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ABSTRACT: Camago No. 1, a Gas and Condensate Discovery along the Deepwater Lower Miocene Reef Trend, NW Palawan Offshore, Philippines

Duenchien Mou, Don F. Collins

A new productive lower Miocene pinnacle reef trend has been found offshore of Northwest Palawan Island in the Philippines in extreme water depths. Oil and gas shows were encountered by Camago No. 1 from top of the reefal limestone to the total depth, a gross hydrocarbon column of more than 2147 ft. The limestone matrix is generally tight and extensively recrystallized, but abundant vugs and solution fractures throughout the section provide a significant pore volume and excellent permeability. A drill stem test performed of the interval 9783-9828 ft flowed gas and condensate at a stabilized rate of 24.6 MMcf and 809 bbl per day.

The Camago No. 1 well was drilled by Occidental to test a seismically defined lower Miocene reefal anomaly under 2416 ft of water in its offshore northwest Palawan Contract area. This anomaly is separated from the existing shallow-water oil-producing Nido-Pandan-Matinloc fields by a deep, probably Paleogene half-graben. Hydrocarbons are believed to have been generated from the graben and migrated laterally into the lower Miocene reefal traps on both sides of the graben. Random occurrences of oil and gas in the nearby productive Philippine fields suggest the new deep-water trend could also be productive of oil. Three additional similar large reefal anomalies along the trend remain to be tested.

AAPG Search and Discovery Article #90097©1990 Fifth Circum-Pacific Energy and Mineral Resources Conference, Honolulu, Hawaii, July 29-August 3, 1990