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Case History:

Central Scotland, coal bed methane

  • Working with BG Group to develop a reliable coal bed methane exploration and appraisal survey tool based on Adrok’s technology
  • Survey Area located onshore United Kingdom
  • Adrok trained on 4 drilled well locations (for coal signatures and for sedimentary rock & Igneous rock layer signatures)
  • Surface terrain comprised low lying farmland. Survey sites on pads.
  • Carboniferous marine sequences
  • BG Group is interested in dielectrics as a new measurement to help their subsurface interpretations for tracking coal beds
  • The results of the Adrok survey were compared to the actual drilling results (Adrok presented results before drilling commenced).
  • Adrok produced Virtual borehole log charts
  • No HSE accidents

Blind Test – Limestone Coals

Calibration Well - Black Metal Shales

Blind Test Well

BG Group’s Conclusions – Dielectric Profiles at Well-sites

  • What is being measured?
    • Adrok Dielectric responses
      • Coal has low dielectric < 3
      • Water has high dielectric 80-81
      • Calcite has high dielectric 8
  • Depth control
    • seems good +/- 10 feet
  • Coal beds
    • prediction is possible but not reliable
    • high dielectric – water filled?
    • low dielectric- tight? gassy?
  • Sand beds
    • low dielectric – sands with hydrocarbon?
    • high dielectric- calcite cemented?
  • Volcanics
    • High dielectric suggesting its presence at a particular depth
  • Shale Gas beds
    • Low dielectric suggests there is organic material in the Black Metal Shales

Way Forward in Coal Bed Methane

  • What benefit does the Adrok tool provide to coal bed methane exploration?
    • Answer:
      • Track coal beds
      • Maps water content
      • Accurate depth control +/- 10feet matching to boreholes
  • Next stage is to use ADR’s spectral analysis to ascertain coal quality & improve reliability
    • “good” coals versus wet coals