one of the pioneer companies in electric well logging, named for the French scientist who first developed the method. Today, many companies provide logging services of all kinds.

Related Terms

• Well Logging

the recording of information about subsurface geologic formations, including records kept by the driller and records of mud and cutting analyses, core analysis, drill stem tests, and electric, acoustic, and radioactivity procedures. See acoustic log, core analysis, driller’s log, drill stem test, electric well log, mud analysis, and radioactivity well logging....

• Cement Bond Survey

an acoustic survey or sonic logging method that records the quality or hardness of the cement used in the annulus to bond the casing and the formation. Casing that is well bonded to the formation transmits an acoustic signal quickly; poorly bonded casing transmits a signal slowly. See acoustic survey, acoustic well logging....

• Proved Developed Reserves

Proved Developed Reserves are those Proved Reserves that can be expected to be recovered through existing wells and facilities and by existing operating methods. Improved recovery reserves can be considered as Proved Developed Reserves only after an improved recovery project has been installed and favorable response has occurred or is expected with a reasonable degree...

• PNDP

Abbr. Proved Developed Non Producing (reserves). See also Proved Developed Reserves....

• Sonce

a logging tool assembly, especially the device in the logging assembly that senses and transmits formation data....