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Thursday, December 20, 2012

Undiscovered conventional and continuous oil and gas resources of the Upper Cretaceous Austin Chalk, U.S. Gulf Coast

Geologic models and evaluation

USGS Publication: Scientific Investigations Report 2012–5159
The Upper Cretaceous Austin Chalk forms a low-permeability, onshore Gulf of Mexico reservoir that produces oil and gas from major fractures oriented parallel to the underlying Lower Cretaceous shelf edge. Horizontal drilling links these fracture systems to create an interconnected network that drains the reservoir.


Wednesday, December 19, 2012

Vitrinite Reflectance Data for Cretaceous Marine Shales and Coals in the Bighorn Basin, North-Central Wyoming and South-Central Montana

USGS Publication: Open-File Report 2012–1254
The purpose of this report is to present new vitrinite reflectance data collected from Cretaceous marine shales and coals in the Bighorn Basin to better characterize the thermal maturity and petroleum potential of these rocks.


Monday, December 17, 2012

Newly Available Stratigraphic Sections in Late Cretaceous and Early Tertiary rocks in and between the Uinta and Piceance Basins of Utah and Colorado

USGS Publications
Scanned copies of three legacy USGS publications with detailed stratigraphy of Late Cretaceous and Early Tertiary rocks in eastern Utah and western Colorado are now available online. MF 1050: five measured sections, in the Mesa Verde Group and Wasatch Formation, in the vicinity of De Beque Colorado including palynological data. MF-1997: eleven detailed measured sections along the Douglas Creek Arch in eastern Utah and western Colorado, including mollusk fossil and palynological data. I-1974: detailed cross sections correlating Upper Cretaceous and Lower Tertiary rocks between the Uinta and Piceance Basins of eastern Utah and western Colorado.


Thursday, December 13, 2012

Interpretation of Na–Cl–Br Systematics in Sedimentary Basin Brines

Comparison of Concentration, Element Ratio, and Isometric Log-ratio

Outside Publication: Mathematical Geosciences
Mathematicians and geochemists have long realized that compositional data intrinsically exhibit a structure prone to spurious and induced correlations. This paper demonstrates, using the Na–Cl–Br system, that these mathematical problems are exacerbated in the study of sedimentary basin brines by such processes as the evaporation or dissolution of salts owing to their high salinities.


Monday, December 03, 2012

Thermal Maturity Map of Devonian Shale in the Illinois, Michigan, and Appalachian Basins of North America

USGS Publication: Scientific Investigations Map 3214
This publication presents a thermal maturity map of Devonian shale in the Illinois, Michigan, and Appalachian basins. The map shows outlines of the three basins (dashed black lines) and an outline of Devonian shale (solid black lines).


Wednesday, November 28, 2012

Remaining Recoverable Petroleum in Giant Oil Fields of the Los Angeles Basin, Southern California

USGS Publication: Fact Sheet 2012–3120, v. 1.1
Using a probabilistic geology-based methodology, a team of U.S. Geological Survey (USGS) scientists recently assessed the remaining recoverable oil in 10 oil fields of the Los Angeles Basin in southern California. The results of the assessment suggest that between 1.4 and 5.6 billion barrels of additional oil could be recovered from those fields with existing technology.


Wednesday, November 28, 2012

Sequential Simulation Approach to Modeling of Multi-seam Coal Deposits with an Application to the Assessment of a Louisiana Lignite

Outside Publication: Natural Resources Research
There are multiple ways to characterize uncertainty in the assessment of coal resources, but not all of them are equally satisfactory. Increasingly, the tendency is toward borrowing from the statistical tools developed in the last 50 years for the quantitative assessment of other mineral commodities. Here, we briefly review the most recent of such methods and formulate a procedure for the systematic assessment of multi-seam coal deposits taking into account several geological factors, such as fluctuations in thickness, erosion, oxidation, and bed boundaries. 


Friday, November 16, 2012

Assessment of Undiscovered Petroleum Resources of the Amerasia Basin Petroleum Province

USGS Publication: Scientific Investigations Report 2012–5146
The Amerasia Basin Petroleum Province encompasses the Canada Basin and the sediment prisms along the Alaska and Canada margins, outboard from basinward margins (hingelines) of the rift shoulders that formed during extensional opening of the Canada Basin. The province includes the Mackenzie delta and slope, the outer shelves and marine slopes along the Arctic margins of Alaska and Canada, and the deep Canada Basin.


Friday, November 16, 2012

Assessment of Undiscovered Petroleum Resources of the Arctic Alaska Petroleum Province

USGS Publication: Scientific Investigations Report 2012–5147
The Arctic Alaska Petroleum Province encompasses all lands and adjacent continental shelf areas north of the Brooks Range-Herald arch tectonic belts and south of the northern (outboard) margin of the Alaska rift shoulder. Even though only a small part is thoroughly explored, it is one of the most prolific petroleum provinces in North America, with total known resources (cumulative production plus proved reserves) of about 28 billion barrels of oil equivalent.


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