The majority of Tunisias Oil production (73 percent) comes from six concessions, which include Adam, Ashtart, Didon, El Borma, Miskar and Oued Zar. The remaining production comes from 26 smaller concessions. In 2005, Adam field, located in the Borj el Khadra prospect in Ghadames basin, became Tunisias largest producing oilfield at 18,000 bbl/d. The Borj el Khadra prospect is operated by Agip, with partners Pioneer Natural Resources, Paldin Resources and ETAP. The onshore El Borma oilfield, which Agip discovered in 1964 near the Algerian border, produces around 12,000 bbl/d. This production level is down from the 1985 peak of 70,000 bbl/d. Ashtart field, which is operated by ETAP, produces around 11,500 bbl/d.
In addition to Tunisias producing oil fields, foreign and domestic operators are continuing to explore and develop new hydrocarbon discoveries in the country. A partnership between a Tunisian and a Kuwaiti oil firm is drilling an offshore Well with expected reserves of 6 million barrels of oil. Swedens PA Resources (PAR) is involved in development and exploration in the Douleb field, the Zarat concession and the Tamesmida field and Swedens Lundin Petroleum operates a number of offshore fields - notably, the Isis and Oudna fields. In February 2004, Tunisian independent HBS Oil Company announced an oil discovery on Djerba Island. Petroceltic announced in December 2004 that it had struck both oil and gas at its Sidi Toui 3 well in the Ksar Hadada Block in southern Tunisia. In April 2005, the U.A.E.s Mabdallah Saad al-Thani Corporation announced a five-year exploration agreement with ETAP for the El Jem block, while U.S.-based Rigo Oil Company announced an exploration agreement for the Tozeur-Sud block. In February 2006, Tunisia awarded Petro Canada and Anadarko 2-year, production sharing agreements (PSAs) with ETAP for the Cape Sirat and Bashtar blocks.
In February 2006, a 35-year-old oil exploration dispute between Tunisia and Malta came to a close. The two countries signed an agreement that provides for joint oil development of the continental shelf between Malta and Tunisia. The ministers who signed the agreement are hopeful of finding oil in the continental shelf area, which is located near the Tunisian Isis field and Libyas offshore Bouari field.