| 摘要 |
The invention concerns devices for orienting a drill core (1) sampled in a rocky environment subjected, during its formation, to earth's magnetic field. The inventive device comprises a bed (2), a cradle (3), means (4) for associating the cradle with the bed, means (7) for driving the drill core in rotation, means (8) for measuring the magnetic field prevailing in one measurement point (10), said means consisting of a polar part (100) comprising an air gap (101) matching the shape of the lateral wall (102) of the drill core (1) which is driven in a rotational movement in the air gap (101) and at least a magnetic coil (13) enclosing the polar part, and means (11) for processing the measurement signal delivered by the magnetic coil. The invention is useful for orienting drill cores sampled in oil-bearing terrain.
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