Ellog auger drilling: Three-in-one method for hydrogeological data collection

Kurt Sørensen, Flemming Larsen

Research output: Contribution to journalArticleResearchpeer-review

13 Citations (Scopus)


The Ellog auger drilling method is an integrated approach for hydrogeological data collection during auger drilling in unconsolidated sediments The drill stem is a continuous flight, hollow-stem auger with integrated electrical and gamma logging tools. The geophysical logging is performed continuously while drilling. Data processing is carried out in the field, and recorded log features are displayed as drilling advances. A slotted section in the stem, above the cutting head, allows anaerobic water and soil-gas samples to be taken at depth intervals of approximately 0.2 m. The logging, water, and gas sampling instrumentation in the drill stem is removable; therefore, when the drill stem is pulled back, piezometers can be installed through the hollow stem. Cores of sediments can subsequently be taken continuously using a technique in which the drill bit can be reinserted after each coring. The Ellog auger drilling method provides detailed information on small-scale changes in lithology, sediment chemistry, and water, as well as gas compositions in aquifer systems data essential to hydrogeological studies.

Original languageEnglish
Pages (from-to)97-101
Number of pages5
JournalGround Water Monitoring and Remediation
Issue number4
Publication statusPublished - Nov 1999
Externally publishedYes

Programme Area

  • Programme Area 2: Water Resources


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