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Approximate depth of penetration in EM dipole prospecting

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Summary

FollowingDoll, approximate expressions for the relative contribution to the total signal by various regions of a homogeneous earth have been derived for the nine electro-magnetic dipole-dipole systems. For the three systems with parallel dipole axes, there exists a vertical focussing effect centered around a depth equal to 0.34 times the dipole spacing. For dipoles with perpendicular axes and non-zero signal, there is no focussing and the near-surface material will have an undesirably large influence on the fields measured. Considering all aspects, the system with colinear axes seems to be the best for em prospecting. For this system, the portion of the ground between approximate depths 0.1L and 1.0L accounts for the bulk of the signal,L being the dipole spacing.

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Authors and Affiliations

  1. National Geophysical Research Institute, Hyderabad 7, A.P., India

    A. Roy

Authors
  1. P. A. Paul
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  2. A. Roy
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Additional information

NGRI Contribution No. NGRI-70-160.

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Paul, P.A., Roy, A. Approximate depth of penetration in EM dipole prospecting. PAGEOPH 81, 26–36 (1970). https://doi.org/10.1007/BF00875008

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  • DOI: https://doi.org/10.1007/BF00875008

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