This paper presents a summary of the history, geology, and development of the Slick-Wilcox field, DeWitt and Goliad counties, Texas, from its discovery until April, 1947.

The Slick-Wilcox field is located on the DeWitt-Goliad County line southeast of the town of Nordheim. The surface is underlain by southeasterly dipping Tertiary beds.

Oil was discovered in the “Pettus” sand in the Cockfield member of the Yegua formation in December, 1930. Discovery was the result of surface structural mapping. Shallow “Pettus” production was largely abandoned after 1937, and deeper oil was produced from the third sand of the upper Carrizo-Wilcox section in May, 1943. Location for the well which discovered the deeper producing sand was made from subsurface information gained from geophysical prospecting.

The accumulation of oil occurs in a faulted dome. The oil is trapped against a normal fault upthrown on the north.

The oil is being produced by a combination of the forces resulting from a natural water drive and an expanding gas cap. There are 48 producing oil wells in the field. By the end of March, 1947, the field has produced 4,339,599 barrels of oil from the producing zone in the Carrizo-Wilcox. The original recoverable reserve is estimated at 20,000,000 barrels of oil.

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