Abstract

In general, 1965 was a good year in the Northern Rockies. In Wyoming, overall drilling of 948 tests was down compared with previous years, but 32 new-field discoveries were made, 2 of which were of unusual significance because of their depth and apparent establishment of large reserves. Montana had its most active year to date with a total of 504 tests. Ten new fields, 6 pool discoveries, and 2 extensions resulted. Activity in South Dakota, while showing a significant statistical increase over recent years, was still nominal with only 31 tests having been drilled. In North Dakota, 240 wells were drilled, compared with 277 in 1964. One new-field wildcat, 3 extension wells, and 2 deeper-pool discoveries were drilled.

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