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Friday, July 25, 2014

Inference of strata separation and gas emission paths in longwall overburden using continuous wavelet transform of well logs and geostatistical simulation

Outside Publication: Journal of Applied Geophysics
Prediction of potential methane emission pathways from various sources into active mine workings or sealed gobs from longwall overburden is important for controlling methane and for improving mining safety. The aim of this paper is to infer strata separation intervals and thus gas emission pathways from standard well log data. The proposed technique was applied to well logs acquired through the Mary Lee/Blue Creek coal seam of the Upper Pottsville Formation in the Black Warrior Basin, Alabama, using well logs from a series of boreholes aligned along...


Tuesday, July 22, 2014

Spatial and Stratigraphic Distribution of Water in Oil Shale of the Green River Formation Using Fischer Assay, Piceance Basin, Northwestern Colorado

The spatial and stratigraphic distribution of water in oil shale of the Eocene Green River Formation in the Piceance Basin of northwestern Colorado was studied in detail using some 321,000 Fischer assay analyses in the U.S. Geological Survey oil-shale database. The oil-shale section was subdivided into 17 roughly time-stratigraphic intervals, and the distribution of water in each interval was assessed separately. This study was conducted in part to determine whether water produced during retorting of oil shale could provide a significant amount of the water needed for an oil-shale industry. Recent estimates...


Wednesday, July 16, 2014

Assessment of Undiscovered, Technically Recoverable Oil and Gas Resources of Armenia, 2014

National and Global Petroleum Assessment

USGS Publication: Fact Sheet 2014–3048
Using a geology-based assessment methodology, the U.S. Geological Survey estimated mean volumes of 1 million barrels of undiscovered, technically recoverable conventional oil and 6 billion cubic feet of undiscovered, technically recoverable conventional natural gas in Armenia.


Sunday, June 15, 2014

The use of solvent extractions and solubility theory to discern hydrocarbon associations in coal, with application to the coal–supercritical CO2 system

Outside Publication: Organic Geochemistry
Samples of three high volatile bituminous coals were subjected to parallel sets of extractions involving solvents dichloromethane (DCM), carbon disulfide (CS2), and supercritical carbon dioxide (CO2) (40 °C, 100 bar) to study processes affecting coal–solvent interactions. Recoveries of perdeuterated surrogate compounds, n-hexadecane-d34 and four polycyclic aromatic hydrocarbons (PAHs), added as a spike prior to extraction, provided further insight into these processes.


Wednesday, June 11, 2014

Geologic Framework for the National Assessment of Carbon Dioxide Storage Resources—Alaska North Slope and Kandik Basin, Alaska

USGS Publication: Open-File Report 2012–1024–I
Chapter I - This report presents fourteen storage assessment units (SAUs) from the Alaska North Slope and two SAUs from the Kandik Basin of Alaska. The Alaska North Slope is a broad, north-dipping coastal plain that is underlain by a thick succession of sedimentary rocks that accumulated steadily throughout much of the Phanerozoic during three major tectonic sequences: the Mississippian through Triassic Ellesmerian sequence, the Jurassic through Lower Cretaceous Beaufortian sequence, and the Cretaceous and Tertiary Brookian sequence.


Wednesday, June 04, 2014

Brine Contamination to Aquatic Resources from Oil and Gas Development in the Williston Basin, United States

USGS Publication: Scientific Investigations Report 2014-5017
The Williston Basin, which includes parts of Montana, North Dakota, and South Dakota in the United States and the provinces of Manitoba and Saskatchewan in Canada, has been a leading domestic oil and gas producing region for more than one-half a century. Currently, there are renewed efforts to develop oil and gas resources from deep geologic formations, spurred by advances in recovery technologies and economic incentives associated with the price of oil.


Monday, June 02, 2014

The Devonian Marcellus Shale and Millboro Shale

Outside Publication: GSA Field Guides 35, 2014
This field trip will examine a number of natural and engineered exposures in the vicinity of the West Virginia–Virginia state line, where participants will have the opportunity to view a variety of sedimentary facies within the Marcellus shale itself, sedimentary structures, tectonic structures, fossils, overlying and underlying formations, volcaniclastic ash beds, and to view a basaltic intrusion.


 

Page Last Modified: Friday, August 01, 2014

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