SPWLA Glossary

An electronic storage device which delays the measured signal. Different logging measurements made simultaneously by one downhole instrument quite often do not have the same measure point. For example, one system may be located above another and, therefore, when logging “up,” the upper will record entry into a formation while the other is still below the formation. The upper logging system measurements must be delayed or memorized to play back at the measure point of the lower device so that all measurements will be recorded on film simultaneously and at the same depth.