The Healdton Arbuckle oil field of Carter County, Oklahoma, is an example of a large reservoir for which ample subsurface information was available to the exploration geologist prior to discovery. In the application of refined and sophisticated exploration techniques elsewhere, the industry ignored basic and fundamental subsurface facts in this area. This pool is located in the middle of a productive zone that pre-dates World War I. Oil in the Arbuckle actually was produced from this reservoir for many years before the Sinclair No. 1 Ratcliff was drilled to find what is now recognized as the Healdton Arbuckle field. This paper deals with the facts leading to the Sinclair discovery and it attempts to reveal how they may be used to find additional pools. It is felt that a b sic understanding of the producing pool is requisite to intelligent exploration for additional traps of a similar type.

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