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  2. Gamma ray logging - Wikipedia

    en.wikipedia.org/wiki/Gamma_ray_logging

    A common gamma-ray log records the total radiation and cannot distinguish between the radioactive elements, while a spectral gamma ray log (see below) can. For standard gamma-ray logs, the measured value of gamma-ray radiation is calculated from concentration of uranium in ppm, thorium in ppm, and potassium in weight percent: e.g., GR API = 8 ...

  3. Formation evaluation gamma ray - Wikipedia

    en.wikipedia.org/wiki/Formation_evaluation_gamma_ray

    Measurement of natural emission of gamma rays in oil and gas wells are useful because shales and sandstones typically have different gamma ray levels. Shales and clays are responsible for most natural radioactivity, so gamma ray log often is a good indicator of such rocks. In addition, the log is also used for correlation between wells, for ...

  4. Well logging - Wikipedia

    en.wikipedia.org/wiki/Well_logging

    The gamma ray log is particularly useful as shale beds which often provide a relatively low permeability cap over hydrocarbon reservoirs usually display a higher level of gamma radiation. These logs were important because they can be used in cased wells (wells with production casing). WSI quickly became part of Lane-Wells.

  5. Uses of radioactivity in oil and gas wells - Wikipedia

    en.wikipedia.org/wiki/Uses_of_radioactivity_in...

    This bombards the formation with high energy gamma rays. The attenuation of these gamma rays gives an accurate measure of formation density; this has been a standard oilfield tool since 1965. Another source is americium berylium (Am-Be) neutron source used in evaluation of the porosity of the formation, and this has been used since 1950. In a ...

  6. Formation evaluation - Wikipedia

    en.wikipedia.org/wiki/Formation_evaluation

    Thus the presence or absence of gamma rays in a borehole is an indication of the amount of shale or clay in the surrounding formation. The gamma ray log is useful in holes drilled with air or with oil based muds, as these wells have no SP voltage. Even in water-based muds, the gamma ray and SP logs are often run together.

  7. Measurement while drilling - Wikipedia

    en.wikipedia.org/wiki/Measurement_while_drilling

    Measurement while drilling can be cost-effective in exploration wells, particularly in areas of the Gulf of Mexico where wells are drilled in areas of salt diapirs. The resistivity log will detect penetration into salt, and early detection prevents salt damage to bentonite drilling mud. [citation needed]

  8. Spontaneous potential logging - Wikipedia

    en.wikipedia.org/wiki/Spontaneous_potential_logging

    The SP tool is one of the simplest tools and is generally run as standard when logging a hole, along with the gamma ray. SP data can be used to find: Depths of permeable formations; The boundaries of these formations; Correlation of formations when compared with data from other analogue wells; Values for the formation-water resistivity

  9. List of abbreviations in oil and gas exploration and production

    en.wikipedia.org/wiki/List_of_abbreviations_in...

    DIS – DIS-SLS log; DISFL – DISFL DBHC gamma ray log; DISO – dual induction sonic log; DL – development license (United Kingdom), a type of onshore license issued before 1996; DLIST – dip-list log; DLL – dual laterolog (deep and shallow resistivity) DLS – dog-leg severity (directional drilling) DM – dry mate; DMA – dead-man anchor