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AAPG Bulletin

Abstract

Volume: 33 (1949)

Issue: 9. (September)

First Page: 1579

Last Page: 1589

Title: Manantiales Field, Magallanes Province, Chile

Author(s): C. R. Thomas (2)

Abstract:

The discovery well found oil in December, 1945. It was known as Springhill No. 1, but the name of the field, by Presidential Proclamation, was later changed to Cerro de los Manantiales. This well was located on a seismic high.

It is probable that the basement rocks in this area were reached in Manantiales No. 2, but this is not definite. About 1,000 meters of the Serie Tobifera, 10-35 meters of the Springhill formation, 750 meters of Upper Cretaceous rocks, and about 1,500 meters of Tertiary and Quaternary rocks are present in this locality.

The structure, according to the seismic map, is fairly large. Development, to date, has generally followed the seismic picture, but these data, due to poor records, are not sufficiently accurate to make new locations.

Some small faults, which may well affect the accumulation, have been observed in the area. At least one of these extends upward into the Tertiary rocks.

The oil is high-gravity, about 42° Be., and the gas is rich in gasoline. Due to lack of storage, no lengthy tests have been made, but most of the oil wells have produced 25-35 barrels per hour on ¼-inch choke. Their ultimate capacity is not known but it is much greater than this.

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