeability anisotropy and relative permeability in sediments from the National Gas Hydrate Program Expedition 02, offshore India
Gas and water permeability through hydrate-bearing sediments essentially governs the economic feasibility of gas production from gas hydrate deposits. Characterizing a reservoir’s permeability can be difficult because even collocated permeability measurements can vary by 4-5 orders of magnitude, due partly to differences between how various...
Dai, Sheng; Kim, J.; Xu, Yue; Waite, William F.; Jang, Junbong; Yoneda, J.; Collett, Timothy S.; Kumar, Pushpendra Pressure core based onshore laboratory analysis on mechanical properties of hydrate-bearing sediments recovered during India's National Gas Hydrate Program Expedition (NGHP) 02
A solid understanding of the mechanical properties of hydrate-bearing sediments is essential for the safe and economic development of methane hydrate as an energy resource. In 2015, 104 pressure cores were collected, recovering sediments from above and within concentrated hydrate reservoirs in the Krishna-Godavari Basin, as part of India’s...
Yoneda, J.; Oshima, Motoi; Kida, Masato; Kato, Akira; Konno, Yoshihiro; Jin, Yusuke; Jang, Junbong; Waite, William F.; Kumar, Pushpendra; Tenma, Norio Physical property characteristics of gas hydrate-bearing reservoir and associated seal sediments collected during NGHP-02 in the Krishna-Godavari Basin, in the offshore of India
India’s National Gas Hydrate Program Expedition 02 (NGHP-02), was conducted to better understand geologic controls on gas hydrate occurrence and morphology, targeting potentially coarse-grained sediments near the base of the continental slope offshore eastern India. This study combines seismic, logging-while-drilling data, and a petroleum systems...
Jang, Junbong; Waite, William F.; Stern, Laura A.; Collett, Timothy S.; Kumar, Pushpendra Compressibility and particle crushing of Krishna-Godavari Basin sediments from offshore India: Implications for gas production from deep-water gas hydrate deposits
Depressurizing a gas hydrate reservoir to extract methane induces high effective stresses that act to compress the reservoir. Predicting whether a gas hydrate reservoir is viable as an energy resource requires enhanced understanding of the reservoir’s compressibility and susceptibility to particle crushing in response to elevated effective stress...
Kim, J.; Dai, Sheng; Jang, Junbong; Waite, William F.; Collett, Timothy S.; Kumar, Pushpendra Preface: Marine gas hydrate reservoir systems along the eastern continental margin of India: Results of the National Gas Hydrate Program Expedition 02
The 2015 India National Gas Hydrate Program (NGHP) Expedition 02 was conducted to obtain new information on the occurrence of gas hydrate systems and to advance the understanding of geologic controls on the formation of gas hydrate accumulations in the offshore of India. The ultimate goal of the NGHP effort is to assess the energy resource...
Collett, Timothy S.; Pushpendra Kumar; Ray Boswell; Waite, William India National Gas Hydrate Program Expedition-02: Operational and technical summary
The India National Gas Hydrate Program is being steered by the government of India's Ministry of Petroleum and Natural Gas (MoPNG) with participation of Directorate General of Hydrocarbons (DGH), Oil and Natural Gas Corporation Limited (ONGC), and the National Oil Companies and Research Institutes of India. The India National Gas Hydrate Program...
Pushpendra Kumar; Collett, Timothy S.; K. M. Shukla; U. S. Yadav; M. V. Lall; Krishna Vishwanath India National Gas Hydrate Program Expedition 02 Summary of Scientific Results: Gas hydrate systems along the eastern continental margin of India
The primary objectives of the India National Gas Hydrate Program Expedition 02 (NGHP-02) were to obtain new data on the occurrence of gas hydrate systems and to advance the understanding of the controls on the formation of gas hydrate accumulations in the offshore of India. In accordance with the ultimate overall goal of the NGHP effort to assess...
Collett, Timothy S.; Ray Boswell; Waite, William F.; Pushpendra Kumar; Sandip Kumar Roy; Krishan Chopra; Sunil Kumar Singh; Yasuhiro Yamada; Tenma, Norio; Pohlman, John; Zyrianova, Margarita National Gas Hydrate Program expedition 02: Identification of gas hydrate prospects in the Krishna-Godavari Basin, offshore India
After completing the first expedition of India's National Gas Hydrate Program (NGHP-01) in 2006, it was concluded that for the next expedition (National Gas Hydrate Program 02; NGHP-02), a new drill site review effort should focus on identifying potential deep-water offshore gas hydrate accumulations in sand dominated depositional environments....
