Document Type : Original Research Paper

Authors

• Golnaz Abbasi ¹
• Ali Solgi ²
• Mohsen Pourkermani ³
• Hosein Motamedi ⁴
• alireza farrokhnia ⁵
• Keivan Orang ⁶

¹ Department of Geology, Science and Research branch, Islamic Azad University, Tehran, Iran

² Assistant Professor, Departement of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran

³ Professor, Department of Geology, North Tehran ranch,Islamic Azad university,Tehran,Iran

⁴ Assistant Professor, Geology Office, Exploration Directorate, National Iranian Oil Company, Tehran, Iran.

⁵ Department of geology, karaj branch, islamic azad university, karaj, iran.

⁶ Master of Science, Geology Office, Exploration Directorate, National Iranian Oil Company, Tehran, Iran.

Abstract

We used 2D seismic profiles, field observation and well data to constrain the structural evolution of the Saveh basin during the late-lower Miocene to late Pliocene. During this time period almost 8-9 kilometers of Upper Red Formation (URF) and the Pliocene conglomerates were deposited in the basin depocenter. During the late- lower Miocene (to early- middle Miocene ?), Syn-depositional activity of west-east-northwest-southeast trending high-angle fault zones, with an extensional component, created accommodation space for deposition of lower Upper Red Formation. Since the late- middle Miocene (or late Miocene), initiation of a compressional phase has resulted in regional deformation.The deposition of upper part of the URF and the Pliocene conglomerates was contemporaneous with compressional deformation. During this stage, the middle part of the URF acted as an effective detachment horizon and detachment folds, such as the Saveh and Taraz Naeen anticlines, were formed. The thinning of the Pliocene conglomerates towards the crestal point of these folds indicates late structural growth. According to the top Qom depth map, there are no traps with fault independent closure within the Saveh basin. The top of the Qom Formation is estimated at -4250 m in the Taraz Naeen anticline.

Keywords

• Saveh"
• Central Iran basin"
• Upper Red Formation"
• Qom Formation"
• Koushk-e-Nosrat Fault

20.1001.1.10237429.1397.28.110.18.8

Main Subjects

• Tectonics