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Information Journal Paper

Title

SEQUENCE STRATIGRAPHY OF ALBIAN-CENOMANIAN SEDIMENTS (AITAMIR FORMATION) IN EAST OF KOPET-DAGH BASIN, BASED ON SURFACE AND SUBSURFACE DATA

Pages

 Start Page 103 | End Page 120

Abstract

 One of the major petroliferous basins covering a larg part of Turkumenstan, Afghanistan and northeast Iran is the Kopet-Dagh intracontiental basin. The AITAMIR FORMATION is deposited during Albian- Cenomanian in this Basin. This Formation is composed of Glauconitic sandstone, mudstone and limestone which rests comformably on the Sanganeh and overlies the Abderaz Formations. Surface and subsurface studies show that the AITAMIR FORMATION was deposited in lagoon to shallow open marine environments. Transgressive system tract (TST), high stand system tract (HST) and low stand system tract (LST) in these sections have been interpreted based on lateral and vertical lightfaces variations as well as abundance of glaucony and bioclastic grains. Identified depositional sequences in the studied area range from 2 (Shurijeh section) to 6 (Khangiran well numbers 35, 40). Sequence boundaries in all studied sections (except the upper boundary of last depositional sequence) are type 2 (SB2). Interpreted sea-level curve at the fall of sea-level during the Cenomanian Time can be relatively correlated with the global sea-level curve.

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