Energy Resources Program
Sunday, January 22, 2012
USGS Publication: Open-File Report 2011–1261
Coal exploration drill-hole data from over 24,000 wells in 10 States are discussed by State in the chapters of this report, and the data are provided in an accompanying spreadsheet.
Tuesday, January 10, 2012
USGS Publication: Open-File Report 2011–1296This Open-File Report contains downloadable shapefiles representing the coalfields of India and Bangladesh and a limited number of chemical and petrographic analyses of India and Bangladesh coal samples.
Sunday, December 04, 2011
USGS Publication: Data Series 635The principal mission of the U.S. Geological Survey (USGS) Energy Resources Program (ERP) is to (1) understand the processes critical to the formation, accumulation, occurrence, and alteration of geologically based energy resources; (2) conduct scientifically robust assessments of those resources; and (3) study the impacts of energy resource occurrence and (or) their production and use on both the environment and human health.
Tuesday, September 13, 2011
USGS Publication: Open-File Report 2011–1187Geochemistry is a constantly expanding science. More and more, scientists are employing geochemical tools to help answer questions about the Earth and earth system processes. Scientists may assume that the responsibility of examining and assessing the quality of the geochemical data they generate is not theirs but rather that of the analytical laboratories to which their samples have been submitted.
Wednesday, August 31, 2011
Outside Publication: Society for Organic Petrology NewsletterThe tool of measuring "vitrinite reflectance" under a microscope has great value in petroleum exploration and coal utilization, and the reflectance is a simple number, such as 1.4% Ro, with some slight variations depending on technique. This report analyzes here just one factor, "smear" of crude oil on the polished surface (from the sample), which may reduce reflectance because of thin-film interference.
Friday, August 26, 2011
USGS Publication: Open-File Report 2011–1148A review of publicly available coal quality data during the coal resource assessment of the southwestern part of the Powder River Basin, Wyoming, revealed significant problems and limitations with those data. The review processes demonstrated why it is always preferable to research and evaluate the circumstances regarding the sampling and analytical methodology from the original data sources when evaluating coal quality information, particularly if only limited data are available.
Saturday, April 30, 2011
Outside Publication: International Journal of Coal GeologyHower, J.C. and Ruppert, L.F., 2011, Splint coals of the Central Appalachians: petrographic and geochemical facies of the Peach Orchard No. 3 Split coal bed, southern Magoffin County, Kentucky: International Journal of Coal Geology, v. 85, p. 268-275: Outside publication - request copy, email author.
Sunday, March 20, 2011
Outside Publication: The Society of Organic Petrology Energy Resources and Petroleum Systems in the 21st Century - Technical Sessions:
Thursday, December 30, 2010
Outside Publication: International Journal of Coal Geology
For a copy of the report: Email Leslie Ruppert
Thermal maturation patterns of Pennsylvanian strata in the Appalachian basin were determined by compiling and contouring published and unpublished vitrinite reflectance (VR) measurements.
Ruppert, L.F., Hower, J.C., Ryder, R.T., Trippi, M.H., Grady, W.C., and Levine, J.R., 2010, Geologic controls on observed thermal maturation patterns in Pennsylvanian coalbearing rocks in the Appalachian basin: International Journal of Coal Geology, v. 81, no. 3, p. 169-181.
The U.S. Geological Survey (USGS) Energy Resources Program, in cooperation with many agencies and scientists from the world’s coal producing countries, undertook a project, called the World Coal Quality Inventory (WoCQI), to obtain samples of coal from the world’s producing coal mines during a limited period of time (roughly 1995-2006). The resulting WoCQI database is intended to help policy makers with decisions regarding:
This can contribute to the most economically and environmentally efficient global use of coal.
