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Friday, May 31, 2013

Whole Rock Geochemistry and Grain-Size Analyses from Sediment and Rock near Tuba City Open Dump, Tuba City, Arizona

USGS Publication: Open-File Report 2013–1118

A variety of sediment and rock samples were collected in and around Tuba City Open Dump in 2008. Whole rock geochemistry has already been reported for sediment/rock/dune samples in Johnson and others (2008). Many of these samples were sieved in order to get grain-size distributions. The resulting grain-size distributions along with new whole rock geochemistry associated with each grain-size category are provided in this follow-up report. In addition, whole rock geochemistry from cores collected at sites WP-03 and WP-14 and a few X-ray diffraction samples are provided.


Friday, May 31, 2013

Microbial Production of Natural Gas from Coal and Organic-Rich Shale

Publication 
Natural gas is an important component of the energy mix in the U.S, producing greater energy yield per unit weight and less pollution compared to coal and oil. Most of the world's natural gas resource is thermogenic, produced in the geologic environment over time by high temperature and pressure within deposits of oil, coal, and shale. About 20 percent of the natural gas resource, however, is produced by microorganisms (microbes). Microbes potentially could be used to generate economic quantities...


Wednesday, May 29, 2013

Nahcolite and Halite Deposition Piceance Basin, Western Colorado

Nahcolite and Halite Deposition through Time During the Saline Mineral Phase of Eocene Lake Uinta, Piceance Basin, Western Colorado

Publication 
Halite and the sodium bicarbonate mineral nahcolite were deposited during the saline phase of Eocene Lake Uinta in the Piceance Basin, western Colorado. Variations in the area of saline mineral deposition through time were interpreted from studies of core and outcrop. Saline minerals were extensively leached by groundwater, so the original extent of saline deposition was estimated from the distribution of empty vugs and collapse breccias. Vugs and breccias strongly influence groundwater movement, so determining where leaching has occurred is an important consideration for in-situ oil shale extraction methods currently being developed.


Wednesday, May 29, 2013

Reserve Growth of Oil and Gas Fields

Investigations and Applications

USGS Publication: Scientific Investigations Report 2013–5063
The reserve growth of fields has been a topic for ongoing discussion for over half a century and will continue to be studied well into the future. Understanding past methods of estimating future volumes based on the data assembly methods that have been used can lead to a better understanding of their applicability. 


Tuesday, May 28, 2013

Coal resources, reserves and peak coal production in the United States

Outside Publication: International Journal of Coal Geology
In spite of its large endowment of coal resources, recent studies have indicated that United States coal production is destined to reach a maximum and begin an irreversible decline sometime during the middle of the current century. However, studies and assessments illustrating coal reserve data essential for making accurate forecasts of United States coal production have not been compiled on a national basis.


Friday, May 24, 2013

2013 National Assessment Maps and Tables Updates

USGS Publication: NOGA Map Updates
The main objective of the National Assessment of Oil and Gas Project is to assess the potential for undiscovered oil and natural gas resources of the onshore United States. These maps include the latest updates to the basin assessments.


Wednesday, May 22, 2013

Bakken and Three Forks Formations Horizontal Wells in the Williston Basin

Procedure for Calculating Estimated Ultimate Recoveries of Bakken and Three Forks Formations Horizontal Wells in the Williston Basin

USGS Publication
Estimated ultimate recoveries (EURs) are a key component in determining productivity of wells in continuous-type oil and gas reservoirs. EURs form the foundation of a well-performance-based assessment methodology initially developed by the USGS (USGS; Schmoker, 1999). This methodology was formally reviewed by the American Association of Petroleum Geologists Committee on Resource Evaluation (Curtis and others, 2001). 


Wednesday, May 15, 2013

Meeting Asia's Future Gas Import Demand

Future Gas Import Demand with Stranded Natural Gas from central Asia, Russia, Southeast Asia, and Australia

This analysis shows the important contribution that stranded gas from central Asia, Russia, Southeast Asia, and Australia can make in meeting the projected demand for gas imports of China, India, Japan, and South Korea from 2020 to 2040. The estimated delivered costs of pipeline gas from stranded fields in Russia and Central Asia at Shanghai, China, are generally less than delivered costs of liquefied natural gas (LNG). Australia and Malaysia are initially the lowest-costs LNG suppliers. In the concluding section, it is argued that Asian LNG demand is price-sensitive and current Asian LNG pricing procedures are unlikely to be sustainable for gas import demand to attain maximum potential growth. Resource volumes in stranded fields evaluated can nearly meet projected import demands.


Tuesday, May 14, 2013

New Insight on Gas Hydrates in Gulf of Mexico

Gas Hydrate Expedition in Gulf of Mexico in April and May 2013

Technical Announcement
Scientists returned from a 15‑day research expedition in the northern Gulf of Mexico with the best high-resolution seismic data and imagery ever obtained of sediments with high gas hydrate saturations.


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