Interpretation of Thick Conductive Zones using Time-Domain EM Parasections

Michael W. Asten

doi:10.1071/EG00595

ISSN: 0812-3985
E-ISSN: 1834-7533

Interpretation of Thick Conductive Zones using Time-Domain EM Parasections
Authors Michael W. Asten^a
View Affiliations Hide Affiliations

^a Department of Earth SciencesMonash University, Clayton, Vic, 3168, Ph. 03 9421 1077, Fax: 03 9421 1099, Email: [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 31, Issue 4, Sep 2000, p. 595 - 602
DOI: https://doi.org/10.1071/EG00595
- Received: 14 Mar 2000
- Published online: 01 Sep 2000

Abstract

Conductivity-depth images of moving-loop time-domain EM data assist in distinguishing between near-surface and deep conductors. Use of differential conductivity provides improved resolution of conductors relative to the spiked conductivity of Smith et al. (1994). The conductance parameter is complementary to differential conductivity, in providing superior detection of conductors at depth under a conductive overburden. Field and model data from Frazers Plateau shows how differential conductivity-depth images assist in distinguishing between a wide surficial conductor and a deep basement conductor. Field and model data from the Ernest Henry mineral deposit show that the conductance parameter is superior in identifying the location of a weak, deep horizontal basement conductor (the primary mineralisation with conductance order 25 S) when it is under the conductive overburden characteristic of that environment (7 S).

Article metrics loading...

/content/journals/10.1071/EG00595

2000-09-01

2026-01-15

From This Site

/content/journals/10.1071/EG00595

dcterms_title,dcterms_subject,pub_keyword

-contentType:Journal -contentType:Contributor -contentType:Concept -contentType:Institution

10

5

Full text loading...

References

Asten, M.W., 1987, Full transmitter waveform transient EM modelling and inversion for soundings over coal measures: Geophysics, 52, 279-287.
Asten, M.W., 1998, On the use of conductance and differential conductivity in TEM parasections (CDI): Expanded Abstracts of the 68th International Exposition and Annual Meeting of the Society of Exploration Geophysicists, New Orleans, Sept 1998.
Brescianini, R.F., Asten, M.W., and McLean, N., 1992, Geophysical Characteristics of the Eloise Cu-Au deposit: Exploration Geophysics 23, 33-42.
Eaton, P.A., and Hohmann, G.W., 1986, Technique for rapidly estimating resistivity of the earth from transient electromagnetic soundings: Presented at the 86th Annual Meeting, Society of Exploration Geophysicists, Extended Abstracts, 52- 54.
Eaton, P.A., and Hohmann, G.W., 1989, A rapid inversion technique for transient electromagnetic soundings: Physics of the Earth and Planetary Interiors, 53, 384- 404.
Eaton, P.A., 1998, Application of an improved technique for interpreting transient electromagnetic data: Exploration Geophysics, 29, 175-183.
Encom, 1996, EMVision Reference Manual: Encom, Sydney.
Fullagar, P.F., 1989, Generation of conductivity-depth pseudo-sections from coincident and in-loop TEM data: Exploration Geophysics, 20, 43-45.
Hohmann, G. W. and Newman, G. A., 1990, Transient electromagnetic responses of surficial, polarizable patches (short note): Geophysics, 55, 1098-1100.
Huang, H., and Fraser, D.C., 1996, The differential parameter method for multifrequency airborne resistivity mapping: Geophysics, 61, 100-109.
Liu, G. and Asten, M., 1993, Conductance-depth imaging of airborne TEM data: Exploration Geophysics, 24, 655-662.
Liu, G., 1995, Three-dimensional modelling of transient electromagnetic data acquired in Qld, Australia: Proceedings of Three-Dimensional Electromagnetics Symposium, Schlumberger-Doll Research, Connecticut, 541-551.
Liu, G., 1999, Three-dimensional modelling of transient electromagnetic data acquired in Qld, Australia, in Oristaglio, M., and Spies, B.R., Eds., Threedimensional electromagnetics: Society of Exploration Geophysicists, 502-514.
Macnae, J.C. and Lamontagne, Y., 1987, Imaging quasi-layered conductive structures by simple processing of transient electromagnetic data: Geophysics, 52, 545-554.
Macnae, J.C., Smith, R.S., Polzer, B.D., Lamontagne, Y., and Klinkert, P.S., 1991, Conductivity-depth imaging of airborne electromagnetic step-response data: Geophysics, 56, 102-114.
Monks, T., and Asten, M.W., 1994, TEMPER. a software package for the interactive interpretation of airborne transient EM data: Exploration Geophysics, 24, 719- 724.
Newman, G. A., Hohmann, G. W. and Anderson, W. L., 1986, Transient electromagnetic response of a three-dimensional body in a layered earth: Geophysics, 51, 1608-1627.
Raiche, A.P., and Spies, B.R., 1981, Coincident-loop transient electromagnetic master curves for interpretation of two-layer earths: Geophysics, 50, 1628-1633.
Silic, J., 1989, Interpretation of TDEM data using first and second spatial derivatives and time-decay analysis: Exploration Geophysics, 20, 57-64.
Smith, R. S. and West, G. F., 1989, Field examples of negative coincident-loop transient electromagnetic responses modeled with polarizable half-planes: Geophysics, 54, 1491-1498.
Smith, R.S., and Buselli, G., 1991, Examples of data processed using a new technique for presentation of coincident and in-loop impulse-response transient electromagnetic data: Exploration Geophysics, 22, 363-368.
Smith, R.S., Edwards, R.N., and Buselli, G., 1994, Automatic technique for presentation of coincident-loop, impulse-response transient electromagnetic data: Geophysics, 59, 1542-1550.
Tartaras, E., and Zhdanov, Michael S., 1996, Fast S-inversion in the time domain: Method of interpretation using the thin sheet approach: 66th Annual Internat. Mtg., Soc. Exploration Geophysics, Expanded Abstracts, 1306-1309.
Webb, M., and Rowston, P., 1995, The geophysics of the Ernest Henry Cu-Au deposit (N.W. Qld): Exploration Geophysics, 26, 51-59.
Xiong, Z. and Tripp, A.C., 1995, A block iterative algorithm for 3-D electromagnetic modeling using integral equations with symmetrized substructures: Geophysics, 60, 291-295.