K.M. Shukla; U.S. Yadav; Pushpendra Kumar; Collett, Timothy; Boswell, R.; Frye, M.; M. Riedel; I. Kaurf; K. Vishwanathf-
Date published: June 12, 2020Preliminary global database of known and inferred gas hydrate locations
This data release provides a text description of the region, geographic coordinates, and the citation for the published reference for known and inferred gas hydrate locations. Where the existence of gas hydrate was inferred, the description of the criteria used to make the inference was also included.
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Date published: April 9, 2020Marine Geophysical Data Collected to Support Methane Seep Research Along the U.S. Atlantic Continental Shelf Break and Upper Continental Slope Between the Baltimore and Keller Canyons During U.S. Geological Survey Field Activities 2017-001-FA and 2017-002
In spring and summer 2017, the U.S. Geological Survey’s Gas Hydrates Project conducted two cruises aboard the research vessel Hugh R. Sharp to explore the geology, chemistry, ecology, physics, and oceanography of sea-floor methane seeps and water column gas plumes on the northern U.S. Atlantic margin between the Baltimore and Keller Canyons.
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Date published: July 12, 2019Post-expedition report for USGS T-3 ice island heat flow measurements in the High Arctic Ocean, 1963-1973
In February 1963, the U.S. Geological Survey (USGS) began a study of heat flow in the Arctic Ocean Basin and acquired data at 356 sites in Canada Basin and Nautilus Basin and on Alpha-Mendeleev Ridge by the end of the project in 1973. The USGS heat flow and associated piston coring operations were conducted from a scientific station on the freely drifting T-3 Ice island.
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Date published: July 12, 2019Thermal Data and Navigation for T-3 (Fletcher's) Ice Island Arctic Ocean Heat Flow Studies, 1963-73
The T-3 (Fletcher's) Ice Island in the Arctic Ocean was the site of a scientific research station re-established by the Naval Arctic Research Laboratory starting in 1962. This dataset is the enhanced version of the original data table from Lachenbruch and others incorporating additional information such as the probable dates of measurement, physiographic province.
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Date published: February 28, 2019Pressure Core Characterization Tool Measurements of Compressibility, Permeability, and Shear Strength of Fine-Grained Sediment Collected from Area C, Krishna-Godavari Basin, during India's National Gas Hydrate Program Expedition NGHP-02
This data release provides results for flow-through permeability, consolidation, and direct shear measurements made on fine-grained seal sediment from Site NGHP-02-08 offshore eastern India. The sediment was collected in a pressure core from the Krishna-Godavari Basin during the 2015 Indian National Gas Hydrate Program Expedition 2 (NGHP-02).
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Date published: February 28, 2019Dependence of Sedimentation Behavior on Pore-Fluid Chemistry for Sediment Collected From Area B, Krishna-Godavari Basin During India's National Gas Hydrate Program, NGHP-02
The results included in this data release can provide insight into the types of fines present, which can be difficult to quantify if using the more standard x-ray diffraction method for identifying fines and indicate whether the in situ fines are likely to increase or decrease their capacity to clog pore throats as the pore water transitions from higher to lower salinity.
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Date published: February 28, 20192D micromodel studies of pore-throat clogging by pure fine-grained sediments and natural sediments from NGHP-02, offshore India
Fine-grained sediments, or “fines,” are nearly ubiquitous in natural sediments, even in the predominantly coarse-grained sediments that host gas hydrates. Fines within these sandy sediments can be mobilized and subsequently clog flow pathways while methane is being extracted from gas hydrate as an energy resource.
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Date published: February 28, 2019Physical Properties of Sediment Collected during India's National Gas Hydrate Program NGHP-02 Expedition in the Krishna-Godavari Basin Offshore Eastern India, 2015
This data release contains measurement results for physical properties measured on recovered core material, including measurements on gas-hydrate-bearing sediment preserved in pressure cores, and physical properties of gas hydrate-free sediment recovered from conventional cores.
