San Martín and Cashiriari
compose the Camisea Gas Fields. These two fields are located
approximately at 500 kilometers from the east of Lima city,
in the Amazonian jungle.
The San Martín field
was discovered in 1984 when drilling the San Martín
well 1. The Cashiriari well 1 unveiled the Cashiriari field
in 1986.
To date, three wells have
been drilled in each and every one of these fields, San
Martín wells 1, 2 and 3 in the San Martín
field and Cashiriari wells 1, 2 and 3 in the Cashiriari
field.
Regionally, these fields
are in a sub-Andean fold strip with over thrust of the Ucayali
Basin. The reservoirs of the basin are clastic sequences
of the Cretaceous and Permian Age. The productive horizons
of Permian Age are the Ene formation, the Noi lower and
upper members of the Ene formation, and the Nia Kaatsirinkari
formation (Lower Nia). The Nia Upper formation of Cretaceous
Age and the formation of the upper Cretaceous: Chonta and
Vivian lie here over a regional discordance. Vivian is probably
the most important reservoir in the Peruvian sub-Andean
basins.
The Cashiriari and San
Martín fields are anticlines with an east-west strike.
The Cashiriari structure has a 30 by 5 kilometers dimension.
The anticline is delimited in the north by the Cashiriari
overthrust fault. A combination of structural relief and
sealing faults produce the closure. The San Martín
anticline has a 10 by 4 kilometers dimension. The closure
in the east, west and south sides is based on the structural
relief, while the closure in the north side has an overthrust
fault.
The Camisea area reservoirs
are Retrograde Gas-Condensate type supported by water drive,
and the water bearing of which has an unknown size. Additionally,
the reservoirs have a double porosity and permeability behavior
due to the presence natural fractures.
During the field exploitation,
it will be convenient to maintain the reservoir pressure
by recycling dry gas in order to minimize the retrograde
condensation of liquids within the reservoir and thus maximizing
the final recovery of gas liquids.
The proven hydrocarbon
reserves in Camisea fields, expressed in Tcf (Trillion of
cubic feet) for the Natural Gas and in MMBls (Million of
Barrels) for Gas Liquids are as follows:
PROVEN RESERVES
PROVEN
RESERVES - CAMISEA FIELDS |
Block
88 |
| Fields |
Natural Gas(10
12 Cubic Feets) |
LGN (Million
of barrels) |
| San Martín |
2,86 |
247,34 |
| Cashiriari |
5,26 |
269,58 |
| Total |
8,12 |
516,92 |
