PROVEN PETROLEUM SYSTEM & MULTIPLE PLAYS
Tumbes Basin Petroleum System
- The Tumbes Basin is a forearc basin west of the Andes, above the subducting Pacific oceanic plate.
- 10km of sedimentary fill with multiple source, seal and reservoir sequences ranging in age from Eocene to Recent.
- Proven source rocks within the Heath and Mancora Formations within oil/gas maturity window in the TEA area.
- Both source rock intervals appear to be generating hydrocarbons.
- Primary play interval focused on Zorritos Formation, which has yielded the majority of the discoveries in the basin.
- The Mancora Formation sands are also commercially significant and host Piedra Redonda gas field.
- Regional mapping over the 3D seismic data has been completed and now more detailed studies of additional prospective structures outside seismic repro areas are underway.
PROVEN PETROLEUM SYSTEM & MULTIPLE PLAYS
Tumbes Basin Play Concepts
- Only one well in the basin, Marina1-X, has been drilled using 3D seismic data.
- Marina1-X targeted Tumbes reservoirs which were not well developed.
- The deeper Zorritos Formation is the primary reservoir objective in the basin.
- Zorritos reservoirs in structures such as Raya and Bonito, and several others, are well situated to receive a charge from Heath Formation source rocks.
- The Piedra Redonda Field is most likely to have been charged by Mancora source rocks which are in the gas window downdip of the structure.
- Many faults do not penetrate the Mancora and thick overlying Heath shales are likely to be a barrier to vertical migration meaning most of the Zorritos targets should be shielded from a Mancora gas charge.
TARGET RICH ENVIRONMENT
Tumbes Basin Cross Sections
- The subducting Pacific plate causes variation in the regional stress field resulting in rapid subsidence, abundant faulting and periods of folding and uplift.
- There are a wide variety of structural and stratigraphic play types because of the structural history.
- Heath Formation (source rock) is at peak oil maturity over most of the TEA area.
- Mancora Formation (source rock) is estimated to be gas mature over a significant part of TEA.
