دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: usually refers to drill exploration well in the radioactivity, geochemistry and gravity abnormal area.

the unit of radioactivity used for natural gamma-ray logs.

n: a special type of radioactivity- logging survey used to measure die relative amount of chlorine in the formation. Rocks with low chlorine content are likely to contain gas or oil;rocks with high chlorine content usually contain salt water only.

n: See salinity logging.

v: to relate subsurface information obtained from one well to that of others so that the formations may be charted and their depths and thicknesses noted. Correlations are made by comparing electrical well logs, radioactivity logs, and cores from different wells.

to compare logging and core or other information and account for discrepancies.

n: a special radioactivity log for open-hole surveying that responds to variations in the specific gravity of formations. It is a contact log (i.e., the logging tool is held against the wall of the hole). It emits neutrons and then measures the secondary gamma radiation that is scattered back to the detector in the instrument. The density log is an excellent porosity-measure device, especially for shaley sands. Some trade names are Formation Density Log, Gamma- Gamma Density Log, and Densilog.

one of a number of logging techniques that estimate the density of the formation.

high clay content or higher natural radioactivity signature on the gamma-ray log.

a clayiness index determined from the difference between the radioactivity level of the zone of interest and that of clean rock compared to the difference between the radioactivity level in clay shale and that in the clean rock.

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: in a logging tool, a shutter like device that opens and closes very quickly to permit a measurement of the time a formation is exposed to sound, radioactivity, or other energy;usually timed in millionths of a second (microseconds).