Terraquest Gravity Acquisition

Terraquest Gravity Acquisition

Since 2009 Terraquest has performed over 216,000 line kilometres on 15 surveys around the world in a wide variety of environments including central and southern USA, South America, central Africa, Middle East and offshore North Atlantic. The GT2A total field gravimeter by Canadian Microgravity was used on most of these surveys, flown either in a Navajo for cost effective terrestrial surveys or turbine twin engine King Air for the more demanding offshore and high altitude surveys.

Gravity Surveying:

The world’s gravity field varies from location to location due to elevation, latitude, and subsurface density variations. Gravity data are used to model these variations to determine the depth, size and shape of deep, subsurface gravitational anomalies, which can potentially be associated with economic deposits, primarily oil and gas resources. Airborne gravity is the process of measuring and mapping these changes in the gravity field using an airborne gravimeter on a stable, fixed wing aircraft. Having operated three types of gravimeters and based on superior performance, Terraquest has chosen the Canadian Microgravity GT2A system, ensuring that we are constantly using the latest technological upgrades available.

Advantages of the GT2A gravimeter include:

  • More precise measurements
  • Reliable performance in high turbulence
  • High productivity
  • Aircraft- independent operations
  • Fully automated recording
  • In-field Quality Control
  • In-field production of preliminary free-air gravity map

Terraquest_Gravity_Acquisition_01

Airborne Gravity Survey Specifications:

  • Superior gravity data is acquired when the aircraft flies in less turbulent conditions, often at night.
  • Gravity systems cannot operate well in wind conditions above 15 knot, or on more than a 20 degree bank of the aircraft.
  • Terraquest utilizes both the King Air C90 and the Piper Navajo aircraft which provide very stable platforms at relatively slow rate of speed, typically 220-240 km/h.
  • Gravity surveys are typically flown at ~300m elevation and with line spacing greater than 500m.
  • Gravity surveys can be flown in combination with magnetics and occasionally radiometric instruments.
  • Airborne gravity provides an economical alternative to ground gravity technology and therefore an excellent starting point for your exploration program.

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