| Relationships | Role | Relationship Start | Relationship End |
| Compagnie Financiere De Paribas | Parent | 12/31/1980 | 10/1/1984 |
| Opfi-Paribas | Parent | 12/31/1980 | 10/1/1984 |
| Societe De Gestion Et D'interets Petroliers (Sogedip) | Parent | 12/31/1980 | 10/1/1984 |
| Banque Paribas Suisse S.A. | Parent | 12/31/1980 | 12/30/1983 |
| Corexcal, Inc. | Subsidary | 12/31/1983 | 10/1/1984 |
| Simpson Oil And Gas Co. | Subsidary | 12/31/1982 | 12/30/1983 |
| Corexcal, Inc. | Subsidary | 12/31/1981 | 12/30/1982 |