Stanford VI-E_Paper.pdf explains the details of Stanford VI-E data. If you use the data, reference the paper as follows:
'Lee, J. and Mukerji, T., 2012, "The Stanford VI-E reservoir: A synthetic data set for joint seismic-EM time-lapse monitoring algorithms": 25th Annual Report, Stanford Center for Reservoir Forecasting, Stanford University, Stanford, CA.'
The data are text files formatted by GSLIB conventions. The following link will help you understand the GSLIB format:
http://scrf.stanford.edu/resources.software.gslib.help.02.php