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Line 50: + + − The figure below is a schematic of the earth, showing its gravity field (left) and magnetic field (right). The gravity field always points downward; thus, the measurements can be scalar. In contrast, the magnetic field can point in any direction; therefore, vector information is more important in interpreting magnetics.+ − − [[file:applying-gravity-in-petroleum-exploration_fig15-1.png|thumb|{{figure number|15-1}}]]
→Gravity vs. magnetics
==Theory==
==Theory==
Gravity effects caused by subsurface geology are superimposed upon the earth's overall gravity field. These effects, called anomalies, are typically less than 100 ppm of the total field. Several corrections are made to remove the earth's field from the total measurement to image these anomalies. For petroleum exploration, gravity is measured in milligals (mGal). Typical exploration anomalies are generally
Gravity effects caused by subsurface geology are superimposed upon the earth's overall gravity field. These effects, called anomalies, are typically less than 100 ppm of the total field. Several corrections are made to remove the earth's field from the total measurement to image these anomalies. For petroleum exploration, gravity is measured in milligals (mGal). Typical exploration anomalies are generally
[[file:applying-gravity-in-petroleum-exploration_fig15-1.png|thumb|{{figure number|1}}]]
==Gravity vs. magnetics==
==Gravity vs. magnetics==
[[:file:applying-gravity-in-petroleum-exploration_fig15-1.png|Figure 1]] is a schematic of the earth, showing its gravity field (left) and magnetic field (right). The gravity field always points downward; thus, the measurements can be scalar. In contrast, the magnetic field can point in any direction; therefore, vector information is more important in interpreting magnetics.
==Acquisition and instrumentation==
==Acquisition and instrumentation==