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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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This child page contains qualitative multi-element compositional data from scanning electron microscopy-energy dispersive spectrometry. The data are in the form of element maps and normalized compositional data from spots or areas. These qualitative data are accompanied by backscattered electron images and, in some cases, corresponding optical images. Quantitative measurement of features in a subset of the optical images is also presented. Data collected after July 22, 2019 are subject to secondary data review as required by the Energy and Minerals Mission Area Quality Management System (EMMA QMS). As this process is not yet complete, data collected after July 22, 2019 must be considered preliminary or provisional...


    map background search result map search result map 2D micromodel studies of pore-throat clogging by pure fine-grained sediments and natural sediments from NGHP-02, offshore India Imagery (Optical and SEM), Element Maps (SEM), and Energy Dispersive Spectra (SEM-EDS) of Solids Used in USGS' Study of Hexavalent Chromium Contamination of Ground Water Near Hinkley, CA Imagery (Optical and SEM), Element Maps (SEM), and Energy Dispersive Spectra (SEM-EDS) of Solids Used in USGS' Study of Hexavalent Chromium Contamination of Ground Water Near Hinkley, CA 2D micromodel studies of pore-throat clogging by pure fine-grained sediments and natural sediments from NGHP-02, offshore India