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Thursday, September 29, 2011

Evolution of overpressured and underpressured oil and gas reservoirs

An Overview of the Anadarko Basin of Oklahoma, Texas, and Kansas

USGS Publication: Open-File Report 2011–1245
Departures of resistivity logs from a normal compaction gradient indicate that overpressure previously extended north of the present-day overpressured zone. These indicators of paleopressure, which are strongest in the deep basin, are mapped to the Kansas-Oklahoma border in shales of Desmoinesian age.


Thursday, September 29, 2011

Undiscovered Petroleum Resources for the Woodford Shale and Thirteen Finger Limestone–Atoka Shale Assessment Units, Anadarko Basin

USGS Publication: Open-File Report 2011–1242
In 2010 the USGS assessed undiscovered oil and gas resources for the Anadarko Basin Province of Colorado, Kansas, Oklahoma, and Texas. The assessment included three continuous (unconventional) assessment units (AU). Mean undiscovered resources for the Devonian Woodford Shale Gas AU are about 16 trillion cubic feet of gas (TCFG) and 192 million barrels of natural gas liquids (MMBNGL); Woodford Shale Oil AU are 393 million barrels of oil (MMBO), 2 TCFG, and 59 MMBNGL; and Pennsylvanian Thirteen Finger Limestone–Atoka Shale Gas AU are 6.8 TCFG and 82 MMBNGL.


Thursday, September 29, 2011

U.S. Geological Survey Science for the Wyoming Landscape Conservation Initiative

2010 Annual Report

USGS Publication: Open-File Report 2011–1219
This is the third report produced by the U.S. Geological Survey (USGS) for the Wyoming Landscape Conservation Initiative (WLCI) to detail annual work activities. New in this year's report is an additional section for each work activity that outlines the work planned for the following fiscal year.

 


Monday, September 26, 2011

Assessment of Undiscovered Oil and Gas Resources of Libya and Tunisia, 2010

USGS Publication: Fact Sheet 2011–3105
Using a geology-based assessment methodology, the U.S. Geological Survey estimated means of 3.97 billion barrels of undiscovered oil, 38.5 trillion cubic feet of undiscovered natural gas, and 1.47 billion barrels of undiscovered natural gas liquids in two provinces of North Africa.

 


Monday, September 19, 2011

Assessment of Coal Geology, Resources, and Reserves in the Southwestern Powder River Basin, Wyoming

USGS Publication: Open-File Report 2011–1134
The total original coal resource in the Southwestern Powder River Basin assessment area for 23 coal beds, with no restrictions applied was calculated to be 369 billion short tons. Available coal resources, which are part of the original resource that is accessible for potential mine development after subtracting all restrictions, are about 341 billion short tons (92.4 percent of the total original resource). Approximately 61 percent are at depths between 1,000 and 2,000 ft, with a modeled price of about $30 per short ton.


Wednesday, September 14, 2011

Rare earth element of the Khanneshin carbonatite complex, Helmand Province, Afghanistan

Includes mineralogy, geochemistry, and a preliminary resource assessment

USGS Publication: Open-File Report 2011-1207
We report and describe a significant new deposit of light rare earth elements (LREE), estimated at 1 Mt, within the Khanneshin carbonatite complex of south Afghanistan. This report reviews the geologic setting of LREE deposit, presents new geochemical data documenting the grade of LREE mineralization, briefly describes the mineralogy and mineralogical associations of the deposit, and presents a preliminary estimate of LREE resources based on our current understanding of the geology.


Tuesday, September 13, 2011

Quality Assurance and Quality Control of Geochemical Data

A Primer for the Research Scientist

USGS Publication: Open-File Report 2011–1187
Geochemistry 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.


Monday, September 12, 2011

Tracking solutes and water from subsurface drip irrigation application of coalbed methane–produced waters, Powder River Basin, Wyoming

Outside Publication: Environmental Geosciences
Coalbed methane (CBM) is a source of natural gas that is recovered by dewatering coal beds and collecting volatile compounds, such as methane, that are desorbed from the coal. One method to beneficially use water produced from coalbed methane (CBM) extraction is subsurface drip irrigation (SDI) of croplands. This article reports on initial results from tracking water and solutes from the injected CBM-produced waters at an SDI system in Johnson County, Wyoming.


Thursday, September 08, 2011

Assessment of Potential Shale Gas and Shale Oil Resources of the Norte Basin, Uruguay, 2011

USGS Publication: Fact Sheet 2011–3100
Using a performance-based geological assessment methodology, the U.S. Geological Survey estimated mean volumes of 13.4 trillion cubic feet of potential technically recoverable shale gas and 0.5 billion barrels of technically recoverable shale oil resources in the Norte Basin of Uruguay.


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