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Wednesday, January 28, 2015

Historical Hydraulic Fracturing Trends and Data Unveiled in New USGS Publications

USGS News Release & Publications  
Two new USGS publications that highlight historical hydraulic fracturing trends and data from 1947 to 2010 are now available. This national analysis of data on nearly 1 million hydraulically fractured wells and 1.8 million fracturing treatment records from 1947 through 2010 is used to identify hydraulic fracturing trends in drilling methods and use of proppants (sand or similar material suspended in water or other fluid to keep fissures open), treatment fluids, additives, and water in the United States.

 


Tuesday, January 27, 2015

USGS Compilation of Geographic Information System (GIS) Data Representing Coal Mines and Coal-Bearing Areas in China

USGS Publication: Open-File Report 2014-1219
Geographic information system (GIS) information may facilitate energy studies, which in turn provide input for energy policy decisions. The U.S. Geological Survey (USGS) has compiled geographic information system (GIS) data representing the known coal mine locations and coal-mining areas of China as of 2001. These data are now available for download, and may be used in a GIS for a...


Monday, January 26, 2015

U.S. Geological Survey Carbon Sequestration – Geologic Research and Assessments

Outside Publication: Energy Procedia
In 2007, the U.S. Energy Independence and Security Act authorized the U.S. Geological Survey (USGS) to conduct a national assessment of geologic storage resources for anthropogenic carbon dioxide (CO2) and to evaluate the national technically recoverable hydrocarbon resources resulting from CO2 injection and storage through CO2-enhanced oil recovery (CO2-EOR)...


Monday, January 26, 2015

Noble gas geochemistry investigation of high CO2 natural gas at the LaBarge Platform, Wyoming, USA

Outside Publication: Energy Procedia
A regional sampling of gases from thermal springs near the LaBarge Field, Wyoming, USA to determine the extent of the total carbon dioxide system (TCDS) indicates that the system may extend up to 70 km to the northwest of the field. Geochemical evidence from noble gas isotopes, stable element isotopes, and gas composition provide the foundation for these conclusions. Samples from Soda Springs to the west and Grand Teton National Park to the north do not exhibit the potentially diagnostic LaBarge...


Monday, January 26, 2015

Significance of carbon dioxide density estimates for basin-scale storage resource assessments

Outside Publication: Energy Procedia
The geologic carbon dioxide (CO2) storage resource size is a function of the density of CO2 in the subsurface. The pressure and temperature of the storage reservoir at depth affect the CO2 density. Therefore, knowing these subsurface conditions allows for improved resource estimates of potential geologic CO2 storage capacity. In 2012, the U.S. Geological Survey (USGS) completed an assessment of geologic CO2 storage resources for large sedimentary basins in onshore and State waters areas of the U.S...


Monday, January 26, 2015

The U. S. Geological Survey carbon dioxide storage efficiency value methodology: Results and observation

Outside Publication: Energy Procedia
In order to complete the 2013 U.S. Geological Survey (USGS) assessment of carbon dioxide (CO2) storage resources [1], a methodology was needed to determine the CO2 storage efficiency of individual rock strata [2]. The method that was used involved a storage efficiency approximation by MacMinn et al. [3], combined with a brine viscosity model by Mao and Duan [4], and thermal and pressure data from petroleum fields across basins [5]...


Saturday, January 24, 2015

Cokriging of compositional balances including a dimension reduction and retrieval of original units

Outside Publication: Journal of the Southern African Institute of Mining and Metallurgy
Compositional data constitutes a special class of quantitative measurements involving parts of a whole. The sample space has an algebraic-geometric structure different from that of real-valued data. A subcomposition is a subset of all possible parts. When compositional data values include geographical locations, they are also regionalized variables. In the Earth sciences, geochemical analyses are a common form of regionalized compositional data...


Saturday, January 24, 2015

Robust and resistant semivariogram modeling using a generalized bootstrap

Outside Publication: Journal of the Southern African Institute of Mining and Metallurgy
The bootstrap is a computer-intensive resampling method for estimating the uncertainty of complex statistical models. We expand on an application of the bootstrap for inferring semivariogram parameters and their uncertainty. The model fitted to the median of the bootstrap distribution of the experimental semivariogram is proposed as an estimator of the semivariogram...


Thursday, January 22, 2015

Seismic monitoring at the Decatur, IL, CO2 sequestration demonstration site

Outside Publication: Energy Procedia
The viability of carbon capture and storage (CCS) to reduce emissions of greenhouse gases depends on the ability to safely sequester large quantities of CO2 over geologic time scales. One concern with CCS is the potential for induced seismicity. We report on ongoing seismic monitoring by the U.S. Geological Survey (USGS) at a CCS demonstration site in Decatur, IL, in an effort to understand the potential hazards posed by injection-induced seismicity associated with geologic CO2 sequestration...


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