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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract


Pub. Id: A028 (1984)

First Page: 353

Last Page: 372

Book Title: M 35: Petroleum Geochemistry and Basin Evaluation

Article/Chapter: Previous HitMiddleNext Hit East: Stratigraphic Evolution and Oil Habitat

Subject Group: Geochemistry, Generation, Migration

Spec. Pub. Type: Memoir

Pub. Year: 1984

Author(s): R. J. Murris

Abstract:

The post-Hercynian sequence of the Previous HitMiddleNext Hit East is dominated by carbonate sedimentation on a stable platform flanked on the northeast by the Tethys ocean. Two principal types of depositional systems alternated in time: (1) ramp-type mixed carbonate-clastic units and (2) differentiated carbonate shelves. The first type was deposited during regressive conditions, when clastics were brought into the basin and resulted in "layer-cake" formations. The second type was formed during transgressive periods and is dominated by carbonate cycles separated by lithoclines, time-transgressive submarine lithified surfaces. Differentiation is marked, with starved euxinic Previous HitbasinsNext Hit separated by high-energy margins from carbonate-evaporite platforms.

The tectonic Previous HitdevelopmentNext Hit of the Previous HitMiddleNext Hit East can be divided into several stages. The first stage, which ended with the Turonian, was characterized by very stable platform conditions. Three types of positive elements were dominant: (1) broad regional paleohighs, (2) horsts and tilted fault blocks trending NNE-SSW, and (3) salt domes. All three influenced deposition through synsedimentary growth. The subsequent stage, from Turonian to Maestrichtian, was one of orogenic activity, with the formation of a foredeep along the Tethys margin and subsequent ophiolite-radiolarite nappe emplacement. From the Late Cretaceous to the Miocene the platform regained its stability, only to lose it again at the close of the Tertiary, when the last Alpine orogenic phase affected the region, creating the Za ros anticlinal traps.

Previous HitSourceNext Hit Previous HitrocksNext Hit were formed in the starved Previous HitbasinsNext Hit during the transgressive periods. Marginal mounds, rudist banks, oolite bars and sheets, and regressive sandstones form the main Previous HitreservoirsNext Hit. Supratidal evaporites and regressive shales are the regional seals. The spatial arrangement of these elements and the Previous HitdevelopmentNext Hit of Previous HitsourceNext Hit maturity through time explain the observed distribution of the oil and gas fields.

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