In 1978 the GEO-data GmbH was founded as a geological service enterprise. Since that time the GEO-data group has diversified and specialized in different geological and geo-technical areas. The GEO-data, Gesellschaft für Logging Service mbH covers the complete range of surface logging services. A trademark of the GEO-data group is the complete in-house development of all components required for our services including the construction of mud logging units, the analytical equipment and the highly specialized data acquisition and visualization software. The Research & Development department closely co-operates with our customers as well as with partners from science and research. Own developments, such as the fast gas chromatograph (FID), are designed & constructed in the main office in Garbsen. Technically competent, highly motivated and continuously trained employees are the trademark of the whole GEO-data group. They ensure that the geological-technical information are processed, documented, and that samples are accurately and precisely descripted according to the requirements of the client at the well-site. Since 1982 we operate our own accredited laboratory for drinking water-, pollutant- and reservoir water analytics (according to DIN ISO/IEC 17025), equipped with analytical instrumentation of the newest generation such as a Rock Eval 6® analyzer, GC-IRMS, TOC/TC analysators and other. Special focus is layed on our Isotope-Laboratory for mudgas isotope logging.