About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 65 (1981)

Issue: 5. (May)

First Page: 975

Last Page: 975

Title: Melones µ: Clay Controlled, Inclined Oil-Water Contact Reservoir, Orinoco Heavy Oil Belt: ABSTRACT

Author(s): Jose Rabasso-V., Gustavo Seitz

Article Type: Meeting abstract


The Melones µ reservoir is the topmost petroleum bearing sand of the Melones Field, which is located in the Eastern Venezuela basin, within the Orinoco heavy oil belt.

This huge reservoir contains 1.5 billion bbl of 8.2 to 10.3° API oil in situ. It is a shallow reservoir (1,900 ft or 579 m deep) and has an average thickness of 80 ft (24 m). The unconsolidated sand, with a dip of approximately 1°, contains variable amounts of dispered clay. The µ-sand is a stratigraphic accumulation which has an updip closure controlled by an increase in its clay content. The clastics of this unit were deposited in an alluvial meander belt environment.

Even though the oil-water contact of this giant accumulation is inclined, the reservoir is under hydrostatic conditions. The inclination of the contact is controlled by the sands' clay content. It is postulated that during migration the oil and water had similar densities resulting in the inability of the oil to displace the water except in clay-free areas. The low dip of the strata also did not aid the oil migration.

End_of_Article - Last_Page 975------------

Copyright 1997 American Association of Petroleum Geologists