Abstract

This chapter gives a striking account of the success rate in the Murzuq Basin, Libya. The first exploratory well in Libya was drilled on the Qasr al Ahrar anticline in the Jabal al Akhdar in 1956. Since then 77 exploratory wells have been drilled in Cyrenaica, and the results have been disappointing. In spite of several shows, the only significant success has been in the Ash Shulaydimah Trough where several discoveries have been made in Palaeocene and Eocene reservoirs at Antlat, and in wells Al, Bl and Cl-NC 129. These oils, as discussed in, are hybrid oils derived from Cretaceous, Palaeocene and Eocene source rocks. Excluding the Ash Shulaydimah Trough and the offshore area, no effective petroleum system has yet been established in Cyrenaica despite the presence of numerous shows. This is probably due to a combination of factors, including questionable source rocks and ineffective seals. On the Cyrenaica Platform shales within the Devonian represent late mature potential gas-prone source rocks, and at least one well, on the western margin of the Cyrenaica Platform encountered oil shows within the Tanzuft Formation.

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