Sonatrach is associated with six foreign companies insofar as the deposit overlaps three blocks.
On block 404, Sonatrach is associated with Anadarko (which is associated with Agip and Maersk).
On block 406, the national company is associated with the Spanish Cepsa.
While on block 405, it is associated with Burlington Resources (which is associated
with Talisman).
The deposit has undergone an unitisation, which allows calculating each company's oil share. Currently, Cepsa has the greatest share .
Agip replaced Lasmo .