دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a type of radioactivity well log that records natural radioactivity around the wellbore. Shales generally pr0- duce higher levels of gamma radiation and can be detected and studied with the gamma ray tool. In holes where salty drilling fluids are used, electric logging tools are less effective than gamma ray tools. See radioactivity well logging.

Uses a scintillation crystal and a photomultiplier tube to measure naturally occurring and artificially induced gamma-ray radiation. The gamma-ray radiation is a signature of the formations in a well – very useful in depth control. Used in open hole or pi

n: a special gamma ray log that reveals the relative amounts of radioactive uranium, thorium, and potassium in a formation. This information can help identify shales and clays.

n: A common and inexpensive measurement of the natural emission of gamma rays by a formation. Gamma ray logs are particularly helpful because shales and sandstones typically have different gamma ray signatures that can be correlated readily between wells

n: a density log in which a gamma ray log, a Densilog, and a caliper log are recorded simultaneously.

n: one combination logging which record curve of gamma-ray logging、density logging、caliper logging，is used to compare。

abbr: gray;used in drilling reports.

gamma ray log.

an activation log.

abbr: naturally occurring radioactive materials.

a naturally occurring radioactive scale. Usually Barium Sulfate scale with Uranium or Radium atoms substituted into the lattice structure. Can be detected downhole with a gamma ray log.

a radioactive tag or marker in the casing threads or the perforation that can quickly and positively be found wit h a gamma ray log.