Exploration Technique: Core Analysis
|Exploration Technique Information|
|Exploration Group:||Lab Analysis Techniques|
|Exploration Sub Group:||Rock Lab Analysis|
|Parent Exploration Technique:||Rock Lab Analysis|
|Information Provided by Technique|
|Lithology:||Core analysis is done to define lithology.|
|Stratigraphic/Structural:|| Core analysis can locate faults or fracture networks.
Oriented core can give additional important information on anisotropy.
|Thermal:||Thermal conductivity can be measured from core samples.|
|Low-End Estimate (USD):|| 2,000.00|
200,000 centUSD/ 30 foot core
|Median Estimate (USD):|| 10,000.00|
1,000,000 centUSD/ 30 foot core
|High-End Estimate (USD):|| 25,000.00|
2,500,000 centUSD/ 30 foot core
|Low-End Estimate:|| 1 weeks|
0.0192 years/ job
|Median Estimate:|| 4 weeks|
0.0767 years/ job
|High-End Estimate:|| 8 weeks|
0.153 years/ job
- "Core drilling is an exploration technique that has potential to identify the reservoir and determine where further drilling should take place. This drilling technique is also referred to as “slim-hole drilling.”'"`UNIQ--ref-00000001-QINU`"' The actual rock analysis begins with identifying general characteristics of the sample, then select samples are sent to labs for a more detailed investigation. This is a very common exploration technique to identify or “prove” a geothermal resource and costs can range widely. Costs typically depend on drilling conditions and depth of the well. [[File:Diamond_Core.jpg|thumb|500px|center|A box of rock core samples obtained from a diamond core drilling rig. Photo from , contributed under GNU licensing on June 5, 2006." cannot be used as a page name in this wiki.
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Typical Core Analysis Techniques:
Thin Section - Petrographic thin sections are very thin (~30 microns) slices of a rock mounted on a glass slide which can be viewed under a petrographic microscope to determine microscopic rock textures, mineral assemblages, provenance, porosity, and possibly reservoir quality.
X-Ray Diffraction (XRD) - This technique is used to quantitatively characterize the mineralogical composition of a rock sample. There are various XRD machines and techniques, but typically a rock sample is crushed into a fine powder which is packed and mounted onto a stage that is analyzed by X-rays. The X-ray detector captures this information which gets plotted onto a diffractogram where characteristic peaks can be identified as specific minerals.
Scanning Electron Microscope (SEM) - To investigate 3-D micro-morphology of a rock sample or fracture surface the SEM is a common technique to use. The SEM uses an electron beam to generate a 3-D image that can zoom from 20X to 20,000X (0.05 micron scale range). The SEM also provides semi-qualitative elemental composition of the material under investigation using an energy dispersive spectrometer (EDS).
Electrical Resistivity - Core samples can be used to generate electrical impedance maps which can provide details about the heterogeneity and petrographic controls on electrical properties.
Ultrasonic compressional and shear velocities - Velocities are sensitive to rock type and porosity, but there are also other variables that can influence velocity, such as textural and mineralogical variations.
Reflectance Spectroscopy - A portable Analytical Spectral Device (ASD) spectrometer can be a fast way to analyze core at the well site and determine the general mineral composition of logged core. This technique is not as robust as thin section, XRD, or SEM, but can be a valuable tool to rapidly characterize a core sample and identify which sections need a more detailed analysis.
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- Alum Geothermal Area
- Black Warrior Area
- Blue Mountain Geothermal Area
- Colado Geothermal Area
- Coso Geothermal Area
- Desert Peak Area
- Dunes Geothermal Area
- Fenton Hill HDR Geothermal Area
- Fish Lake Valley Area
- Flint Geothermal Area
- Fort Bliss Area
- Gabbs Valley Area
- Geysers Area
- International Geothermal Area Indonesia
- International Geothermal Area Philippines
- Jemez Mountain Area
- Kilauea East Rift Geothermal Area
- Kilauea Summit Area
- Lake City Hot Springs Area
- Long Valley Caldera Geothermal Area
- Mcgee Mountain Area
- Medicine Lake Area
- Newberry Caldera Area
- Raft River Geothermal Area
- Silver Peak Area
- Snake River Plain Geothermal Region
- U.S. West Region
- Valles Caldera - Sulphur Springs Geothermal Area
- Yellowstone Caldera Geothermal Region