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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