We present results from a transient electromagnetic experiment to detect hydrocarbons and to monitor their movement within a reservoir. The method is illustrated with data obtained from multichannel transient electromagnetic (MTEM) surveys.

In the petroleum industry, seismic reflection is used extensively to determine subsurface structure, and to locate potential reservoirs, but it is usually unable to determine the nature of the fluid content in the rocks. Because we wish to avoid drilling dry holes, it is obviously very important to know before drilling whether a reservoir contains hydrocarbons or not.

EM methods have the potential to reduce the risk of...

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