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The object in drilling well F-15 was to follow along the underside of the structure bounding fault (Fault-E), staying within the footwall. Shortly after entering the A-2 sand, the well floated and crossed Fault-E, into the hanging wall, repeating the E7 through A2 sands. The operator correctly picked the fault intercept, but interpreted the fault to be antithetic to the bounding fault (i.e., similar to Fault M) and correlated the sands below the fault to the deeper A-4 through A-7 sands. This structural interpretation caused complications with other wells along strike, which had pay in the sands below A-2. Careful correlation of the F-15 well logs to themselves and to those of other wells along strike revealed the correct interpretation (above). |
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