Borehole geophysics

The borehole geophysics is the branch of geophysics , the subject of the investigation of boreholes is and the surrounding terrestrial body. These special will borehole measuring instruments used, which are inserted into the well.

Drill holes are lithological , petrophysical , reservoir engineering properties and gefügekundliche and of drilling data recorded. Mainly geoelectric , magnetic , acoustic , radar and radioactivity methods are used. Borehole measurements are the most important measuring method for deep boreholes and have largely replaced the time-consuming and costly coring of drilling sections .

The measurement diagrams ( logs ) are used by correlation with the measurement results from neighboring boreholes for stratigraphic classification. The borehole measurements are of particular importance in the detection and identification of deposits (e.g. oil or gas zones). In addition, the reservoir geological parameters can be derived and interpreted from the measurement diagrams (thickness, rock porosity , hydrocarbon saturation ). The method is also used in the monitoring of deep wells in the drinking water supply, in geothermal energy in the energy sector as well as for thermal water production .

literature

• Fabrizio Jauch: Using borehole geophysics for geotechnical classifications of crystalline rock masses in tunneling. Dissertation 2000, Eidgenössische Technische Hochschule Zürich , Diss. ETHZ No. 13663, ( abstract , pdf)

Web links

• What are logs and what are borehole measurements? , Institute for Applied Geophysics, RWTH Aachen , www.geophysik.rwth-aachen.de - also on the Integrated Ocean Drilling Program (IODP) [1]
• Borehole geophysics , Hessian State Office for Nature Conservation, Environment and Geology (HLNUG), www.hlnug.de - using the example of the core drilling in Vogelsberg 2007 to research the largest closed volcanic area in Central Europe (14-17 mya)
• Supraregional projects within the framework of the implementation of the Deposits Act , Department of Geophysics, Federal Geological Institute Vienna, www.geologie.ac.at - Overview of soil geophysical measurements in the context of natural space-potential-related investigations in Austria (ÜLG-35 / F)