International collaborators were provided sample collecting guidelines and forwarded their samples to the U.S. Geological Survey (USGS). Samples were subsequently analyzed for major-, minor-, and trace-elements at the USGS Inorganic Geochemistry Laboratory located in Denver, CO and for proximate and ultimate analyses at a commercial laboratory located in Pennsylvania using ASTM methods (2007). The resulting dataset, in EXCEL 2003 format, includes samples from 56 countries and is not subject to the inter-laboratory variability present in many coal chemistry compilations.
Not all global coal resource occurrences are included in the WoCQI, but 1,580 individual coal samples were eventually collected for analysis. About 70 percent of the WoCQI samples have data from the commercial laboratory, which are presented on an as-received basis. Values for nearly 50 elements from the USGS laboratory were calculated to a consistent dry, whole-coal basis in the dataset.
The WoCQI database is a unique compilation of coal chemical data and in some cases, the WoCQI data may be the only data available for public use. Care must be used when selecting the sample data for use in statistics or interpretation for the following reasons:
1) There are single samples with little or no spatial variability
2) There is a mix of sample types and collection methods
3) The accuracy of the USGS Inorganic Geochemistry Laboratory major-, minor-, and trace-element data is variable
Five newsletters (see archive) were published during the sample collection phase to keep communications open between international collaborators and the USGS. For samples from South American countries, the USGS published an open-file report in 2006 (Karlsen and others, 2006) and the Indonesian samples in 2007 (Belkin and Tewalt, 2007). Although no Geographic Information System (GIS) files are part of the WoCQI, two publications containing international coal-bearing areas have been produced and can be used in conjunction with the WoCQI chemistry data (western hemisphere: Tewalt and others, 2008 ; Africa: Merrill and Tewalt, 2008). Ongoing coal-related international studies relate to the creation of GIS shape files for coal-bearing areas of the world. Please check the News tab for the most recent releases.
Belkin, H.E., and Tewalt, S.J., 2007, Geochemistry of selected coal samples from Sumatra, Kalimantan, Sulawesi, and Papua, Indonesia: U.S. Geological Survey Open-File Report 2207-1202, available online at http://pubs.usgs.gov/of/2007/1202/
Karlsen, A.W., Tewalt, S.J., Bragg, L.J., and Finkelman, R.B., eds., 2006, The World Coal Quality Inventory: South America: U.S. Geological Survey Open-File Report 2006-1241, available online at http://pubs.usgs.gov/of/2006/1241/
Merril, M.D., and Tewalt, S.J., 2008, GIS Representation of Coal-Bearing Areas in Africa: U.S. Geological Survey Open-File Report 2008-1258, available online at http://pubs.usgs.gov/of/2008/1258/
Tewalt, S.J., Kinney, S.A, and Merrill, M.D., 2008, GIS Representation of Coal-Bearing Areas in North, Central, and South America: U.S. Geological Survey Open-File Report 2008-1257, available online at http://pubs.usgs.gov/of/2008/1257/
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World Coal Quality Inventory (WoCQI) Spatial Viewer:
This viewer allows users to select a country and download underlying data associated with countries that were working collaboratively to sample and inventory coal.
Download All Chemical Data:
Chemical Analyses in the World Coal Quality Inventory, Version 1:
Open-File Report 2010-1196
Additional International Chemical Data [.xls]
Metadata for Additional International Chemical Data [.txt]
Petrographic analyses and selected photomicrographs of WoCQI samples -- Read Me [.docx]
Selected photomicrographs provided by University of Kentucky Center for Applied Energy Research -- Appendix A [.pdf]
Petrographic analyses in spreadsheet format provided by University of Kentucky Center for Applied Energy Research -- Appendix B [.xls]
USGS Frequently Asked Questions (FAQ) Pertaining to "Coal"
Energy Resources Program - Coal Quality
Energy Resources Program - Coal Databases
Energy Resources Program - Geochemistry Laboratories
American Society of Testing Materials (ASTM)
Center for Applied Energy Research
International Committee for Coal & Organic Petrology (ICCP)
The Society for Organic Petrology (TSOP)
Page Last Modified: Friday, October 13, 2017