The Effect of Conduction on VHF Radar Images Shot in Water-Filled Boreholes
作者： I.M. Mason , A.J. Bray , T.G. Sindle , C.M. Simmat , J.H. Cloete
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摘要: A downhole digital memory-logging pulsed borehole radar transceiver operating in the 10-125-MHz band was run repeatedly down two 1.25-km-deep, uncased, water-filled 60-mm boreholes Northern Limb of Bushveld Complex, South Africa. Suspended on an insulating cord, it mapped a steep fault Main Zone from range 75 m through its intersection with borehole. Lowered wire rope, launched guided ~75 m/mus first-order transverse magnetic pulses which shuttled axially between and bedding planes. Decoupled by 2 yielded profile reflections plane echoes superimposed. As descended mineralized, stratified Platreef, traces were found to be imprinted voltage level shifts that showed, Laterolog-comparable resolution, conductivity Platreef.
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