Karakilise production lease is situated about 30 km North of Diyarbakır. Karakilise-1 exploration well was spudded in June 2003 and drilling operations were completed at a depth of 2,472m in Mardin Group carbonates (Karababa-C) with a 31 API oil discovery. The well was put on production with 380 bopd initial rate in September 2003.

The Mardin Group carbonates are extensively explored as the main reservoir unit in the SE Anatolian Basin. In general, dolomitic wackestones of Karababa-C member of the Karababa Formation and dolomites of the Derdere Formation are the main reservoir intervals. Dolomitic units of the Mardin Group may exceed 20% matrix porosity and 10md permeability in the Diyarbakır area. Natural open fractures also significantly increase the well productivity; however, the degree of fracturing and their orientations are closely related to both the regional stress regimes. Overlying Sayındere and Kastel formations form effective seals over Mardin carbonates.

After the oil discovery in Karakilise-1 (2003), Karakilise-2 was drilled as step-out appraisal well to same reservoir in November 2004 and completed as dry hole with oil shows at 2,525 m in Mardin carbonates.

In September 2006, Karakilise-1 was deepened to the Bedinan sandstones (B4) to prove for any commercial oil accumulation. The well was re-completed in Mardin reservoir within the same year after an unsuccessful test in Bedinan sandstones.

Hakan Yılmaz-1 was drilled to 2,502m, 1.7 km South of Karakilise-1R over a separate Mardin closure. Even though oil-cut drilling muds were recovered from both DSTs (#2 and #3), the well couldn’t be completed for technical reasons and P&A’ed in July 2008. The JV partners has been re-evaluating this large Mardin closure with the existing 2D seismic data.

New 24km 2D seismic program is also planned over Karaklise and Hakan Yılmaz closures to remap those structures for drilling a new well over one of the prospective areas in 2023.

Karakilise field is on trend with the other Mardin fields, i.e., Petek and Bostanpınar, where similar Mardin plays have been explored and produced from the same reservoir intervals.