Oil and gas production in Poison Draw field, discovered in 1972, is from the lower sand bed of the Teckla sand member of the Lewis Shale (Late Cretaceous). Oil production has passed the one-million-bbl mark and is expected to exceed eight million bbl of primary production.

The pool is contained in a stratigraphic trap formed in a delta-front environment where strong long-shore currents and wave action formed a northwest-southeast trending system of beaches and delta-front bars. The Poison Draw Teckla pool produces from an undersaturated, underpressured sandstone reservoir.

Development drilling on the east updip margin and in the northern part of the field is still active. The recent increases in crude oil prices have greatly enhanced the economic potential of the field.

One other Teckla sand pool already has been found and further exploration drilling may find additional Teckla sand pools in the southern Powder River basin.

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