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LEDUC (D-3) ATTIC OIL DRILLING
LEDUC (D-3) ATTIC OIL DRILLING SUMMARY
Modern seismic interpretation is one of the key tools to identifying unswept accumulations of light oil in the 60 year old field. Reprocessed data from a 3-D seismic survey shot in 1998 reveals in detail varying structural relief over the surface of the Leduc reef complex and irregularities along the reef margins such as promontories and re-entrants. Topographic features, such as “raised rims”, localized final reef stages and relief caused by differential compaction of muddy reef interior sediments have been shown, through development activities, to contain un-drained “attic” oil reserves. Two Leduc wells drilled in 1998, on the basis of the seismic (and less refined interpretation), at 03/06-06-049-26W4 and 02/12-28-050-26W4 have produced 75,000 and 55,000 barrels to date, respectively. The well at 03/06-06 is still producing 68 bbl/d of oil.
Current Leduc infill drilling locations have been chosen on the basis of several attributes including; seismically defined structural relief compared to adjacent wells, area of structural closure, historical production performance of offset wells and the structural elevation of the final completed interval of offset wells.
A recent well drilled at 01-36-049-26W4 was proposed on a 3-D defined high with closure of approximately 42 acres. The Leduc Formation came in higher than prognosis, resulting in an 8 m oil column within the structural closure. The well has been on production since March 11 and is currently producing ~190 bbl/d of oil. Initial oil rates were up to 300 bbl/d. The well was assigned 2P reserves totaling 191.1 Mbbl of oil, 86.0 MMcf of gas and 2.6 Mbbl of natural gas liquids in the recent Sproule report. A second recent Leduc well was drilled at 10-06-050-26W4. The well is currently waiting on completion, equipping and tie-in.
A total of 15 drilling locations targeting structural features have been identified, 11 of which have been assigned 2P reserves. Individual well reserve assignments range from 27 to 109 Mboe. The forecast start rates of new drills ranges from 25 to 50 bbl/d, arguably conservative given the recent results at 01-36. Three of the additional proposed wells were modeled internally using median assumptions from the engineering report. The two remaining potential locations were not modeled due to smaller interpreted areas of closure. Several examples of 3-D defined locations, both with assigned and unbooked reserves, are shown on converted 3-D depth structure maps on the opposite page.
