Exploration Well Teboursouk 1 (“TEB1”): CTF – Rig 06 has reached the total depth at 2,545m after penetrating a substantial thickness of siltstones and compact sandstones levels with intercalations of marls and shales in the primary target, the Lower Aptian M’Charga formation. Gas shows of about 0.2 % have been recorded
associated with poor cut fluorescence and presence of bitumen.
Whilst drilling the Carbonate Complex Formation (originally the secondary target), dark limestones (Bahloul Formation) which are possibly oil bearing were encountered at approximately 1,000 metres depth. Within this formation the image logs have highlighted the presence of a 5 metre section with high porosity associated with a very large fracture system and with the presence of fair to good cut fluorescence. The gas reading decreased strongly and sharply. This may be interpreted as a good sign for a permeable zone where hydrocarbons are swept into the geological formation.
The revised work programme is now designed to run a full set of logs on the Lower Aptian M’Charga formation (originally the primary target) and to complete the evaluation of the well results. A drill stem test (“DST”) will also be executed in the Carbonate Complex formation at about 1000m.
The results of the DST test are expected in 2 weeks time.
Once the test results are available an overall preliminary reinterpretation of the prospect will be conducted. At that point the operator, in consultation with the partners, will be able to determine the outcome of the well and whether:
1. the well should be completed as a producer;
2. a sidetrack should be drilled;
3. the well should be suspended and the rig demobilised whilst detailed analysis is undertaken and the results incorporated into the prospect model; or
4. the well should be plugged and abandoned.
