About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 38 (1954)

Issue: 8. (August)

First Page: 1661

Last Page: 1670

Title: Occurrence of Oil and Gas and Its Relation to Possible Source Beds in Continental Tertiary of Intermountain Region

Author(s): Wayne M. Felts (2)


Within the intermontane basins of the Intermountain region, the Great Basin, and the Columbia Plateau are enormous volumes of Tertiary continental sediments. These sediments may be classified on the basis of depositional loci into two general categories: (1) suites of sediments deposited in large lakes which in their later histories became saline, and (2) basin fills of fluvial, paludal, and fresh-water lacustrine beds associated with varying amounts of extrusive volcanics.

To sediments of the first type are attributed many of the properties of marine strata. They commonly contain pyrobituminous shales and dolomites, truly petroliferous shales and dense limestones, tar sands, and various semi-solid or solid bitumens. Oil and gas production has been established from such beds and closely associated strata. Though some of this hydrocarbon content in local areas may have migrated into place from subjacent marine strata, most of such occurrences are considered indigenous.

Sediments of the second type commonly are either lacking in hydrocarbon content or contain methane gas which can be shown to be entrapped emanations from intercalated lignitic beds or other swamp deposits. In the Columbia Plateau where beds of Miocene age are intercalated with a thick series of basalt flows, tarry residues from the distillation of organic matter have been mistaken for shows of oil.

Pay-Per-View Purchase Options

The article is available through a document delivery service. Explain these Purchase Options.

Watermarked PDF Document: $14
Open PDF Document: $24

AAPG Member?

Please login with your Member username and password.

Members of AAPG receive access to the full AAPG Bulletin Archives as part of their membership. For more information, contact the AAPG Membership Department at [email protected].