Well distributionIn the pre-drilling campaign at the AT1 site, one production well (AT1-P) and two monitoring wells (AT1-MC and MT1) were drilled between February and March 2012. These were followed by one coring well (AT1-C) drilled between June and July 2012 (Fig. 5).Figure 5shows the well distribution in a plan view.Figure 5aisa bathymetric map around the AT1 andb1 sites andFigure 5bisan enlargedfigure around AT1 (2012). As the geologic formation dips toward the northwest by approximately 20 , the production well(AT1-P) was located slightly down dip from the monitoring wells (AT1-MC and AT1-MT1). Therefore, the same geologic formation in AT1-P will appear approximately 5e7 m deeper than in the monitoring wells. We attempted to locate the production well at the midpoint between the two monitoring wells; however,because of technical reasons, this was not achieved (Yamamoto et al., 2015).The coring well was drilled at approximately 32 m northeast from the location of the AT1-MC well. As the AT1-MC well was inclined to the northeast, the actual distance between the two wells in the reservoir (MHCZ) section was approximately 20 m. The differences in depth between the two wells for the same sand layers were less than 1 m (Suzuki et al., 2015) because they were almost along the strike line.
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