This is the name of a log measured along a well bore (a well-log). The acronym
T4PL can be found in any (ASCII) log files provided by the logging company. The abreviatin stands for
'Dielectric Propagation Time'. The usage of this log is well established. This log helps to evaluate the time per unit length required for an electromagnetic wave to propagate over some interval in some medium like air, water, drilling fluid, etc.. At a higher level, this can be seen as a measure of the interval transit time (The travel time of a wave over a unit distance, hence the reciprocal of wave velocity).This log usually has the unit
'Time'. This is the 1) The measured or measurable period during which an action, process, or condition exists or continues. 2) The point or period when something occurs. 3) A fixed moment or hour for something to happen, begin, or end. 4) A historical period.
Data for this log is produced by a tool that uses a electromagnetic logging technique and can be used to investigate the time interval of the formation. Similar logs are listed below: