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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract


Pub. Id: A010 (1972)

First Page: 42

Last Page: 46

Book Title: M 16: Stratigraphic Oil and Gas Fields--Classification, Exploration Methods, and Case Histories

Article/Chapter: Unconformity Traps: Geologic Exploration Methods

Subject Group: Field Studies

Spec. Pub. Type: Memoir

Pub. Year: 1972

Author(s): Philip A. Chenoweth

Editor(s): H. R. Gould

Abstract:

Accumulations of oil and gas are closely related to Previous HitunconformitiesNext Hit in almost every oil region of the world. Except for classifications and early attempts to utilize them in regional correlations, the location, origin, and geometry of successive Previous HitunconformitiesNext Hit largely have been ignored.

Previous HitUnconformitiesNext Hit occur in every tectonic and depositional environment. They are most common on the continental platform, where disconformities occur in close rhythmic succession. In the coastal areas between basin and platform, frequent warping has resulted in intersecting low-angle Previous HitunconformitiesNext Hit. Basins have the fewest Previous HitunconformitiesNext Hit, but angular Previous HitunconformitiesNext Hit may occur associated with midbasin uplift and diapirism.

In the typical platform area, traps above disconformities are mainly in quartz sandstones and are long and narrow; carbonate rocks are the principal reservoirs beneath disconformities. Traps in the hinge area between the platform and the basin are associated with low-angle Previous HitunconformitiesNext Hit; they are commonly very large and generally have arenaceous reservoir rocks. In basins not later deformed by tectonism, most unconformity traps are on the upthrown side of growth faults and on and around midbasin ridges, where submarine erosion has produced local Previous HitunconformitiesTop. Reservoir rocks are commonly thin and discontinuous, fine-grained turbidites and residual sandstones.

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