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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).


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