Oil/Gas and Mineral Exploration applications
Our wide range of magnetic field measuring instruments has a number of uses in oil and mineral exploration, including:
Measurement while drilling (MWD)
With operation to 175oC and 215oC respectively, our Mag610 & Mag611 three-axis fluxgate probes are designed for MWD applications, and for any applications requiring high shock and temperature resistance.
Miniature high-temperature probe Mag614 is also designed for integration into MWD tools. It enables the accurate measurement of the position and orientation of the drilling tool. It is built for 175oC and has a reduced size, measuring just 25x10x20mm.
In addition to measurement in boreholes, in order to improve steering in directional drilling on land, the Mag-01H DI declinometer/inclinometer system is used to measure the declination and inclination of the geomagnetic field, before drilling commences. This allows the user to generate accurate maps of local anomalies which are to be accounted for during drilling. The same measurements can be performed at sea, using Mag-03 magnetic field sensors.
Time domain and controlled source electromagnetics TDEM/CSEM
Whilst TDEM and CSEM traditionally rely on induction coil sensors as a receiver, in cases of very conductive targets, signal decay is very slow, and DC or very low frequency measurements are required. Fluxgate sensors detect this secondary field, and can measure over the frequency range from DC to 1kHz. Our Mag-03 and Mag-13 low-noise sensors can be used for this purpose – the Mag-03MS or Mag-13MS for ground work, and the Mag-03MCUP or Mag-13U unpackaged for borehole work. The Mag-03MSS and Mag-13MCD can be used for offshore CSEM.
Stratigraphical work/core logging correlation
The MS2/MS3 magnetic susceptibility system is used for stratigraphical work on cores, providing additional information for petrophysical studies. For both mineral and oil exploration, if cores are extracted, the Bartington MS2/MS3 meter combined with the MS2C probe will permit fine stratigraphical work on the cores. In the context of oil exploration, magnetic susceptibility provides a proxy for permeability measurements, with results obtained in much less time than conventional measurements. Over several cores, distribution of layers enables the user to determine the geometry of a structure (oil trap).
Borehole magnetic susceptibility
Using the Bartington BSS-02B sonde, measuring borehole magnetic susceptibility determines the variation in susceptibility within a borehole at high spatial resolution. In diamond exploration, ore-bearing kimberlites with very high susceptibility will be easily detectable with the BSS-02B sonde. Iron ore bodies will also have an increased susceptibility, the intensity of the susceptibility helping to characterise the percentage of iron in the rocks.
ANApplication Notes CSCase Studies