Abstract
A study of the Heath (Mississippian) and lower Tyler (Pennsylvanian) sediments of central Montana suggests a close relationship between the oil accumulations and the relative positions of the Heath Limestone and the lower Tyler sandstones. Reconstruction of the pre-Amsden structure and the Tyler-Heath paleogeology shows that the oil accumulations at Sumatra, Stensvad, Ivanhoe, Keg Coulee, Bascom, Melstone, and Big Wall fields occur where the paleo-structural position of the lower Tyler sandstones is updip from, and in direct contact with, the Heath Limestone. The foregoing relationships seem to be further supported by a study of Alice and Porcupine domes. These domes have barren sandstone reservoirs in excellent structural-stratigraphic traps. The paleo-structural attitud in the area of the domes was flat and the Heath Limestone apparently not well developed. Application of these reservoir-source relationships should be useful in exploring for new oil reserves in the lower Tyler. The concept also may be applicable in other geologic provinces. End_of_Article - Last_Page 1573------------
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