MT world-wide. MT - Definition. Passive surface measurement of the earth's natural electrical (E) and magnetic (H) fields Measure changes in E and H w/timeFrequency range 10kHz to .001 HzUsed to derive the resistivity structure of the subsurface. MT - History. First used for academic and geothermalMap plate boundaries, alteration, etc.Use for petroleum starting ~19801980's: many in-house groupsShell, Amoco, Sohio, Arco, CGG1990's: most work outsourced to contractors and consultant197
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