| Relationships | Role | Relationship Start | Relationship End |
| Coparex International (Coparex) | Parent | 12/31/1983 | 8/31/2001 |
| Cogei | Parent | 12/31/1983 | 10/1/1984 |
| Coparex International (Coparex) | Parent | 12/31/1980 | 12/30/1983 |
| Societe De Gestion Et D'interets Petroliers (Sogedip) | Parent | 12/31/1980 | 12/30/1982 |
| Cogei | Parent | 12/31/1981 | 12/30/1982 |
| Corexcal Resources, Inc. | Subsidary | 12/27/1994 | 8/31/2001 |
| Corexcal Oil & Gas, L.P. | Subsidary | 12/31/1994 | 8/31/2001 |
| Vinton Oil And Gas Co. | Subsidary | 12/20/1986 | 12/30/1990 |
| C. Ocemines | Subsidary | 12/31/1983 | 12/1/1985 |
| Acquisitions & Mergers | Role | Assets | Acct Method | Type | Transaction Date |
| Vinton Oil And Gas Co. | Seller | Discontinued | 12/31/1990 |