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Filters Date Range Past year (0) Past month (0) Past week (0) Past day (0) Custom range... To   Search Contacts Paul C Hackley Aaron M Jubb U.S. Geological Survey U.S. Geological Survey - ScienceBase Javin J Hatcherian More... Categories Data (2) Tag Types Theme (2) USGS Scientific Topic Keyword (2) Harvest Set (2) Place (1) Tag Schemes USGS Thesaurus (2) Geographic Names Information System (GNIS): https://geonames.usgs.gov/apex/f?p=138:1:0::::: (1) View Results as: JSON ATOM CSV

Investigating the effects of broad ion beam milling to sedimentary organic matter To test if reflectance increases to sedimentary organic matter (vitrinite) caused by broad ion beam (BIB) milling were related to molecular aromatization and condensation, we used Raman and Fourier transform infrared (FTIR) spectroscopies to evaluate potential compositional changes in the same vitrinite locations pre- and post-BIB milling. The same locations also were examined by atomic force microscopy (AFM) to determine topographic changes caused by BIB milling (as expressed by the areal root-mean-square roughness parameter Rq). Samples consisted of four medium volatile bituminous coals. We used a non-aggressive BIB milling approach with conditions of [(5 min, 4 keV, 15°incline, 360° rotation at 25 rpm and 100%... Categories: Data; Tags: Bituminous Coal, Broad Ion Beam, Coal resources, Energy Resources, Geochemistry, All tags... Ion Milling, Pennyslvania, Sedimentary Organic Matter, Thermal Maturity, USGS Science Data Catalog (SDC), Vitrinite reflectance, Fewer tags Nanoscale Molecular Composition of Solid Bitumen from the Eagle Ford Group Across a Natural Thermal Maturity Gradient Solid bitumen is a petrographically-defined secondary organic matter residue produced during petroleum generation and subsequent oil transformation. The presence of solid bitumen impacts many shale reservoir properties including porosity, permeability, and hydrocarbon generation and storage, amongst others. Furthermore, solid bitumen reflectance is an important parameter for assessing the thermal maturity of formations with little to no vitrinite. While the molecular composition of solid bitumen will strongly impact associated parameters such as the development of organic matter porosity, hydrocarbon generation, and optical reflectance, assessing the molecular composition of solid bitumen in situ within shale reservoirs... Categories: Data; Tags: Energy Resources, Geochemistry, Oil and gas resources, Organic matter, Shale, All tags... USGS Science Data Catalog (SDC), Unconventional oil and gas, atomic force microscopy-based infrared spectroscopy (AFM-IR), Fewer tags