Changes

At first, consist in the indirect searching of the resources using geophysics methods: Magnetic survey or register, gravimetric survey and seismic survey.

At first, consist in the indirect searching of the resources using geophysics methods: Magnetic survey or register, gravimetric survey and seismic survey.

=== Magnetic survey or register ===

=== Magnetic survey or register ===

Consist in the register of the magnetic fields of the rocks, having the Earth magnetic field as reference. These fields are register by a magnetometer installed in a plane that flies over the interest zone. The sedimentaries formation that presents hydrocarbons doesn’t manifests magnetics properties.

Consist in the register of the magnetic fields of the rocks, having the Earth magnetic field as reference. These fields are register by a magnetometer installed in a plane that flies over the interest zone. The sedimentaries formation that presents hydrocarbons doesn’t manifests [[magnetics]] properties.

=== Gravimetric survey ===

=== Gravimetric survey ===

Registers the variation of the rocks density, taking as reference the Earth gravitational field (Figure 1).

Registers the variation of the rocks density, taking as reference the Earth gravitational field (Figure 1).