Geophysical logging techniques measure the physical properties of the rock, soil, and water that are penetrated by the well bore. Geophysical logs provide continuous records of the properties of soils and rocks, their contained fluids, and well construction.
Some borehole geophysical tools sample or investigate a volume of rock many times larger than cores or cuttings that may have been extracted from the borehole and record data from rock beyond that disturbed by the drilling process. Other probes measure various chemical and physical characteristics of materials and fluids in and around a borehole.
Delta Geophysics uses many surface geophysical techniques that are related closely to borehole techniques, and the two are often considered together when setting up comprehensive groundwater, environmental, or engineering investigations.
Sub-bottom profiling systems can be useful for characterizing subsurface structure without the need for more intrusive methods such as sediment cores and drilling.
- Identification of lithology and stratigraphic correlation;
- Measuring porosity, permeability, bulk density, and elastic properties;
- Identifying fractures and secondary porosity;
- Locating zones, direction, and quantity of groundwater flow;
- Determining water quality;
- Identifying contaminant plumes;
- Verifying well construction.
Borehole logs provide subsurface data unobtainable by other means. When you need detailed and specific information about your subsurface borings and wells, borehole geophysics is the tool. You can rely on Delta’s broad-based and extensive experience to give you the support you need, process the wells to best show the most important attributes, and provide reliable interpretation when required.