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A gravimetric prospecting can detect gravity anomalies which take us to determine density differences in the field. For instance, a lack of gravity (low density) may be due to salt domes and hydrocarbures, while an excess of gravity (high density) may be due to a highly mineralized body.

Global gravity and gravity deviation with respect to the background.

GRAVIMETRY

Objective: to get information about the different densities of the rocks that build up the cortex. If it is complemented to the geological knowledge of the zone, the kind of the rock can be unequivocally determined.

TYPICAL GRAVIMETRY RAISING

A) Field Phase
To define a mesh and in every node to measure the acceleration of the gravity.

B) Corrections
* Drift of the instrument: the gravimeter is not perfect. A reference station is used in order to quantify the movement of zero (how zero changes in the instrument during the time (it is assumed linear))
* Topographic correction: a hill increases the acceleration of gravity while a bowl makes it slower. All the data must be taken to flat topography.

C) Final map: isoanomalous of gravity.
The map gotten shows the variations caused by the acceleration of gravity as the exclusive result of the different densities of the rocks: while higher is the density, denser the rocks will be. It can be very convenient to make a statistical analysis of the gravity and show the deviations in relation to the background (residual gravity)