Natural gas in Sweetgrass arch area, northwestern Montana

Journal Article · Mon Jan 01 04:00:00 EST 1968 · Mem. - Am. Assoc. Pet. Geol.; (United States)

OSTI ID:5963770

Nordquist, J W; Leskela, W

The Sweetgas arch in northern Montana has yielded nearly 500 billion cu ft of natural gas since the first discovery in 1915. The 24 gas fields which have been found are mainly on the flanks of the arch. Most of the accumulations are in stratigraphic traps, but closures and faulting are controlling factors in some cases. Several fields have multiple pay zones. The producing formations, from oldest to youngest, are the Sun River Dolomite of Late Mississippian age; the Sawtooth Formation of Middle Jurassic age; the Swift Formation of Late Jurassic age; and the Cut Bank Sandstone, Sunburst Sandstone, and Blackleaf Formation of Early Cretaceous age. All of the reservoir rocks are sandstone except the Sun River Dolomite. The Lower Cretaceous reservoirs are the most important gas zones in the area, having contributed more than 90% of the cumulative yield.

• Research Organization: Phillips Petroleum Co.
• OSTI ID: 5963770
• Journal Information: Mem. - Am. Assoc. Pet. Geol.; (United States), Journal Name: Mem. - Am. Assoc. Pet. Geol.; (United States) Vol. 1:9; ISSN MAPGA
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
030300* -- Natural Gas-- Drilling
Production
& Processing
CRETACEOUS PERIOD
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC TRAPS
GEOLOGY
JURASSIC PERIOD
MESOZOIC ERA
MINERAL RESOURCES
MISSISSIPPIAN PERIOD
MONTANA
NATURAL GAS
NATURAL GAS DEPOSITS
NATURAL GAS FIELDS
NATURAL GAS WELLS
NORTH AMERICA
PALEOZOIC ERA
PRODUCTION
RESERVOIR ROCK
RESOURCES
ROCKY MOUNTAIN REGION
STRATIGRAPHY
USA
WELLS