globalchange  > 气候变化与战略
DOI: 10.1007/s13146-019-00537-9
论文题名:
Facies analysis and depositional setting of the upper pliocene Akchagyl Formation in southeastern Caspian Basin, NE Iran
作者: Soltani B.; Beiranvand B.; Moussavi-Harami R.; Honarmand J.; Taati F.
刊名: Carbonates and Evaporites
ISSN: 8912556
出版年: 2020
卷: 35, 期:1
语种: 英语
英文关键词: Akchagyl Formation ; Depositional setting ; Facies analysis ; NE Iran ; Southeastern Caspian Basin
Scopus关键词: alluvial fan ; depositional environment ; facies analysis ; hydrocarbon reservoir ; lacustrine environment ; lithology ; mudflat ; Neogene ; Paleogene ; petrography ; Pliocene ; sediment yield ; stratigraphic correlation ; subsidence ; tectonic setting ; transgression ; Caspian Basin ; Iran ; Cardium ; Discoaster brouweri ; Discoaster pentaradiatus ; Globigerinoides fistulosus ; Pullenia
英文摘要: Pliocene deposits of the Cheleken and Akchagyl Formations constitute the most important hydrocarbon reservoirs in the Caspian Basin of Iran and other adjacent countries. In this study, facies characteristics and depositional setting of these sequences were examined using detailed field observations, petrographical studies, wireline-log and 2D seismic interpretations. Three outcrop sections were measured as the oldest and thickest Paleogene–Neogene units in the southeastern part of the Caspian Sea. Based on macroscopic and microscopic investigations, eleven sedimentary facies were identified in the studied sequence. These facies indicate deposition in alluvial fan, mud-flat, foreshore, shoreface and offshore of a wave-dominated lacustrine environment. The Akchagyl Formation is mainly composed of foreshore and shoreface facies with low gamma-ray values, which grades into offshore facies towards southwestern parts of the basin. The presence of marine biota such as Globigerinoides fistulosus, Ammonia becccarii, Pullenia praecursor, Cardium dombra and nanoplanktons (Discoaster brouweri and Discoaster pentaradiatus) demonstrate that this lacustrine setting was periodically connected to the global oceans, particularly in the Late Pliocene–Pleistocene. The stratigraphic correlation of the studied sections shows significant changes in lithology, facies and thickness of the Pliocene deposits. These changes were controlled by tectonic subsidence and clastic sediment supply during the Early-to-Middle Pliocene along with sea-level fluctuation as a consequence of the Akchagylian transgression episode in the Late Pliocene. Lateral changes in the geological parameters of the Akchagyl deposits indicate a more stable condition within the most part of the study area, especially towards the South Caspian Basin. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159097
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作者单位: Department of Petroleum Geology, Research Institute of Petroleum Industry (RIPI), Tehran, Iran; Department of Geology, Ferdowsi University of Mashhad, Mashhad, Iran; Department of Geology, Khazar Exploration and Production Company (KEPCO), Tehran, Iran

Recommended Citation:
Soltani B.,Beiranvand B.,Moussavi-Harami R.,et al. Facies analysis and depositional setting of the upper pliocene Akchagyl Formation in southeastern Caspian Basin, NE Iran[J]. Carbonates and Evaporites,2020-01-01,35(1)
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