The North Coles Levee oil field was discovered in November 1938. The location for the discovery well was based on data obtained from a reflection seismograph survey run early in the same year. A contour map, based on these reflection data, was prepared after several months of geophysical field work and interpretation. This map outlined the structure with reasonable accuracy as shown by comparing it with the present subsurface contour map constructed from electric-log correlations in over one hundred wells which have been drilled in the field as of December 1946.

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