About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 38 (1954)

Issue: 8. (August)

First Page: 1645

Last Page: 1652

Title: Source-Bed Problem in Velasquez Field, Colombia

Author(s): W. S. Olson (2)


The Velasquez oil field is in the Middle Magdalena Valley, Colombia, S. A., which is a long, narrow, Tertiary basin. The sedimentary section consists of approximately 8,000 feet of clastic continental beds which rest directly on a crystalline basement. These Tertiary beds increase as much as four-fold in thickness toward the southeast, without any evidence for marine intercalations.

The nearest marine beds are the Villeta formation of Cretaceous age in the Cordillera Oriental which is separated from the Velasquez area by the Belta fault. This fault extends for a great distance along the east side of the Magdalena Valley.

If the Villeta formation is the source of Velasquez oil, it is necessary to postulate migration on the order of several miles and date it as late Tertiary, but prior to the thrusting represented by the Belta fault.

Pay-Per-View Purchase Options

The article is available through a document delivery service. Explain these Purchase Options.

Watermarked PDF Document: $14
Open PDF Document: $24

AAPG Member?

Please login with your Member username and password.

Members of AAPG receive access to the full AAPG Bulletin Archives as part of their membership. For more information, contact the AAPG Membership Department at [email protected].