Quad’s gravity and subsidence sensors and surveys supersede any others in terms of resolution, reliability and cost. It compares favorably to both cost and resolution figures of other technologies, such as well interventions or 4D seismic surveys. Further, Quad has 20 years of experience in conducting these surveys.
Quad Geometrics’ gravity and subsidence surveys of natural gas reservoirs have been helping control production, improve the precision of remaining reserve estimates and drilling decisions and aiding in CO2 sequestration for over a decade.
Repeat surveys in the North Sea have achieved vertical resolution down to ½ meter in the gas-water contact height, and seafloor subsidence of 2-5 mm precision. The technologies being incorporated by Quad have been tested to depths of 3000 m, indicating they are highly robust and capable of providing great clarity into subsidence and density changes in deep water environments.
Quad personnel are experienced in using ambient seawater pressure measurements to detect seafloor subsidence with a resolution comparable to or better than that obtained with GPS on land.
For long-term, continuous pressure recordings for subsidence monitoring, Quad can provide a self-calibrating pressure recorder to compensate for pressure gauge drift and reveal, slow, steady subsidence associated with oil or gas extraction.