Field test of CO2 injection in Nagaoka, Japan

Publisher Summary This chapter demonstrates that the use of cross-well seismic tomography in an onshore aquifer. Results of seismic survey suggested that the injected CO 2 may migrate preferentially along the formation direction. The geophysical loggings of induction and sonic showed the CO 2 accession to the observation well CO 2 -2. The pore pressure buildup measured at the observation well CO 2 -4 was about 6 % caused by the CO 2 injection. It is interesting to note that there was not any significant change in S-wave velocity at the observation well CO 2 -2. Such results may enable us to predict quantitatively the location and amount of CO 2 in the cross-well image plane. A series of observations and measurements composed of cross-well seismic tomography, geophysical logging, pressure and temperature measurement, and seismicity monitoring have been conducted at the test site to understand the CO 2 behavior in the underground aquifer.