The pre-Tertiary metamorphics in the Edison oil field have, since the discovery of this zone by H. H. Magee in June, 1945, yielded 3,330,000 barrels of oil to August 31, 1946. Of the one hundred and three wells which have since been drilled into the basement during its development, all but six have been completed as commercial producers.

Oil has accumulated within the metamorphics in approximately the same area that contains oil in the overlying sediments. The oil produced from the basement is similar to that of the oil produced from the sands, although gravities vary greatly.

Wells with highest initial potentials and highest productivity indices are those completed in the hard, fresh fractured rocks on locally developed structural highs on the Edison uplift.

End_of_Article - Last_Page 2090------------