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United State Environmental Protection Agency

A field-based characterization of conductivity in areas of minimal alteration: a case example in the Cascades of northwestern United States

oregon-cascades-play-fairway-analysis-faults-and-heat-flow-maps

The National Renewable Energy Laboratory in the US specializes in the research and development of renewable energy, energy efficiency, energy systems integration, and sustainable transportation.

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National Renewable Energy Laboratory (NREL)

This fault density probability surface was created using simple probability kriging, with a log-normal transformation of the data. The following density parameters were used: probability >= 0.5 km length/area considering a search radius of 5 km and a cell size of 1 km. The input faults were from the USGS Quaternary fault and fold database of the United States and faults mapped by team members at Oregon State University. 

Oregon Cascades Fault Density Probability.zip

This is a probability map of heat flow in the Cascades in Oregon where a threshold of 80 wM/m squared was used. Probability was calculated using simple kriging with declustering. The data used for this statistical surface were down-loaded from the Southern Methodist University Geothermal Laboratory.

Oregon Cascades Heat Flow Probability.zip

Faults are characterized as: (1) Highest Confidence: Clear offset of previously mapped geologic units. Previously mapped on published sources (labeled in attribute table). Clear topographic expression of fault scarp. Admissible with regional structure trends. (2) No clear offset of previously mapped geologic units (many units are very broadly defined and internally complex) Probable intra-unit offset. Previously mapped on published sources (labeled in attribute table). Clear topographic expression of fault scarp. Admissible with regional structure trends. (3) Intermediate Confidence/New Fault: These are interpretations of faults never mapped before. No offset of previously mapped geologic units. Probable intra-unit offset. Not previously mapped on published maps. Clear topographic expression of fault scarp. Admissible with regional structure trends. Interpreter is very confident that this is a fault revealed by LiDAR that has not been previously recognized. (4) No offset of previously mapped geologic units. Not previously mapped on published sources. Moderate topographic expression of scarp. Admissible with regional structure trends. Interpreter is moderately confident that this is a fault revealed by LiDAR that has not been previously recognized. (5) Lowest Confidence: No offset of previously mapped geologic units. Not previously mapped on published sources. Weak topographic expression of scarp. Interpreter has low confidence that this is a fault revealed by LiDAR that has not been previously recognized. These are sublinear trends that have potential to be faults, but are unclear. These features are mapped so that they are not ignored, and so that future reviewers do not suspect them to be features overlooked during interpretation.

Oregon Faults.zip

Link to the project page for the Southern Methodist University node of the National Geothermal Data System from which the data used for the heat flow probability map were downloaded.

SMU Node of the NGDS

Oregon Cascades Play Fairway Analysis: Faults and Heat Flow Maps

oregon-cascades-play-fairway-analysis-maps

This is a map of land ownership accompanied by hot spring locations. The map was made by John Trimble in 2015 at Oregon State University.

Land Ownership Map.pdf

This is a map of the spatial distribution of mafic and felsic quaternary volcanic rocks across the Oregon Cascades; accompanied by a fault distribution. The map was made by John Trimble in 2015 at Oregon State University.

Quaternary Volcanic Rocks Map.pdf

This is a prediction heat flow contour map that was created using default kriging. Data points are also shown on the map. The map was made by John Trimble, in 2015, at Oregon State University.

Prediction Heat Flow Contour Map.pdf

This is a data point map of Magnesium Concentrations in mg/L, accompanied by a fault map; made by John Trimble in 2015 at Oregon State University.

Magnesium Concentrations Map.pdf

This is a data point map of Chloride concentration in mg/L, accompanied by a fault confidence map; made by John Trimble, in 2015, at Oregon State University.

Chloride Concentration Map.pdf

This is a map of the spatial distribution of faults, with level of confidence, accompanied by geothermal spring point data. This map was made by John Trimble in 2015 at Oregon State University.

Fault Map.pdf

This is a data point map of silica concentrations in mg/L, accompanied by fault confidence lines; made by John Trimble in 2015 at Oregon State University.


Silica Concentrations Map.pdf

This is a data point map of alkalinity measurements in mmol/L. These data are accompanied by a fault confidence map. The map was made by John Trimble, in 2015, at Oregon State University.

Alkalinity Measurements Map.pdf

This is a map of the spatial distribution of geochemistry sampling locations across the Oregon Cascades; accompanied by a fault map. The map was made by John Trimble in 2015 at Oregon State University.

Geochemistry Sampling Locations.pdf

Oregon Cascades Play Fairway Analysis: Maps

oregon-cascades-play-fairway-analysis-raster-datasets-and-models

This is the mafic rock layer used in the development of the Oregon Cascades heat composite risk segment used for play fairway analysis. Mafic erruptive centers, taken from the USGS Oregon state geologic map, were buffered at 2km and then rasterized. Values of 1 indicate the presence of mafic extrusive areas and values of 0 indicate no mafic extrusive areas. Extensive flows are not mapped.

Basaltic Rocks.zip

This is the Quaternary felsic rock layer used in the development of the Oregon Cascades heat composite risk segment used for play fairway analysis. Felsic erruptive centers, taken from the USGS Oregon state geologic map, were buffered at 2km and then rasterized. Values of 1 indicate the presence of felsic eruptive areas and values of 0 indicate no felsic eruptive areas. Extensive flows are not mapped

Felsic Rocks.zip

This is the heat composite risk segment (CRS) used for play fairway analysis in the Oregon Cascades. This CRS was created using probability kriging statistical surfaces representing (1) Quaternary felsic intrusive and extrusive rock with a weighting of 0.24; (2) Quaternary mafic extrusive rock with a weighting of 0.06; (3) heat flow with a weighting of 0.15; and (4) magnetotelluric conductors with a weighting of 0.55. These data were integrated using the Weighted Sums method in ArcGIS. This dataset has been normalized with a range of 0-1.

Heat Composite Risk Segment.zip

This is the permeability composite risk segment (CRS) used for play fairway analysis in the Oregon Cascades. CRS was created using probability kriging statistical surfaces representing (1) Quaternary fault density with a weighting of 0.65; (2) Magnetotelluric conductors with a weighting of 0.35. These data were integrated using the Weighted Sums method in ArcGIS. This dataset has been normalized with a range of 0-1.

Permeability Composite Risk Segment.zip

This is a final geothermal play fairway analysis model of the Oregon Cascades. It was created using a heat compostite risk segment with a weighting of 0.65 and a permeability composite risk segment with a weighting of 0.35. Data integration was done using the ArcGIS Weighted Sum method. This dataset has been normalized to a range of 0-1.

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