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Date published: July 24, 2018Effect of pore fluid chemistry on the sedimentation and compression behavior of pure, endmember fines
The data in this release support the correlation effort by providing: 1) sedimentation results that provide insight into micro-scale sediment fabric and void ratio dependence on sediment/fluid interactions, and 2) consolidation results that quantify the macro-scale compressibility and recompressibility parameters for a suite of fine-grained sediments and differing pore fluids.
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Date published: July 24, 2018
Effect of pore fluid chemistry on the sedimentation and compression behavior of pure, endmember fines
The data in this release support the correlation effort by providing: 1) sedimentation results that provide insight into micro-scale sediment fabric and void ratio dependence on sediment/fluid interactions, and 2) consolidation results that quantify the macro-scale compressibility and recompressibility parameters for a suite of fine-grained sediments and differing pore fluids.
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Date published: February 15, 2018Data and calculations to support the study of the sea-air flux of methane and carbon dioxide on the West Spitsbergen margin in June 2014
This dataset collected on the West Spitsbergen margin during U.S. Geological Survey Coastal and Marine Geology Program Field Activity 2014-013-FA, which was carried out in conjunction with the University of Tromso and the GEOMAR Helmholtz Centre for Ocean Research Kiel on the R/V Helmer Hanssen.
Matrix cruise study area
Multichannel seismic lines acquired during the 2018 MATRIX program are shown in yellow, with the locations of sonobuoy deployments indicated by orange crosses. Dotted black line is the track of the R/V Hugh R. Sharp when seismic data were not being acquired. The MATRIX surveys sampled through three large areas (purple) identified by BOEM as prospective for gas hydrate
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Multichannel seismic image
Multichannel seismic image collected by the USGS along 2018 MATRIX line 08, which is located ~280 km offshore of the Virginia-Maryland border at a water depth of ~3500 m.
Atlantic Spotted Dolphins
Atlantic spotted dolphins photographed near the R/V Hugh R. Sharp on August 27, 2018 by the protected species visual observers.
Leak Testing Instrumented Pressure Testing Chamber
USGS personnel leak-testing the Instrumented Pressure Testing Chamber (IPTC)
Retrieving airguns
Jenny White McKee and Pete Dal Ferro of the Pacific Coastal and Marine Science Center retrieve two airguns during the 2018 MATRIX cruise aboard the R/V Hugh R. Sharp. The seismic streamer is visible on the winch in the foreground.
Diesel Compressors
Four diesel-powered compressors chained to the deck of the R/V Hugh R. Sharp provided the air to power the seismic sources during the MATRIX cruise.
Sonobuoy launch
Engineering technician Jenny McKee from the USGS Pacific Coastal and Marine Science Center in Santa Cruz, California watches as an expendable sonobuoy leaves the launcher during the 2018 MATRIX cruise on research vessel Hugh R. Sharp. The sonobuoy deploys an antenna used to transmit received seismic signals back to the ship over radio frequencies at distances up
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USGS personnel configuring and deploying the streamer of hydrophone
USGS personnel configuring and deploying the streamer of hydrophone receivers on the R/V Hugh R. Sharp during the MATRIX cruise. In foreground from left to right are Nathan Miller, Wayne Baldwin, and Eric Moore from the USGS Woods Hole Coastal and Marine Science Center.
Timeline of Gas Hydrate Expeditions
Timeline showing past and future drilling and deep-sea coring and borehole logging expeditions as of late 2017. The goal of the permafrost and deepwater marine programs is to evaluate the potential of gas hydrate as a resource, whereas the goal of the academic ocean drilling programs is to focus on critical research questions related to natural gas hydrate deposits. DOE
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USGS in South Korea
Tim Collett, USGS research geologist, presenting at the Korean Institute of Geoscience and Mineral Resources' (KIGAM) international program for geoscience resources.
USGS in Daejon, South Korea
USGS scientists, Bill Waite, Tim Collett, and Seth Haines in front of a archway in Daejeon, South Korea
Core Storage Facility in Daejeon, South Korea
Core storage facility at the the Korean Institute of Geoscience and Mineral Resources in Daejeon, South Korea
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Date published: January 27, 2020Special Issue Highlights One of the Most Extensive Gas Hydrate Datasets Ever Collected
The USGS and its research partners in India and Japan have reported on one of the most extensive data sets ever collected on the occurrence of natural gas hydrate.
