Structure and Prospects of Alpine Basins or Exploration in Mature Areas
1993; American Association of Petroleum Geologists; Volume: 77; Linguagem: Inglês
10.1306/bdff806a-1718-11d7-8645000102c1865d
ISSN1558-9153
Autores Tópico(s)Geological and Geophysical Studies Worldwide
ResumoSince the first discovery of relatively small and complex oil fields in the Foothill Belt of the Taurus Mountains in southeast Turkey, the area has been the subject of extensive geological and geophysical surveys. Recently acquired three-dimensional seismic data within the NV Turkse Shell lease areas has enabled substantial advances in the understanding of the detailed subsurface structure, deformational history, and relationship between fields and structures. The historical view of the genesis of the southeast Turkey Foothill Belt is that the terranes presently incorporated in the imbricated zone formed a positive (forebulge) area at the Arabian platform edge in the Cretaceous. Coeval with Upper Mardin and Kastel Formation deposition in the Late Cretaceous, the platform edge was significantly deformed, ultimately leading to imbrication. The location of the breakthrough of the basal thrust plane coincided with the forebulge area. These structures are typical examples of imbricate structures in a foreland setting. Individual thrust sheets are relatively thin, comprising a layered sedimentary sequence, and have a length that is several times greater than their thickness. In the west, thrust imbricates are relatively thin and thrusting involved gentle folding. In the east, the imbricates are much thicker and larger amplitude folding led tomore » higher dips. This difference is caused by the presence, in the east, of a clastic sequence that overlies the argillaceous units of the Dadas Formation. This clastic sequence is progressively cut out to the west such that in the Beykan area, the Cretaceous carbonate sequence lies almost directly on top of the basal shales. In the area occupied by the Kurkan, Kayakoy, and Kayakoy West structures, deformation resulted in a stack of smaller imbricates. This is in contrast with the Beykan area where the deformation resulted in one large imbricate structure.« less
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