GAMMA RAY LOG
•Gamma Rays are high-energy electromagnetic waves which are emitted by atomic nuclei as a form of radiation
•Gamma ray log is measurement of natural radioactivity in formation verses depth.
•It measures the radiation emitting from naturally occurring U, Th, and K.
•It is also known as shale log.
•GR log reflects shale or clay content.
•Clean formations have low radioactivity level.
•Correlation between wells,
•Determination of bed boundaries,
•Evaluation of shale content within a formation,
•Mineral analysis,
•Depth control for log tie-ins, side-wall coring, or perforating.
•Particularly useful for defining shale beds when the sp is featureless
•GR log can be run in both open and cased hole
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