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.

n: trade name for a density log. gamma particle n: a short, highly penetrating X-ray emitted by radioactive substances during their spontaneous disintegration. The measurement of gamma particles (sometimes called gamma rays) is the basis for a number of radioactivity well logging methods.

n: a radioactivity well log used to determine formation porosity. The logging tool bombards the formation with neutrons. When the neutrons strike hydrogen atoms in water or oil, gamma rays are released. Since water or oil exists only in pore spaces, a measurement of the gamma rays indicates formation porosity. See radioactivity well Logging.

A log whose source emits neutrons into the formation. Neutrons interact with hydrogen nuclei resulting in an energy loss that is converted to neutron porosity. All hydrocarbons and water contain hydrogen, but the formation usually does not. The amount of

n: see radioactivity well logging.

n: refer to radioactivity logging

n: a record of the natural or induced radioactive characteristics of subsurface formations. Also called nuclear log. See radioactivity well logging.

n: the recording of the natural or induced radioactive characteristics of subsurface formations. A radioactivity log, also known as a radiation log or a nuclear log, normally consists of two recorded curves: a gamma ray curve and a neutron curve. Both help to determine the types of rocks in the formation and the types of fluids contained in the rocks.