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  | isbn    = 0-89181-602-X
 
  | isbn    = 0-89181-602-X
 
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A regional exploration program to study a large unexplored area in the Colombian [http://http://www.greatestplaces.org/notes/amazon.htm Amazon basin] was conducted by [http://http://www.britannica.com/EBchecked/topic/21168/Amoco-Corporation Amoco Production Company] in 1987 and 1988.<ref name=ch16r2>Burgett, W., A., Orange, A., Sigal, R., F., 1992, Integration of MT, seismic, gravity, and magnetic data for reconnaissance of the Colombian Amazon: 54th meeting, European Association of Exploration Geophysicists, Expanded Abstracts, p. 428–499.</ref> This study area was very large approximately 300,000 km<sup>2</sup> (115,000 mi<sup>2</sup>) and remote with dense jungle cover, rugged terrain, and limited road access.
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A regional exploration program to study a large unexplored area in the Colombian [http://http://www.greatestplaces.org/notes/amazon.htm Amazon basin] was conducted by [http://http://www.britannica.com/EBchecked/topic/21168/Amoco-Corporation Amoco Production Company] in 1987 and 1988.<ref name=ch16r2>Burgett, W. A., A. Orange, and R. F. Sigal, 1992, Integration of MT, seismic, gravity, and magnetic data for reconnaissance of the Colombian Amazon: 54th meeting, European Association of Exploration Geophysicists, Expanded Abstracts, p. 428–499.</ref> This study area was very large approximately 300,000 km<sup>2</sup> (115,000 mi<sup>2</sup>) and remote with dense jungle cover, rugged terrain, and limited road access.
    
The first phase of the program consisted of 31,700 km (19,700 mi) of [[Gravity basics|airborne gravity]] and [[magnetics]]. The large-scale structures delineated in these surveys were then further investigated by [[magnetotellurics]] (MT). The MT survey was feasible with a light helicopter because the crew was small and equipment was light and compact. Data were collected from 43 sites, with a typical spacing of 10–20 km (6–12 mi).
 
The first phase of the program consisted of 31,700 km (19,700 mi) of [[Gravity basics|airborne gravity]] and [[magnetics]]. The large-scale structures delineated in these surveys were then further investigated by [[magnetotellurics]] (MT). The MT survey was feasible with a light helicopter because the crew was small and equipment was light and compact. Data were collected from 43 sites, with a typical spacing of 10–20 km (6–12 mi).
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* 40–100 ohmm (sedimentary)
 
* 40–100 ohmm (sedimentary)
 
* 150–250 ohmm (sedimentary)
 
* 150–250 ohmm (sedimentary)
* >1000 ohmm (crystalline basement)
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* >1000 ohmm (crystalline [[basement]])
    
[[:file:applying-magnetotellurics_fig16-5.png|Figure 1]] shows a simulated [[cross section]] in the Amazon basin based on MT data.
 
[[:file:applying-magnetotellurics_fig16-5.png|Figure 1]] shows a simulated [[cross section]] in the Amazon basin based on MT data.
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Encouraged by the evidence from the MT survey, Amoco decided to shoot a small seismic program and drill a shallow stratigraphic test. This program was positioned on the edge of a subbasin defined in the MT data. There generally was good agreement between the MT data, the seismic data, and the borehole geology.
 
Encouraged by the evidence from the MT survey, Amoco decided to shoot a small seismic program and drill a shallow stratigraphic test. This program was positioned on the edge of a subbasin defined in the MT data. There generally was good agreement between the MT data, the seismic data, and the borehole geology.
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The airborne gravity and magnetic data, followed by the surface MT survey, provided a very cost-effective means of regional basin definition and led directly to a well-positioned seismic survey and well site.
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The airborne [[gravity]] and magnetic data, followed by the surface MT survey, provided a very cost-effective means of regional basin definition and led directly to a well-positioned seismic survey and well site.
    
==See also==
 
==See also==
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[[Category:Predicting the occurrence of oil and gas traps]]  
 
[[Category:Predicting the occurrence of oil and gas traps]]  
 
[[Category:Applying magnetotellurics]]
 
[[Category:Applying magnetotellurics]]
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[[Category:Treatise Handbook 3]]

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