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Line 15: + + − − [[file:applying-gravity-in-petroleum-exploration_fig15-10.png|thumb|{{figure number|1}}]] − − [[file:applying-gravity-in-petroleum-exploration_fig15-11.png|thumb|{{figure number|2}}After .<ref name=ch15r9>McCulloh, T., H., Kandle, J., R., Schoellhamer, J., E., 1968, Application of gravity measurements in wells to problems of reservoir evaluation: Transactions of the 9th Annual SPWLA Logging Symposium. Fundamental work describing the distance of sources seen by the borehole gravity meter.</ref> Copyright: SPWLA.]]
→How the tool measures gravity
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==How the tool measures gravity==
==How the tool measures gravity==
[[file:applying-gravity-in-petroleum-exploration_fig15-10.png|300px|thumb|{{figure number|1}}Fundamentals of measuring density using a borehole gravity sensor.]]
[[:file:applying-gravity-in-petroleum-exploration_fig15-10.png|Figure 1]] illustrates the fundamentals of measuring density using a [[borehole gravity]] sensor. Two gravity measurements, ''g''<sub>1</sub> and ''g''<sub>2</sub>, are made downhole, separated in depth by Δ''z''. The value ''G'' is the universal gravity constant. Thus, the gravity gradient, Δ''g''/Δ''z'', is related directly to the density of the intervening layer. The result is a direct computation of the bulk density of that layer.
[[:file:applying-gravity-in-petroleum-exploration_fig15-10.png|Figure 1]] illustrates the fundamentals of measuring density using a [[borehole gravity]] sensor. Two gravity measurements, ''g''<sub>1</sub> and ''g''<sub>2</sub>, are made downhole, separated in depth by Δ''z''. The value ''G'' is the universal gravity constant. Thus, the gravity gradient, Δ''g''/Δ''z'', is related directly to the density of the intervening layer. The result is a direct computation of the bulk density of that layer.
==Depth of investigation==
==Depth of investigation==