What is an intact sedimentary cover?

Reasons not to be intact: This is the sedimentary cover:
  • Fractures
     
  • Drilled wells
     
  • Pipes / gas chimneys
     
  • Glacifluvial channels
     
     
Remark: With the HiSAS we can only detect irregularities of the sediment cover in the top few centimetres. Everything that is deeper (like pipes and channels), needs to be investigated by using seismic methods!