DLL. A [[formation resistivity factor|formation resistivity]] log made from a system consisting of both very deep and shallow investigative [[laterolog]] schemes. The tool records, in combination, deep and shallow laterolog [[curve|curves]] and a [[gamma ray]] and/or [[SP]] [[curve]]. The dual laterolog-R<sub>xo</sub>, is a simultaneously recorded dual laterolog which also includes [[flushed zone]] [[resistivity]] information derived from a micro-[[Spherically Focused Log|Spherically Focused Logging]] device. See also [[laterolog]]. DLL is a mark of Schlumberger.

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