Gamma-ray logging is a geophysical method used in borehole logging to measure the natural radioactivity of geological formations, helping to identify lithology and correlate stratigraphic layers. It is particularly useful in distinguishing between shale and non-shale formations due to the higher concentration of radioactive isotopes in shale.

Gamma-ray Logging

Gamma-ray logging

geophysical method

Borehole logging is a geophysical method used to obtain a detailed record of the geological formations penetrated by a borehole, providing critical data for evaluating potential oil, gas, and mineral deposits. This process involves deploying various logging tools into the borehole to measure physical properties such as electrical resistivity, density, and acoustic velocity, which help in characterizing subsurface conditions and guiding drilling decisions.

borehole logging

Natural radioactivity is the spontaneous decay of unstable atomic nuclei found in nature, resulting in the emission of radiation. This process is responsible for the natural background radiation that all living organisms are exposed to, originating from sources such as cosmic rays and terrestrial elements like uranium, thorium, and radon.

natural radioactivity

Geological formations are naturally occurring groupings of rock layers that have a distinct, recognizable composition and structure, which are used to interpret Earth's history and geological processes. They provide critical insights into past environments, climate changes, and the movement of tectonic plates over geological time scales.

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