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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.


Friday, March 28, 2014

Coalbed Natural Gas Exploration, Drilling Activities, and Geologic Test Results

2007–2010, in Wainwright, Alaska

USGS Publication: Open-File Report 2014–1004
The U.S. Geological Survey, in partnership with the U.S. Bureau of Land Management, the North Slope Borough, and the Arctic Slope Regional Corporation conducted a four-year study designed to identify, define, and delineate a shallow coalbed natural gas (CBNG) resource with the potential to provide locally produced, affordable power to the community of Wainwright, Alaska.


Wednesday, March 26, 2014

Characterization of the Marcellus Shale Based on Computer-Assisted Correlation of Wireline Logs in Virginia and West Virginia

USGS Publication: Scientific Investigations Report 2013–5131
In an attempt to determine if this scale of deformation is detectable with conventional wireline logs, petrophysical properties (primarily mineralogy and porosity) were measured by interpretation of gamma-ray and bulk-density logs. The results of performing a statistical correlation of wireline logs from nine wells indicated that there are discontinuities within the Millboro Shale (undifferentiated Marcellus Shale and Mahantango Formation) where there are significant thickness differences between wells. 


Friday, March 14, 2014

Series of Five Maps Characterizing Geopressure Gradients Based on Mud Weight Measurements

Covering Part of Southern Louisiana, State, and Federal Waters

Outside Publication: AAPG Datapages
This series of five maps characterizes the subsurface pressure system of southern Louisiana, including the associated State and Federal waters. The five contour maps in this series characterize the depth to the surface defined by the first occurrence of isopressure gradients ranging from 0.60 psi/ft to 1.00 psi/ft, in 0.10-psi/ft increments. The geographical extent of this geopressure-gradient model is delineated on the maps, which encompass one of the most densely drilled regions of southern Louisiana and adjacent areas. 


Thursday, January 16, 2014

Geologic Assessment of Undiscovered Oil and Gas Resources—Oligocene Frio and Anahuac Formations

United States Gulf of Mexico Coastal Plain and State Waters

USGS Publication: Open-File Report 2013–1257
The Oligocene Frio and Anahuac Formations were assessed as part of the 2007 U.S. Geological Survey (USGS) assessment of Tertiary strata of the U.S. Gulf of Mexico Basin onshore and State waters.  Estimated total mean values of technically recoverable, undiscovered resources are 172 million barrels of oil (MMBO), 9.4 trillion cubic feet of natural gas (TCFG), and 542 million barrels of natural gas liquids for all of the Frio and Anahuac assessment units.


Thursday, January 09, 2014

Rock-Eval pyrolysis and vitrinite reflectance results from the Sheep Creek 1 well

Susitna basin, south-central Alaska

USGS Publication: Open-File Report 2013–1307
We used Rock-Eval pyrolysis and vitrinite reflectance to examine the petroleum source potential of rock samples from the Sheep Creek 1 well in the Susitna basin of south-central Alaska. The results show that Miocene nonmarine coal, carbonaceous shale, and mudstone are potential sources of hydrocarbons and are thermally immature with respect to the oil window.


Monday, December 02, 2013

Assessment of Undiscovered Technically Recoverable Oil and Gas Resources of Puerto Rico

USGS Publication: Fact Sheet 2013–3101
Using a geology-based assessment methodology, the U.S. Geological Survey estimated means of 19 million barrels of undiscovered, technically recoverable oil and 244 billion cubic feet of undiscovered natural gas in the Puerto Rico–U.S. Virgin Islands Exclusive Economic Zone.


Friday, July 19, 2013

Commercial Possibilities for Stranded Conventional Gas from Alaska’s North Slope

Journal: Natural Resources Research

Outside Publication
This study defines stranded conventional gas resources as gas in identified (discovered and appraised) conventional oil and gas accumulations which are not currently commercially producible for either physical or economic reasons. The discovered conventional North Slope gas is stranded because there is currently no transportation system to take the gas to a market.


Thursday, July 11, 2013

Petroleum system analysis of the Hunton Group in West Edmond field, Oklahoma

Journal: AAPG Bulletin

Outside Publication
West Edmond field, located in central Oklahoma, is one of the largest oil accumulations in the Silurian–Devonian Hunton Group in this part of the Anadarko Basin. Production from all stratigraphic units in the field exceeds 170 million barrels of oil (MMBO) and 400 billion cubic feet of gas (BCFG), of which approximately 60 MMBO and 100 BCFG have been produced from the Hunton Group. The USGS completed a geologic-based assessment of the undiscovered oil and gas resources of the Anadarko Basin province in western Oklahoma and Kansas, northern Texas, and southeastern Colorado in 2010 (Higley et al., 2011).


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Overview

The USGS Energy Resources Program provides periodic assessments of the oil and natural gas endowment of the United States. New, prioritized, assessment results, as part of the Energy Policy and Conservation Act (EPCA) and the current National Assessment are shown above. Additional EPCA and priority basin assessment results will be posted as they become available.

Christopher Schenk
Project Chief

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USGS Economic Analysis Updated for the National Petroleum Reserve in Alaska (NPRA)

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3 to 4.3 Billion Barrels of Oil in North Dakota and Montana

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Page Last Modified: Monday, January 13, 2014

 

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