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Advances in the combined interpretation of seismics with magnetotellurics Normal access

Author: Zoltán Nagy
Journal name: Geophysical Prospecting
Issue: Vol 44, No 6, November 1996 pp. 1041 - 1083
DOI: 10.1111/j.1365-2478.1996.tb00190.x
Organisations: Wiley
Language: English
Info: Article, PDF ( 3.98Mb )

Summary:
Five examples, obtained during exploration for hydrocarbons in the Pannonian Basin of Hungary, are used to show how the interpretation of seismic sections can be usefully complemented by results from MT surveys.

Selection of the most appropriate MT quantities, considered to be proper ‘MT attributes’ for the purpose of visualization as well as recognition of the subsurface structures and the different inversions of MT data is essential for practical integration of seismic and MT surveys.

A new technique providing a semiquantitive MT-attribute pseudosection for the purpose of visualization of the subsurface structures is proposed. The procedure utilizes derivative functions of the phase of MT impedance for visualization and derives estimated depths from the Bostick transformation of Cagniard apparent resistivities.

On the basis of the MT-attribute pseudosections, constructed from the phase derivatives and transformed resistivity data, depths are estimated for interfaces between geological formations with significant resistivity contrast. In particular examples, the interface between the Tertiary sediments and the older basement rocks as well as tectonic fracture zones with decreased resistivity can be resolved.


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