Mineral detection arrangement and method for the detection and characterization of minerals in a borehole

摘要

The invention relates to a mineral detection arrangement and a method for the detection and characterization of minerals in a borehole. The object of the invention to provide an arrangement and a method which allow the detection of certain minerals in an earth formation through which a borehole has penetrated, even for boreholes of small diameter with a good Enable signal-to-noise ratio is achieved by providing a mineral detection arrangement for borehole self-field resonance spectroscopy, which comprises a housing (1) which is suitable for being introduced into a borehole (2) , and external electronics (3a) which are located outside the borehole (2) and are electronically connected to devices of internal electronics (3i) in the housing (1), with an inherent field resonance within the housing (1) Probe (11) is located, the self-field resonance probe (11) consisting of a probe electronics (111) and an antenna (112) bes and an oscillating magnetic field of suitable frequency can be emitted by the antenna (112), which in the radial direction, in the plane perpendicular to the longitudinal axis of the borehole (2) has a low radial location dependence close to the theoretical optimum, which is in an area around the antenna (112), which directly adjoins the surface of the antenna (112), has a proportionality between the magnetic field amplitude and the inverse of the distance B1 ~ 1 / r.