Borehole Resistivity and Self Potential Logging System

The Borehole Resistivity Logging System is a rugged, portable, hand-operated downhole logger which measures both apparent resistivity and the natural self-potential (SP).

Applications include mineral exploration, subsurface mapping (isopachs), locating fresh and salt-water bearing information; lithologic and structural correlation between wells, and well construction.

Features

• Measures both resistivity and self-potential (SP)
• Resistivity is read in a range of 0-10,000 ohm-feet
• Self-potential is read in a range of 1-1,000millivolts, positive or negative
• Battery powered readout instrument, and indicator for resistivity and SP in a rugged water tight case
• 500 feet of four-conductor downhole logging cable mounted on a portable hand reel
• 1" diameter probe assembly
• Two single-conductor insulated surface lines on storage reels

Technical Specification

Instrument

• Current: 9 milliamps
• Resistivity: DC, null-reading meter; 0-10,000 ohm-feet
  readable within ±0.10% full scale
• Self Potential: Range 0-1,000 millivolts, positive or negative
• Batteries: Six 9-volt transistor batteries; one C-cell battery
• Dimensions: 7" x 16" x 12"
• Weight: 13 lbs

Cable

• Surface: Type Two single conductor insulated wires with connectors on cable storage reel
• Dimensions: 50 feet long (each)
• Net Weight: 2.5 lbs.
• Downhole Type: 4-conductor, ¼" diameter, 500' length

Reel

• Construction Powder coated steel
• Dimensions 13" x 12" x 15"
• Weight 30 lbs

Probe Assembly

• Type One 1" diameter current electrode and three
• potential electrodesmounted on 15 feet of cable
• with waterproof in-line connector for attaching
• to logging cable
• Weight 1.5 lbs.
• SystemWeight 47 lbs

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