| Relationships | Role | Relationship Start | Relationship End |
| Preussag Oil And Gas Corp. | Parent | 1/4/1984 | 5/10/1989 |
| Pecos Energy Corporation | Parent | 12/31/1988 | 5/10/1989 |
| International Oil And Gas Corp. | Parent | 1/4/1984 | 12/30/1988 |
| Pecos Energy Corporation | Parent | 12/31/1985 | 12/30/1988 |
| Preussag Oil And Gas Production Inc. | Parent | 1/4/1984 | 12/30/1986 |