RE:RE:NewsThis is from an article I found on the web.
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RECENT ABIOD DISCOVERIES
Explorationists and production engineers began to take a fresh look at the Abiod as a potential reservoir and to upgrade it from a secondary to primary target following the discovery and testing of the 1 Maamoura Est well by AGIP in 1988.
The well flowed 3,300 b/d of oil from fractured Abiod close to the top of the reservoir section. The oil was of excellent quality at 41 gravity, but the reservoir was poor, having a high clay content and a primary porosity of about 8%.
Potential reserves are reportedly about 50 million bbl.
The difficulties of producing from fractured reservoirs are well known, and the application of horizontal drilling technology for the first time in Tunisia is being investigated as a means to prevent early water breakthrough and improve economic potential.
At the end of 1988, Kufpec spudded a well at Sidi el Kilani about 70 km south of Maamoura to test the potential of a common primary objective, the Turonian carbonates at about 2,800 m.
No hydrocarbon shows were observed while drilling through Abiod, but sidewall cores were taken and found to contain oil. Later examination of electric logs confirmed the presence of hydrocarbons.
Good oil and gas shows were found in the primary target, but subsequent tests were not productive. However, on a final test of Abiod after acidizing, the well flowed at a stabilized rate of 3,300 b/d of 400 gravity oil.
A long term test was conducted for 30 days at 1,500 b/d and a surface pressure of about 600 psi. Petrophysical measurements on the sidewall core samples showed the chalk to be cleaner than that at Maamoura with no clay minerals present. Calculated porosity was substantially higher at 24% on trend with the expected porosity of chalk at a present depth of burial of 1,600 m.