Exploratory drilling increased 14.4% in Oklahoma during 1958 with 24.3% success; development drilling decreased 2.3% with 67.9% success. Significant new-field discoveries include the East Goodwin of Ellis County, the North Buffalo of Harper County, the Northeast Cheyenne Valley of Major County, the North Dover of Kingfisher County, and the West Enville of Love County.

Close-in outpost drilling, coupled with high-resolution structural and stratigraphic investigations, led to the unusually high exploratory success ratio. This, in turn, has encouraged additional leasing until an all-time high of approximately 60% of the state is under lease.

Seismic activity decreased slightly as compared with previous years. Secondary recovery and production from unallocated “stripper” oil fields continue to account for more than half the oil production in the state.

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First page of Developments in Oklahoma in 1958<xref ref-type="fn" rid="fn1"><sup>1</sup></xref>
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