/content/journals/10.1071/EG00595

Article Type: Research Article

Keyword(s): conductivity-depth; conductivity-depth images; electromagnetic imaging; electromagnetic sounding; Ernest Henry; Frazers Plateau; parasection

Most Cited This Month Most Cited RSS feed

- A comparison of smooth and blocky inversion methods in 2D electrical imaging surveys
  
  Authors M.H. Loke, Ian Acworth and Torleif Dahlin
- Reverse-Time Migration using the Poynting Vector
  
  Authors Kwangjin Yoon and Kurt J. Marfurt
- SkyTEM–a New High-resolution Helicopter Transient Electromagnetic System
  
  Authors K. I. Sorensen and Esben Auken
- An overview of a highly versatile forward and stable inverse algorithm for airborne, ground-based and borehole electromagnetic and electric data
  
  Authors Esben Auken, Anders Vest Christiansen, Casper Kirkegaard, Gianluca Fiandaca, Cyril Schamper, Ahmad Ali Behroozmand, Andrew Binley, Emil Nielsen, Flemming Effersø, Niels Bøie Christensen, Kurt Sørensen, Nikolaj Foged and Giulio Vignoli
- The Fast Marching Method: An Effective Tool for Tomographic Imaging and Tracking Multiple Phases in Complex Layered Media
  
  Authors Nicholas Rawlinson and Malcolm Sambridge
- 3-D Analytic Signal in the Interpretation of Total Magnetic Field Data at Low Magnetic Latitudes
  
  Authors Ian N. MacLeod, Keith Jones and Ting Fan Dai
- CMP cross-correlation analysis of multi-channel surface-wave data
  
  Authors Koichi Hayashi and Haruhiko Suzuki
- A new direct non-invasive groundwater detection technology for Australia
  
  Authors M. Schirov, A. Legchenko and G. Creer
- 3D inversion of airborne electromagnetic data using a moving footprint
  
  Authors Leif H. Cox, Glenn A. Wilson and Michael S. Zhdanov
- Notes On Rock Magnetization Characteristics In Applied Geophysical Studies
  
  Authors D. A. Clark and J. B. Emerson
More Less

Interpretation of Thick Conductive Zones using Time-Domain EM Parasections

Abstract

Most Read This Month

Most Cited This Month Most Cited RSS feed