The Chaveroo San Andres field is on the line separating Chaves and Roosevelt Counties, New Mexico. The field, located geologically on the south flank of the Matador arch on the Northwestern shelf, was discovered in March, 1965, with the completion of the Champlin Petroleum Company and Warren American Oil Company No. 1 Hondo State. This well was plugged back from a total depth of 9,100 feet to 4,400 feet. The field now has more than 250 wells. Production is a sour 24° A.P.I. gravity crude and the cumulative field production was 1,116,642 barrels of oil on August 1, 1966.

The discovery was made using a combination of subsurface geology and reflection-seismograph data. Oil production is from a gray to brown fine crystalline to granular anhydritic dolomite with fine vuggy intercrystalline and fracture-type porosity zones located 650 feet below the top of the San Andres of Guadalupian (Permian) age. A gross pay section of approximately 200 feet is in the field. The field structure consists primarily of a southward-plunging nose. Reservoir conditions are controlled by thin porosity zones which pinch out updip. Development in the field has slowed considerably and appears at present to be nearing completion.

Certain areas of the field have had water problems. It is hoped that different and improved completion techniques will cure these ills.

The Chaveroo field has rekindled interest and ideas about San Andres production on the Northwestern shelf. Another new field, Cato, has extended further the Levelland-Slaughter-Buckshot-Milnesand-Chaveroo trend toward the west. The future looks bright for further San Andres development in this area of New Mexico.

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