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Gravity measurements

Gravimetric plots show a correlation between the oil and gas fields and the flanks of the high gravity areas. Note that the high resolution differential gravity measuring gradiometer instrument was developed by BHP Billiton of Australia and Lockheed.

- from www.sgl.com  Sander Geophysical

see gravity meter

see gravity gradiometer

Comparing gravity as measured on the ground and as measured in the air

From www.sgl.com  Sander Geophysical.

Above can be seen a very good correlation between gravity measurements taken on the ground and in an aeroplane.

From www.sgl.com  Sander Geophysical.

From the plot below showing the correlation between the ground water level and the variation in gravitational field strength, one concludes that a regular monitoring of the gravitational field strength over time should be enable one to monitor the depletion of an oil reservoir, and furthermore, that a monitoring of the changes in the spatial gravitational field might be able to indicate the spatial depletion of the oil reservior.

The classical treatment of gravity data. Top: groundwater level at Metsähovi from 1 December 1994 to 31 December 2005. Bottom: Gravity residuals with fitted groundwater level. The regression coefficient varies from 25 to 28 nms^-2 depending on the correction of the Baltic Sea. Correlation coefficient is 0.83.

From " Comparison of superconducting gravimeter observations with hydrological models of various spatial extents"

H. Virtanen, M. Tervo, M. Bilker-Koivula,

Finnish Geodetic Institute

P.O.Box 15, FIN-02431 Masala, Finland

heikki.virtanen@fgi.fi

- from http://www.astro.oma.be/ICET/bim/bim142/Comparison

additional text © Barnard Microsystems Limited 2006 - 2008