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The Williston basin, as a province for oil exploration, may be briefly summarized as follows:
1. An area of some 240,000 square miles.
2. A Mesozoic section averaging 6,000 feet in thickness, with possibilities for oil and gas accumulation in at least six zones which have not been adequately explored.
3. A Paleozoic section of 5,000-7,000 feet in thickness, consisting for the most part of carbonates, with porosity varying from fractures, to intergranular, to vuggy. At the present time, the principal objectives are in the Charles and Mission Canyon formations of Mississippian age, the Devonian, the Silurian, and the Ordovician. There are many zones which have porous zones and oil showings which should be considered as objective zones; thus, in the Paleozoic section fifteen separate zones in different parts of the basin may be classed as objectives.
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