Demco NV

Rheocable

• Aquares provides not only quantitative information (depths and thicknesses) but also qualitative information, distinguishing different sediment and rock types
  

• flexibility: Aquares can operate successfully:

1. in shallow as well as in deep water:
   Whereas seismic reflection methods suffer from "multiple reflections" in shallow water, Aquares works perfectly in shallow water. As long as the cable is wet the system functions, even in a shallow ditch. The picture shows a diamond exploration resistivity survey along a beach in the Noordkaap, South-Africa.
   
   
   
2. in gravel:
            
   
   Gravel is known to cause diffractions on seismic records obscuring seismic results while Aquares resistivity measurements do not suffer any negative effects at all and are perfectly capable of determining even the base of the gravel deposits. This makes the Aquares resistivity methods very attractive to alluvial gold and diamond mining exploration applications. The example shows a horizontal resistivity section at 2 m below river bed level showing diamondiferous gravel on the Sankuru river in DRC Congo.
   
   
   
3. caprock:
   
   Cemented layers at the seabed surface completely block all seismic energy while electrical currents injected by the Aquares resistivity method easily find their way even through thicker cap rock. For this reason Aquares is the preferred geophysical method for sand searches, pipe route surveys and other geological exploration campaigns in areas with common cap rock occurrences such as the Persian Gulf or West-Australia.
   
   
   
4. without "gas masking" problems:
           
   
   Gas bubbles generated by rotting vegetation in organic rich sediments generate diffractions on the seismic response significantly limiting seismic penetration. As the Aquares resistivity method is not affected by these bubbles, it tends to be successful even in mangrove swamps and other types of organic rich sediments. The example shows the results from a combined resistivity-boomer survey in Luderitz, Namibia where the resistivity results clearly show bedrock levels where the boomer fails due to gas masking effects in diatomaceous silt.
   
   
   
5. without geological limitations such as velocity inversions:
   
   Refraction seismic methods are notoriously inaccurate in general and require conditions involving a strict sequence of geological layers with acoustic velocities continuously increasing with depth. Velocity inversions involving high velocity structures on top of low velocity structures generate erroneous refraction results. Due to the nature of resistivity methods velocity inversion situations are easily and correctly handled by the Aquares method. The example shows a resistivity and refraction example from Flinders Port, South-Australia where the refraction results failed to detect a high velocity cemented shell bed at the seabed surface, while boreholes perfectly confirmed the resistivity results.
   
   
   
6. in high noise environments such as surf zones and heavy weather conditions:
   
   Whereas seismic results are drowned in noise generated by high energy environments such as surf zones, the seabed towed cables used by the Aquares method are far less affected by rough sea conditions. This makes Aquares very attractive for applications such as pipe route landfalls and diamond exploration in coastal areas.
   
   
   

• Thanks to it's flexibility Aquares works fast and therefore tends to be cheaper
  
• Aquares is more accurate as compared to seismics
  
• Aquares provides high precision georeferenced 4D models (GIS) of the survey area with presentations in vertical as well as horizontal sections. The next video illustrates the possibilities of Aquares 4D presentations