A revised inversion model parameter formulation for fixed wing transmitter loop ? towed bird receiver coil time-domain airborne electromagnetic data  

Authors / CoAuthors

Lane, R.J.L. | Brodie, R.C. | Fitzpatrick, A.

Abstract

The conversion of data to conductivity for fixed wing transmitter loop ? towed bird receiver coil time-domain airborne electromagnetic (AEM) systems such as TEMPEST would ideally utilise complete knowledge of the system geometry and measurements for all 3 mutually perpendicular components of the received signal. In practice, not all of this information is available. A layered inversion formulation is described that integrates the supplied data from a TEMPEST survey with a priori conductivity information from the survey area. Total (primary plus secondary) field data from both the X (horizontal in-line) and Z (vertical) components are used. Receiver coil pitch angle and transmitter loop to receiver coil horizontal and vertical separation parameters are included as variable model parameters to be estimated. Borehole conductivity data are used to assign a reference conductivity model that acts as a constraint to stabilise the partitioning of the measured signal into primary field and ground response contributions. Smoothness constraints are applied to the conductivity values in the 1D model. The quality of the inversion output was assessed through comparison of the conductivity predictions with borehole conductivity values and shallow single-frequency ground EM measurements. An improvement in accuracy of the predictions was demonstrated compared with that of two previous sets of conductivity predictions.

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nonGeographicDataset

eCat Id

61121

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Keywords

• External PublicationConference Paper

( Theme )

• AEM

( Theme )

• geophysics

Australian and New Zealand Standard Research Classification (ANZSRC)

• Earth Sciences

• Published_Internal

Publication Date

2004-01-01T00:00:00

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Australian Government Security ClassificationSystem    

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Creative Commons Attribution 4.0 International Licence    

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