By E Kofi Sakyiamah | Reference(s): Harvest Chemical
Well logging: Gamma Ray Log: The Gamma Ray log is a measurement of the natural radioactivity of the formation because radioactive elements tend to be concentrated in shales. The gamma ray normally reflects the shale content of the formations. The gamma ray log is scaled in gamma API units of radioactivity with high readings causing a deflection of the curve to the right and low radioactivity causing a deflection to the left. Thus, high readings indicate shale and low readings indicate clean non-shaly formations like sandstone, limestone, and dolomite.
However, a clean shale-free sandstone may also produce a high gamma ray response if the sandstone contains mica's, potassium, feldspars, glauconite, or uranium rich formation waters. Thus, the presence of a clean sandstone can be overlooked. If it contains one of these radioactive contaminants. If radioactive contamination is suspected, a type of log called a gamma ray spectral log can be run that breaks the natural radioactivity of a formation in concentrations of potassium, thorium, and uranium.
The poster, Emmanuel Kofi Sakyiamah, is an experienced Petroleum Industry (Oil & Gas Crane Lifter/Rigger, HSSEQ, Materials Coordinator Professional, etc ) who has worked on several exploration and production projects in Africa with GNPC, LUKOIL, NARANS ENERGY, ENI, SPRINGFIELD E&P, etc. You can reach E. Kofi Sakyiamah on +233 245 170 917 or +233 050 200 80 89 to engage him for his professional services with integrity. Article Source/Credit: Harvest Chemical
Well logging: Gamma Ray Log: The Gamma Ray log is a measurement of the natural radioactivity of the formation because radioactive elements tend to be concentrated in shales. The gamma ray normally reflects the shale content of the formations. The gamma ray log is scaled in gamma API units of radioactivity with high readings causing a deflection of the curve to the right and low radioactivity causing a deflection to the left. Thus, high readings indicate shale and low readings indicate clean non-shaly formations like sandstone, limestone, and dolomite.
However, a clean shale-free sandstone may also produce a high gamma ray response if the sandstone contains mica's, potassium, feldspars, glauconite, or uranium rich formation waters. Thus, the presence of a clean sandstone can be overlooked. If it contains one of these radioactive contaminants. If radioactive contamination is suspected, a type of log called a gamma ray spectral log can be run that breaks the natural radioactivity of a formation in concentrations of potassium, thorium, and uranium.
The poster, Emmanuel Kofi Sakyiamah, is an experienced Petroleum Industry (Oil & Gas Crane Lifter/Rigger, HSSEQ, Materials Coordinator Professional, etc ) who has worked on several exploration and production projects in Africa with GNPC, LUKOIL, NARANS ENERGY, ENI, SPRINGFIELD E&P, etc. You can reach E. Kofi Sakyiamah on +233 245 170 917 or +233 050 200 80 89 to engage him for his professional services with integrity. Article Source/Credit: Harvest Chemical
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