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Gamma Log
BestPractices If multiple wells are drilled within a geothermal field, correlating the gamma radiation data with depth can help to correlate lithologies between wells. Natural faulting of the system can alter the depth to the various layers between the wells.  +
DataAcquisition A detector located within a wireline probe
A detector located within a wireline probe is lowered into the well and typically measures the gamma ray intensity when raised from the bottom. The detector can either be a scitillation counter (Thallum doped sodium iodice crystal) or Geiger-Muller tubes record and transmit the total radioactivity that is displayed as the gamma ray log.
ty that is displayed as the gamma ray log.  +
EnvironmentalMitigation Measures associated with well drilling and well logging operations.  +
EstimatedCostHighUSD 75 centUSD (7.5e-4 kUSD, 7.5e-7 MUSD, 7.5e-10 TUSD)  +
EstimatedCostLowUSD 25 centUSD (2.5e-4 kUSD, 2.5e-7 MUSD, 2.5e-10 TUSD)  +
EstimatedCostMedianUSD 38 centUSD (3.8e-4 kUSD, 3.8e-7 MUSD, 3.8e-10 TUSD)  +
EstimatedTimeHigh 0.00189 years (16.56 hours, 0.69 days, 0.0986 weeks, 0.0227 months)  +
EstimatedTimeLow 9.582478e-4 years (8.4 hours, 0.35 days, 0.05 weeks, 0.0115 months)  +
EstimatedTimeMedian 0.00189 years (16.56 hours, 0.69 days, 0.0986 weeks, 0.0227 months)  +
ExplorationCostPerMetric foot  +
ExplorationGroup Downhole Techniques +
ExplorationSubGroup Well Log Techniques +
ExplorationTimePerMetric job  +
FieldProcedures Typically run as one logging method in a standard suite of bore-hole logs.  +
LithologyInfo provides information on changes in rock type near the wellbore from changes in measured gamma radiation  +
NEPAanalysis NA  +
Name Gamma Log  +
OpenEI/PageDescription About Gamma Log, a geothermal exploration technique, including areas of use.  +
OpenEI/PageKeyword geothermal  + , exploration  + , techniques  + , Gamma Log  + , areas  +
Pitfalls Mostly shales and sandstones account for most of the gamma radiation. However, there are some other rocks such as some carbonates or feldspar rich rock types that produce radiation and could hinder the accurate detection of the sands and shales.  +
References [http://www.glossary.oilfield.slb.com/Disp
[http://www.glossary.oilfield.slb.com/Display.cfm?Term=gamma%20ray%20log Schlumberger Oilfield Glossary- Gamma Ray Log] [http://www.os.is/gogn/unu-gtp-sc/UNU-GTP-SC-12-24.pdf Geothermal Well Logging: Geological Wirelog and Fracture Imaging, Benedikt Steingrimsson, 2011] Keys, W. Scott and MacCary, 1971, Applications of Gorehole Geophysical to Water-Resources Investigations, in, Techniques of Water-Resourcws Investigations of the United states Geological Syrvey, 126p.
the United states Geological Syrvey, 126p.  +
StratInfo using multiple gamma logs over an area, the depth to the sandstone and shale layers can be correlated over larger areas  +
TypeOf Well Log Techniques +
Has query
"Has query" is a predefined property that represents meta information (in form of a subobject) about individual queries and is provided by Semantic MediaWiki.
Gamma Log + , Gamma Log + , Gamma Log + , Gamma Log + , Gamma Log + , Gamma Log + , Gamma Log + , Gamma Log + , Gamma Log + , Gamma Log +
Has processing error
"Has processing error" is a predefined property provided by Semantic MediaWiki and represents errors that appeared in connection with improper value annotations or input processing.
Gamma Log + , Gamma Log + , Gamma Log +
Categories Exploration Techniques , Geothermal , Well Log Techniques , Gamma Log
Modification date
"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by Semantic MediaWiki.
20:55:57, 14 October 2013  +
hide properties that link here 
Gamma Log At Alum Area (Moos & Ronne, 2010) + , Gamma Log At Coso Geothermal Area (1977) + , Gamma Log At Flint Geothermal Area (DOE GTP) + , Gamma Log At Fort Bliss Area (Combs, Et Al., 1999) + , Gamma Log At Lightning Dock Geothermal Area (Witcher, 2006) + , Gamma Log At Raft River Geothermal Area (1979) + , Gamma Log At Silver Peak Area (DOE GTP) + , Gamma Log At Valles Caldera - Redondo Geothermal Area (Rowley, Et Al., 1987) + ExplorationTechnique
Exploration-Related Technique - Gamma + redirect page
 
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