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Gravity offers significant applications to petroleum exploration. Gravity measurements are affected by changes in rock [[density]]. Surface gravity surveys and subsurface surveys made with a [[borehole gravity]] meter are effective in locating [[fault]]s and geologic structures with density contrasts to their surroundings. The borehole gravity meter has broad application, from locating [[porosity]] in wildcats or through [[casing]] in old wells to monitoring fluid changes in productive [[reservoir]]s.  

Gravity offers significant applications to petroleum exploration. Gravity measurements are affected by changes in rock [[density]]. Surface gravity surveys and subsurface surveys made with a [[borehole gravity]] meter are effective in locating [[fault]]s and geologic structures with density contrasts to their surroundings. The borehole gravity meter has broad application, from locating [[porosity]] in wildcats or through [[casing]] in old wells to monitoring fluid changes in productive [[reservoir]]s.  

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