What we do:

Measurement of gravity variation is an important part of any oil or mineral exploration activity. In recent years, advances in steering technology for drill bits rely on drill head gyro systems to provide accurate positional information, especially for slant or horizontal drill paths. Gravity data is needed to calibrate and correctly interpret data from these gyro systems.

Measurement of gravity, especially from aircraft, is a complex and difficult task. Turbulence, end-of-line turns, aircraft attitude, height variation all contribute to the difficulties. Current gravimeters and gravity gradiometers are complex, bulky systems (typically 200 – 450kg in weight) and must be mounted on complex inertial platforms to minimise the effects of aircraft motion. Gravity measurements can be obtained using satellite altimetry, albeit low resolution, and most seismic boats also record low resolution gravity data using mass-spring-damper gravimeters.

Exact Group has designed a new, compact airborne gravity gradiometer. The Gravex system will allow very accurate measurements of both absolute gravity and the gravity gradient to be made with a high spatial resolution. Using Gravex in conjunction with Seepfinder and aeromagnetic systems, Oilsearch surveys provide the first real indication of oil before the drill bit in frontier offshore exploration, saving millions of dollars from an exploration budget.

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In detail:

• Services
  
• Gravity surveys
• Seepfinder

For further details contact Oilsearch.