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2D 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. 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... Categories: Data; Tags: 2D micromodel, Bay of Bengal, Department of Civil and Environmental Engineering, Geophysics, Indian Ocean, All tags... Krishna-Godavari Basin, Laboratory, Louisiana State University, Louisiana State University, Department of Civil and Environmental Engineering, Marine Geology, NGHP-02, NGHP-02-09, NGHP-02-16, Woods Hole Coastal and Marine Science Center, U.S. Geological Survey, bentonite, brine, calcium carbonate, clogging, deionized water, diatoms, earth material properties, fine-grained sediment, gas hydrate resources, geoscientificInformation, illite, image analysis, kaolin, laboratory experiments, mica, natural resource extraction, optical microscopy, permeability, silica silt, soil sciences, Fewer tags Dataset of diatom controls on the sedimentation behavior of fine-grained sediment collected offshore of South Korea during the Second Ulleung Basin Gas Hydrate Expedition, UBGH2 One of the primary goals of South Korea’s second Ulleung Basin Gas Hydrate Expedition (UBGH2) was to examine the geotechnical properties of the marine sediment associated with methane gas hydrate occurrences found offshore of 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. During UBGH2, concentrated gas hydrate was found in two sedimentary environments: gas hydrate was found in thin, coarse-grained sediment layers interbedded with fine-grained sediment (fines, such as clays and muds) and as veins of essentially pure gas hydrate within predominantly fine-grained... Categories: Data; Tags: CMHRP, Coastal and Marine Hazards and Resources Program, East Sea, Geophysics, South Korea, All tags... U.S. Geological Survey, USGS, Ulleung Basin, WHCMSC, Woods Hole Coastal and Marine Science Center, brine, core analysis, deionized water, diatoms, earth material properties, fine-grained sediment, gas hydrate resources, geoscientificInformation, laboratory experiments, oceans, settling, soil sciences, Fewer tags Preliminary global database of known and inferred gas hydrate locations 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... Blake Ridge, Brazil, CMHRP, Canada, Caspian Sea, Chile, Coastal and Marine Hazards and Resources Program, East Sea, Energy Resources Program, Gulf of Mexico, Hikurangi Margin, Hydrate Ridge, India, Indian Ocean, Japan, Korea, Republic of, Lake Baikal, Mackenzie Delta, Mediterranean Sea, Nankai Trough, North Slope, Norwegian Sea, Pacific, Russia, Sea of Japan, Sea of Marmara, South China Sea, Svalbard, Tibetan Plateau, U.S. Geological Survey, USGS, USGS Gas Hydrates Project, Ulleung Basin, WHCMSC, Woods Hole Coastal and Marine Science Center, borehole logging, energy resources, environment, gas hydrate resources, geoscientificInformation, location, marine geology, marine geophysics, oceans, permafrost, Fewer tags Dependence of sedimentation behavior on pore-fluid chemistry for sediment collected offshore South Korea during the Second Ulleung Basin Gas Hydrate Expedition, UBGH2 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... Categories: Data; Tags: CMHRP, Coastal and Marine Hazards and Resources Program, East Sea, Energy Resources, Marine Geology, All tags... Soil Sciences, South Korea, U.S. Geological Survey, USGS, Ulleung Basin, WHCMSC, Woods Hole Coastal and Marine Science Center, brine, core analysis, deionized water, earth material properties, fine-grained sediment, gas hydrate resources, geoscientificInformation, kerosene, laboratory experiments, oceans, settling, soil sciences, Fewer tags Physical Properties of Sediment Collected during India's National Gas Hydrate Program NGHP-02 Expedition in the Krishna-Godavari Basin Offshore Eastern India, 2015 During the spring and summer of 2015, the U.S. Geological Survey participated in India’s National Gas Hydrate Program NGHP-02 expedition in the Krishna-Godavari Basin offshore eastern India. The expedition included conventional and pressure coring of sediment, samples of which were transferred to the U.S. Geological Survey in Woods Hole, MA for post-cruise testing. 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. This work is part of an international NGHP-02 collaboration culminating in... Categories: Data; Tags: Bay of Bengal, Geochemistry, Geophysics, Indian Ocean, Krishna-Godavari Basin, All tags... Marine Geology, core analysis, drilling and coring, geoscientificInformation, grain-size analysis, marine geology, oceans, sedimentology, Fewer tags Dataset of diatom controls on the compressibility and permeability of fine-grained sediment collected offshore of South Korea during the Second Ulleung Basin Gas Hydrate Expedition, UBGH2 One of the primary goals of South Korea’s second Ulleung Basin Gas Hydrate Expedition (UBGH2) was to examine the geotechnical properties of the marine sediment associated with methane gas hydrate occurrences found off the shore of 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. During UBGH2, concentrated gas hydrate was found in two sedimentary environments: thin, coarse-grained sediment layers interbedded with fine-grained sediment (fines, such as clays and muds) and as veins of essentially pure gas hydrate within beds of predominantly fine-grained sediment.... Categories: Data; Tags: CMHRP, Coastal and Marine Hazards and Resources Program, East Sea, Geophysics, South Korea, All tags... U.S. Geological Survey, USGS, Ulleung Basin, WHCMSC, Woods Hole Coastal and Marine Science Center, brine, compressibility, consolidation, core analysis, deionized water, diatoms, earth material properties, fine-grained sediment, gas hydrate resources, geoscientificInformation, laboratory experiments, oceans, permeability, recompresibility, soil sciences, Fewer tags