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TECTONICA DE PLACAS

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PERU Peru covers 1,285,216 km2 (496,225 sq mi). It borders Ecuador and Colombia to the north, Brazil to the east, Bolivia to the southeast, Chile to the south, and the Pacific Ocean to the west. The Andes Mountains run parallel to the Pacific Ocean; they define the three regions traditionally used to describe the country geographically. The coast, to the west, is a narrow plain, largely arid except for valleys created by seasonal rivers. The highlands is the region of the Andes; it includes the Altiplano plateau as well as the highest peak of the country, the 6,768 m (22,205 ft) Huascaran. The third region is the jungle, a wide expanse of flat terrain covered by the Amazon rainforest that extends east. Almost 60% of the country's area is located within this region.

HYDROCARBON BASINS

They are large asymmetric structural located along and parallel to the Andes, filled of marine and continental sediments with hydrocarbon potential. Peru basins match with 3 natural regions:

 Foreland Basins, west of the Brazilian - Guyana shield – (9)

 Fold Thrust Belt Styles – (8)

 Fore and Back arc in extensional structural styles, Onshore (4) and Offshore (3).

Kiko Valencia 2011

TALARA BASIN

Drilling in the Talara Basin started in the late XIX century. In the late half of the XX century active oil companies were Compañia Petrolera Lobitos, the state oil company Petrolera Fiscal and Exxon’s International Petroleum Company until 1970. IPC acquired the “Concesiones Lima” from the Compañia Petrolera Lobitos in the 1950’s. Production in NW Peru comes mainly from the offshore and onshore Talara basin fields and minor production from small onshore Tumbes Basin fields. Old onshore fields were compartmentalized as smaller production units from the 80´s and are currently operated by several oil companies.

The present-day structural configuration of the Talara Basin is

the result of complex extensional and gravitational tectonics

that occurred during Paleocene and mainly during middle

Eocene times, with reactivation in Neogene time. The Talara

Basin overlies a larger morphological configuration of

Cretaceous and Paleozoic tectonic events.

Gerardo Pozo 1999.

The structural style of the Paleogene Talara Basin is characterized by normal faulting, as well as

low-angle gravitational faults and large vertical transcurrent faults. This tectonic style has resulted

in a number of rollover anticline structures, rotated fault blocks and growth faulting associated

with deep listric normal faults. According to regional mapping and seismic interpretation, faulting

is more intense in the onshore portion and shallow offshore platform of the Talara Basin. A

regional crosssection in the northern part of the Talara and Tumbes Basins indicates a regional

tilting to the west

The sedimentary fill of the Talara Basin is controlled by structural deformation that has produced a

complex clastic sedimentary sequence with a wide variation of formation thicknesses throughout

the basin. The synsedimentary extensional tectonics is represented by rollover anticline structures

associated with high and low-angle listric normal faults. The relative movement of the listric

normal faults is directly related to the configuration of Paleozoic and Basement rocks.

SALAVERRY BASIN

The Salaverry Basin is in exploration stage by Savia Peru. It is a

very young inner forearc basin containing more than 4 Km. of

sediments generally no older than Middle Miocene in age. Its

evolution begins during Paleocene as an east platform of Trujillo

basin. It is located in the North of the Peruvian Shore. Structurally

the basin is quite simple and has the geometry of an almost

symmetrical, elongated oval. The basin is punctuated by a series

of NW-SE to N-S trending wrench faults. In the northern part of

the basin a very prominent WNW-ESE trend is present which cuts

only the shallow section and does not affect basement. Another

interesting feature about the Salaverry Basin is in the abundance of intrusive bodies seen

emplaced within the Tertiary section.

Overlying basement of Mesozoic age, four main sedimentary sequences have been recognized in

the geological evolution of the Salaverry Basin, the Lower Miocene, Middle Miocene, Upper

Miocene and Plio-Quaternary. To the west of the basin along the Salaverry High, sediments of

Upper Eocene age are seen onlapping basement and further west yet in the much deeper Trujillo

Basin, rocks of Oligocene and Lower to Middle Eocene are also encountered. Although Eocene

through Oligocene rocks have not been interpreted in the Salaverry Basin. No mature source rock

can be postulated for the Salaverry Basin. Any hydrocarbon charge received in the basin would

have

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