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Date published: February 27, 2019The interaction of climate change and methane hydrates is one of the Reviews of Geophysics' top rated articles!
According to Reviews of Geophysics this work received some of the highest count of citations amongst articles published between January 2017 and December 2018.
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Date published: September 20, 2018Seismic Research Cruise Provides New Data on U.S. Atlantic Margin Gas Hydrates
Data acquired by the U.S. Geological Survey on the U.S. Atlantic Margin in August 2018 reveal new information about the distribution of gas hydrates in the sector stretching from the upper continental slope to deep water areas offshore New Jersey to North Carolina.
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Date published: March 8, 2018Modern Perspective on Gas Hydrates
After lying hidden in sediments for thousands of years, delicate frozen gas structures are in the spotlight for both scientific research and the national interest. These structures, known as gas hydrate, are being investigated by scientists the world over for their possible contributions to the global energy mix, as well as their potential interaction with the environment.
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Date published: February 9, 2018USGS Gas Hydrates Project Releases New Fact Sheets!
The USGS Gas Hydrates Project has published two new Fact Sheets. One describes the goals and scope of the Project and the other describes "Gas Hydrates in Nature," including where they form, how they are studied, and why researchers focus on gas hydrates for energy resource and environmental studies.
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Date published: April 14, 2017Proven under Pressure: USGS Advances Capabilities for High-Pressure Seafloor Samples Containing Gas Hydrate
Meet USGS' newest laboratory!
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Date published: January 4, 2017Exploring Gas Hydrates as a Future Energy Source
In the past decade, the development of the Barnett, Eagle Ford, Marcellus, and other shales has dominated the national consciousness regarding natural gas. But in Alaska, another form of natural gas has been the focus of research for decades—methane hydrate.
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Date published: June 16, 2016Atlantic Methane Seeps Surprise Scientists
Recent scientific work has confirmed the source, composition and origin of methane seeps on the Atlantic Ocean seafloor, discovered in 2012, where scientists never expected them to be.
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Date published: March 16, 2015Frozen Heat Features USGS Science
The Gas Hydrates Project at the U.S. Geological Survey (USGS) contributed to a four-year international effort by multiple partners, including the United Nations Environmental Programme (UNEP), to formulate a just-released report entitled, “Frozen Heat: A Global Outlook on Methane Gas Hydrates.”
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Date published: December 10, 2003
Gas Hydrates - Will They be Considered in the Future Global Energy Mix?
For the first time, an international research program involving the Department of the Interior’s U.S. Geological Survey has proven that it is technically feasible to produce gas from gas hydrates. Gas hydrates are a naturally occurring "ice-like" combination of natural gas and water that have the potential to be a significant new source of energy from the world’s oceans and polar regions.
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Date published: December 8, 1997Future energy source, greenhouse gas, drilling hazard ... USGS Scientists Describe Latest on Gas Hydrates
Scientists are taking another look at methane in gas hydrate, which contains perhaps twice as much organic carbon as all fossil fuels on earth. This gas may prove to be an energy resource for the future.
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What are gas hydrates?
Gas hydrates are a crystalline solid formed of water and gas. It looks and acts much like ice, but it contains huge amounts of methane; it is known to occur on every continent; and it exists in huge quantities in marine sediments in a layer several hundred meters thick directly below the sea floor and in association with permafrost in the Arctic...
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Where are gas hydrates found?
Gas hydrates are found in sub-oceanic sediments in the polar regions (shallow water) and in continental slope sediments (deep water), where pressure and temperature conditions combine to make them stable.
Map showing locations where gas hydrate has been... -
Who studies gas hydrates?
Currently, groups of scientists in the U.S., Canada, Norway, Great Britain and Japan are working to try to understand gas hydrates and the role it plays in the global climate and the future of fuels. The USGS Gas Hydrates Project focuses on the study of natural gas hydrates in deepwater marine systems and permafrost areas. The primary goals are:... -
How are gas hydrates studied?
Gas hydrates can be studied in the laboratory, where a machine is used to create the proper pressure and temperature conditions for hydrate formation, or it can be studied in situ using seismic data collected aboard ships and geophysical models. Learn more: USGS Gas Hydrates Lab