Bohrlochsonden

Bohrlochsonden, also known as borehole probes or well logging tools, are instruments lowered into boreholes to measure and record physical properties of the surrounding rock and fluid formations. These measurements, collectively called well logging, are crucial for understanding subsurface geology, evaluating hydrocarbon reservoirs, assessing groundwater resources, and monitoring environmental conditions.

The probes are typically lowered by a wireline cable or attached to a drill string. They operate by emitting and detecting various types of signals. Common logging techniques include electrical resistivity logging, which measures how well a formation conducts electricity, indicating the presence of fluids like water or hydrocarbons. Gamma-ray logging detects natural radioactivity in the rocks, helping to differentiate lithologies and identify shale formations. Acoustic logging measures the travel time of sound waves through the rock, providing information about porosity and rock strength. Nuclear logging techniques, such as neutron and density logging, use radioactive sources to determine the hydrogen content (related to fluid saturation) and bulk density of the formations, respectively.

Data acquired by Bohrlochsonden are transmitted to the surface in real-time or recorded for later analysis. These logs provide a detailed vertical profile of the borehole, enabling geologists and engineers to interpret the subsurface environment, identify potential resource targets, and make informed decisions regarding drilling, production, and environmental management. Specialized probes exist for measuring temperature, pressure, flow rate, and for performing imaging of the borehole wall.