Continuous Gravity Measurement for Practical Monitoring

Abstract

Examining the possibility of sequestering CO2 gas in shallow aquifers (horizontal permeable aquifer extends from 400 to 900 meters depth) continuous gravity measurement is promising tool for monitoring. The calculated microgravity disturbance is expected to be smaller at the earth surface for the deeper cases, however, can be detectable using a superconducting gravimeter. A new superconducting gravimeter model has been simplified for portable and field operation, but retains the stability and precision of previous superconducting gravimeters. A new type of metal spring sensor gravity meter is another choice. It also has a large dynamic range and enough sensitivity to record the continuous background seismic and earth tide activity. We made preliminary continuous recording with the gravimeter at a geothermal field and confirmed the performance of the gravimeters and detected particular signals.