2000 SEG Annual Meeting,
2000. Society of Exploration Geophysicists
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When gas is exchanged with water or oil during pumping from a hydrocarbon reservoir, the mass change may cause a measurable change in surface gravity. Extracting gas from fields with active acquifers, and from those in which gas injection is employed to control fluid flow, may cause gravity changes of more than 10 microGal/year, depending on volume of change, porosity, saturation change, etc. Corresponding changes in the gravity gradient may be of the order 0.02 - 0.1 E/year.
Gravity monitoring has previously been used to observe water level changes in onshore hydrothermal reservoirs (Allis and Hunt 1986, San Andres and Pedersen 1993) and changes in volcanic magma chambers (e.g. Rymer and Brown 1986).
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