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AAPG Bulletin

Abstract


Volume: 36 (1952)

Issue: 5. (May)

First Page: 857

Last Page: 877

Title: Chimire Field, Anzoategui, Venezuela

Author(s): E. L. Moore (2), J. A. Shields (2)

Abstract:

The Chimire field is in the Greater Oficina area of the state of Anzoategui in eastern Venezuela. The field was discovered by the Socony-Vacuum Oil Company of Venezuela when Chimire No. 2 was completed in January, 1948. On January 1, 1951, about 104 wells had been drilled, resulting in a production of more than 21,789,000 barrels and an average daily production of about 55,265 barrels. Proved area in the principal producing sand (L-4 of the Oligocene-Miocene Oficina series) aggregates about 9,000 acres and is about 10 miles in length and 3½ miles in width, with a productive structural flank against the fault trap of about 700 feet. Concessions within the field are held by the Socony-Vacuum Oil Company of Venezuela, the Creole Petroleum Corporation, and the Mene Grand Oil Company, C. A., the Mene Grande operating Creole concessions as well as its own.

The discovery well was located on a combination of surface geology, gravity, structure-drill, and reflection-seismic work, while subsequent development has been guided by seismic and subsurface data. Production is from sands in the Oficina formation (Oligocene-Miocene) and the Merecure (?) formation (upper Eocene-lower Oligocene). Tests indicate thirty-six potential producing sands in the Oficina and two in the Merecure(?), but to date production has been restricted to twenty-one sands in the Oficina and one in the Merecure(?). Exploration reserve estimates indicate an ultimate recovery in excess of 150,000,000 barrels.

Reservoir pressures in the Oficina sands are approximately 300 pounds per square inch less than hydrostatic pressure. The producing sands vary in thickness from a few feet to 80 feet and are lenticular. Drilling indicates that most reservoirs have small gas caps. Formation waters vary from 1,800 to 20,540 parts per million of chloride ion.

Dual-zone completions with only one sand in each zone are common practice, and all completions have been through gun perforations. Well spacing is approximately one well to 94 acres. Outlets for the field are through a 12-inch Socony line and a 16-inch Mene Grande line terminating at Puerto La Cruz on the Caribbean coast.

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