Abstract
Abstract The Sand Wash basin of northwestern Colorado and south-central Wyoming yields natural gas from rocks of Tertiary and Cretaceous ages. The first discovery of gas was from the Tertiary in 1927, but because of market conditions, development has been slow. In recent years an active exploration program has resulted in markedly increased reserves which, as of 1965, exceeded 550 billion cu ft of high-methane gas. The accumulation of hydrocarbons in the basin is controlled chiefly by structural closure, but only parts of the total Tertiary and Cretaceous stratigraphic column yield gas. A detailed knowledge of the distribution of selected reservoir rocks in relation to the structural configuration will be important in the discovery of new reserves within the basin.
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