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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. Using two-dimensional (2D) micromodels to test the conditions in which clogging occurs provides insights for choosing production operation parameters that optimize methane recovery in the field. During methane extraction, several processes can alter the mobility and clogging potential of fines: (1) fluid flow as the formation is depressurized to release methane from gas hydrate, (2) shifting pore-fluid...
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These are metadata related to the collection of samples on the FK190612 research expedition in the north Pacific Ocean along the Cascadia margin in June 2019. Samples were collected to examine characteristics of methane emissions from seafloor seeps at the edge of hydrate stability and the associated communities.
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One goal of Korea’s second Ulleung Basin Gas Hydrate Expedition, UBGH2, is to examine geotechnical properties of the marine sediment associated with methane gas hydrate occurrences found offshore eastern Korea in the Ulleung Basin, East Sea. Methane gas hydrate is a naturally occurring crystalline solid that sequesters methane in individual molecular cages formed by a lattice of water molecules. Offshore Korea, gas hydrate is found in thin, coarse-grained sediment layers that are interbedded with fine-grained sediment. Methane gas hydrate is a potential energy resource, but whether extracting methane from gas hydrate in these layered marine environments is technically and economically viable remains an open research...
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For more than 25 years, the U.S. Geological Survey Gas Hydrates Project has compiled and maintained an internal database of locations where the existence of gas hydrate has been confirmed or inferred in research studies. The existence of gas hydrate was considered confirmed when gas hydrate was recovered by researchers or videotaped from a vehicle (such as a submersible or remotely operated vehicle) near the sea floor. The existence of gas hydrate was considered inferred when seismic data, borehole logs, or certain geochemical characteristics match anomalies known to characterize gas hydrate. This data release provides a text description of the region, geographic coordinates, and the citation for the published reference...
Categories: Data; Tags: Alaska North Slope, Arctic, Atlantic, Beaufort Sea, Black Sea, All tags...
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One goal of the Indian National Gas Hydrate Program's NGHP-02 expedition was to examine the geomechanical response of marine sediment to the extraction of methane from gas hydrate found offshore eastern India in the Bay of Bengal. Methane gas hydrate is a naturally occurring crystalline solid that sequesters methane in individual molecular cages in a lattice of water molecules. Methane gas hydrate is a potential energy resource, but whether extracting methane from gas hydrate in the marine subsurface is technically and economically viable remains an open research topic as of 2018. This data release provides insight about a poorly quantified aspect of this process: the reaction of fine-grained sediment particles...
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One goal of the Indian National Gas Hydrate Program's NGHP-02 expedition was to examine the geomechanical response of marine sediment to the extraction of methane from gas hydrate found offshore eastern India in the Bay of Bengal. Methane gas hydrate is a naturally occurring crystalline solid that sequesters methane in individual molecular cages in a lattice of water molecules. Methane gas hydrate is a potential energy resource, but whether extracting methane from gas hydrate in the marine subsurface is technically and economically viable remains an open research topic as of 2018. This data release provides insight about a poorly quantified aspect of this process: the reaction of fine-grained sediment particles...
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This report summarizes data acquired from 1990 to 1994 forthe gas-hydrate portion of the USGS project "Permafrostand gas hydrate as possible sources of methane" of theUSGS Global Change and Climate History program. Theobjective of this project has been to test the hypothesisthat gas hydrate deposits of the Beaufort Sea continentalshelf are destabilized by the ~10�C temperature increasethat has resulted from the Holocene transgression of theArctic Ocean. To test this idea we have selected an areaoff the north coast of Alaska centered on Harrison Bay. Wehave measured the concentration of methane in surficialsediments, in the water column when ice is present andabsent, and in seasonal sea ice. Our results show thatmore...
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This report consists of two-dimensional marine seismic reflection profile datafrom the northern Gulf of Mexico. These data were acquired in 1998 and 1999with the Research Vessels Tommy Munro (M1-98-GM) and Gyre (G1-99-GM). The data are availablein binary and GIF image formats. Binary data are in Society of ExplorationGeologists (SEG) SEG-Y format and may be downloaded for further processing ordisplay. Reference maps and GIF images of the profiles may be viewed with yourWeb browser.


    map background search result map search result map High-resolution multichannel seismic-reflection data acquired in thenorthern Gulf of Mexico, 1998-99 Methane in coastal sea water, sea ice, and bottomsediments, Beaufort Sea, Alaska 2D micromodel studies of pore-throat clogging by pure fine-grained sediments and natural sediments from NGHP-02, offshore India Characteristic Settling Time and Interface Height Dependence on Pore Fluid Chemistry for Sediment Collected From Area B, During India's National Gas Hydrate Program Expedition NGHP-02 Dependence of sedimentation behavior on pore-fluid chemistry for sediment collected offshore South Korea during the Second Ulleung Basin Gas Hydrate Expedition, UBGH2 Sample collection metadata for the FK190612 expedition along the Cascadia margin in June 2019 Preliminary global database of known and inferred gas hydrate locations Characteristic Settling Time and Interface Height Dependence on Pore Fluid Chemistry for Sediment Collected From Area B, During India's National Gas Hydrate Program Expedition NGHP-02 Dependence of sedimentation behavior on pore-fluid chemistry for sediment collected offshore South Korea during the Second Ulleung Basin Gas Hydrate Expedition, UBGH2 High-resolution multichannel seismic-reflection data acquired in thenorthern Gulf of Mexico, 1998-99 Sample collection metadata for the FK190612 expedition along the Cascadia margin in June 2019 Methane in coastal sea water, sea ice, and bottomsediments, Beaufort Sea, Alaska Preliminary global database of known and inferred gas hydrate locations