Abstract
The lithostratigraphy and biostratigraphy specifications of the Sarvak Formation are considered to study in wells No. 2, 16 and 66 of Rag-e-Safid oilfield. They are located at the southeast of Ahwaz (the southwest of Iran). The lithology of the Sarvak Formation in all the wells mostly consists of limestone. The depth of the Sarvak Formation in well No. 2 is 720 m; in this well, the Sarvak Formation overlies the Kazhdumi Formation and underlies the Papdeh Formation. Vertical distribution of recognized foraminifera, macrofossils and calcareous Algae identifies two biozones: 1) Favusellawashitensis Range zone; 2) Praealveolinacretacea-Ovalveolina ovum & Rudistfragment Ass. zone. The thicknesses of the Sarvak Formation in wells No. 16 and 66 are about 100 m and 108 m, respectively; in a part of the Sarvak Formation, drilling was completed, while its upper boundary is covered with the Papdeh Formation, in both wells. In terms of biostratigraphy studies in wells No. 16 and 66, one assemblage biozone is recognized as Praealveolinacretacea-Ovalveolina ovum & Rudistfragment Ass. Zone, similarly. Finally, the age of the Sarvak Formation is determined as the Cenomanian in three considered wells.
Highlights
The NW-SE trending in the Zagros mountain range is located in the south and the southwest of Iran
Kalaleh [7] studied the southern area of Dezful embayment and biostratigraphy and lithostratigraphy of the Sarvak and Ilam Formations
The stratigraphic succession of the Sarvak Formation is described in three wells of Rag-e-Safid oilfield in the southwest Iran by two biozones consisting of foraminiera and fragments of macrofossils and calcareous Algae that suggest a Cenomanian age
Summary
Kalaleh [7] studied the southern area of Dezful embayment and biostratigraphy and lithostratigraphy of the Sarvak and Ilam Formations. Omidvar et al [13] studied the depositional environment and biostratigraphy of the upper Sarvak Formation in well No 63 of Ahwaz oilfield. A recent work by Kaviani and Babazadeh [14] considered the eastern area of Iran in the southwest of Qaen; they carried out the biozonation of Lower Cretaceous sediments (Aptian) in Mazarnow and Hassan-Afzal. The stratigraphic succession of the Sarvak Formation is described in three wells of Rag-e-Safid oilfield in the southwest Iran (the southeast of Ahwaz) by two biozones consisting of foraminiera and fragments of macrofossils and calcareous Algae that suggest a Cenomanian age. Lithostratigraphic and biostratigraphic columns of the Sarvak Formation are drawn, and the lithostratigraphic columns are correlated for wells No 2, 16 and 66
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