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Current density and distribution, magnetic field sensitivities, and magnetic field amplitudes have been analyzed for a Bzz and coplanar Bxx transmitterreceiver configuration. Interpretation of the results indicates that borehole TEM is sensitive to a resistive CO 2 injection into a conductive layer. Introduction This project has been designed to evaluate the use of transient electromagnetics (TEM) as a means of monitoring carbon dioxide (CO 2) sequestration. Injection of CO 2 into reservoirs has been used for years as an enhanced oil recovery method, though recently, interest has developed into using CO 2 sequestration as a way to reduce greenhouse gas emissions into the environment. To monitor how the sequestered carbon dioxide will flow in the subsurface, remote geophysical methods such as TEM must be employed. As this project is in preliminary stages and no down-hole 3D TEM tool has been constructed, the focus has been on numerically modeling the TEM responses. This modeling has been performed using a three-dimensional finite difference time domain (3DFDTD) algorithm similar to that developed by Wang and Hohmann (1993). TEM responses have been evaluated for a simulated CO 2 flood in the Maljamar Field, Lee County, New Mexico.