Abstract

The La Brea-Parinas oil-field region on the northwest coast of Peru is composed of a thick section of block-faulted Cretaceous-Eocene marine clastic sediments overlying late Paleozoic crystalline basement rocks and locally covered by Pleistocene marine calcareous deposits. Accumulation of oil, which is produced mainly from sand zones in the Parinas and other Eocene formations, is broadly related to the presence of two east-west pre-Tertiary structural highs, and locally controlled by the complex pattern of normal faults.

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