1887
Volume 21, Issue 1-2
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

Distinctive resistivity and induced polarization (IP) logs, together with long spaced density, gamma ray and neutron-neutron logs, are presented from a test borehole in a sedimentary environment typical of that encountered in the Sydney region. The high-resolution continuous IP logs are the initial results from a more extensive study aimed at investigating the application of resistivity and IP logging to non-metalliferous environments in Australia.

The electrical logging arrays include the dipole-dipole array and the Schlumberger array for various electrode spacings. The resistivity log for the small spacing dipole-dipole array (0.25 m) shows a close correlation with the neutron-neutron log and identifies sandstone porosity variations along with the presence of conductive argillaceous horizons. Continuous logs of chargeability windows provide a pictorial display of variations in the rate of polarization decay along the hole.

Computer aided interpretation of the resistivity and IP logs for a key interval has resulted in a model of 28 layers. The theoretical logs show an excellent match with field logs. These results confirm that the dipole-dipole array provides better resolution of thin conductive layers than conventional logging configurations.

© 1990 ASEG
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1990-03-01
2026-01-13

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References

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  • Article Type: Research Article
Keyword(s): Borehole logging; chargeability; clays; computer modelling; dipole-dipole; Hawkesbury Sandstone; induced polarization; radiometric; resistivity; Schlumberger; spectral IP

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