Stratigraphy and Palaeontology
Hossein Gholamalian; Mohammad Kazem Kamali
Abstract
Pteriomorpha, Heterodonta, Paleoheterodonta and Anomalodesmata bivalves from the Kazhdumi Formation of the Geno and Gerash sections in the southeast of Zagros Mountains are studied here. In order to this research, bivalve speies are identified and described as follow: Arctica angulata, Birostrina ...
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Pteriomorpha, Heterodonta, Paleoheterodonta and Anomalodesmata bivalves from the Kazhdumi Formation of the Geno and Gerash sections in the southeast of Zagros Mountains are studied here. In order to this research, bivalve speies are identified and described as follow: Arctica angulata, Birostrina concentrica, Ceratostreon flabellatum, Crassatella manzourensis, Flaventia belviderensis, Granocardium productum, Gyrostrea delettrei, Illymatogyra africana, Mytiloides concentricus, Neithea dutrugei, Neithea sp. 1, Neithea sp. 2, Paraesa faba, Pinna cfcretacea, Pholadomya fabrina, Pholadomya vignesi, Protocardia hillana, Pterotrigonia scabra, Rhynchostreon suborbiculatum, Tenea delettrei, Venericardia deserti. Many of these species excluding Ceratostreon flabellatum, Illymatogyra africana, Neithea dutrugei and Pterotrigonia scabraare reported for the first time from Iran. Kazhdumi Formation disconformably overlies the top of the Dariyan Formation and underlies the Gurpi Formation.
Petroleum geology
Haniyeh Ghayeni; Mohamad Hosein Mahmudy-Gharaie
Abstract
Investigating the hydrocarbon generation potential of the Kazhdumi Formation, as the most important oil source rock in the Zagros sedimentary basin, is of great importance. The expansion of the Kazhdumi Formation in the Zagros Basin has been associated with differences in sedimentation depth of the basin ...
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Investigating the hydrocarbon generation potential of the Kazhdumi Formation, as the most important oil source rock in the Zagros sedimentary basin, is of great importance. The expansion of the Kazhdumi Formation in the Zagros Basin has been associated with differences in sedimentation depth of the basin leading to varieties in sedimentary facies and the organic matter preservations. Five black shale samples from Perchestan and Tang-E Maghar sections were selected for analysis by Rock-Eval pyrolysis, and were compared to the data of 25 Kazhdumi samples from different oil fields of Nowrouz, Soroush, Azadegan and Chah-E Binak, previously studied in the Zagros Basin. Additionally, sedimentary environment and depositional conditions were investigated. Sedimentary and geochemical evidences indicate a dominant condition of high organic content shale deposition in the reducing to semi-oxidative environments. The values obtained for total organic carbon (TOC) ranged from 1.2 to 6.9%. Examination of the thermal maturity of the samples showed a wide range from the immature range to the middle oil window, which are often in the range of type II and III kerogens. Finally, the drawing of the TOC vs. S2 diagram represents the higher hydrocarbon generation potential of the Kazhdumi Formation in the Tang-E Magher section, and the TOC vs. HI diagram shows the greater oil generation in the Soroush field, compared to the other studied areas.
A. Yavari; M. Ghavidel syooki; M. R. Majidifard; S. H. Vaziri
Abstract
The Kazhdumi Formation is well exposed and accessible in Tang-e Maghar, northwest of Behbahan city, Zagros basin. In this area, this formation has a thicknees of 344 m and it mainly consists of alternation of black - gray shale with medium – thin-bedded cream – gray argillaceous limestone. ...
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The Kazhdumi Formation is well exposed and accessible in Tang-e Maghar, northwest of Behbahan city, Zagros basin. In this area, this formation has a thicknees of 344 m and it mainly consists of alternation of black - gray shale with medium – thin-bedded cream – gray argillaceous limestone. The lower contact of the Kazhdumi Formation is disconformable with Daryan Formation and conformable with the Sarvack Formation at the top. A total of 220 ammonite bearing surface samples were collected including the uppermost part of the Daryan Formation (5m) and the whole thickness of the Kazhdumi Formation (344m). This investigation resulted in 21 species (15 genera) which belong to six families. The encountered ammonite species of the upper part of the Daryan Formation and the whole Kazhdumi Formation consist of Douvilleiceras sp., Douvilleiceras cf. mammillatum, Epicheloniceras subnodosocostum– buxtorfi, Hypacanithoplites cf. elegnas, Acanthohoplites cf. aschiltaensis, Nolaniceras nolani, Parahoplites cf. melchioris, Venezoliceras sp., Venezoliceras cf. venezolanum, Mirapelia cf. buarquianum, Mirapelia sp., Oxytropidoceras carbonarium, Oxytropidoceras cf. roissyanum, Hysteroceras cf. orbignyi, Hysteroceras sp., Tonohamites cf. aequicingulatus, Mortoniceras sp., Mortoniceras aff. inflatum, Dufrenoyia sp., Hemiptychoceras cf. gaultinum and Scaphites sp.Amongst these ammonite species, Scaphites sp. and Hemiptychoceras gaultinum are recorded for the first time and the remainder has previously been recorded from this rock unit in the Zagros basin. Likewise, based on stratigraphic potential of the encountered ammonite species the lower Aptian is suggested for the upper part of the Daryan Formation and upper Aptian –upper Albian for the Kazhdumi Formation.Therefore, a hiatus is present between the Daryan and Kazhdumi formations, encompassing the middle Aptian.
A Asadi; M.R Majidi fard; S.H Vazirii; M Yousefi rad
Abstract
Considering importance of ammonite fauna in biostratigraphy and sedimentary basins and due to the lack of studies on the ammonite fauna in the Kazhdumi Formation, the Nar stratigraphic section was selected and studied in the coastal Fars, northeast of Kangan (East Bushehr). The formation with a ...
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Considering importance of ammonite fauna in biostratigraphy and sedimentary basins and due to the lack of studies on the ammonite fauna in the Kazhdumi Formation, the Nar stratigraphic section was selected and studied in the coastal Fars, northeast of Kangan (East Bushehr). The formation with a thickness of 87 meters in the studied section contains alternation of cream to brown limestone and brownish red marl. The lower boundary with the carbonate of the underlying Dariyan Formation is unconformable and in the upper boundary is gradually covered by the Madoud Member of Sarvak Formation. In the present study, 110 ammonites have been collected which are belong to three genera and seven species. These include Knemiceras sp., Knemiceras persicum, Knemiceras dubertreti, Knemiceras syriacum, Knemiceras comperessum, Tegoceras camatteanum and Lyelliceras lyelli. Based on these one subzone was differentiated indicating a late Early to Middle Albian age for the formation.
M. Dehghani; S. Dehghani; V. Ahmadi; A. Zavarei
Abstract
Two stratigraphic sections of Kazhdumi Formation were selected form Sivand (165m.) and Kuh-e-khanekat (108m.) Areas for Pelecypoda avd Echinoides study. Recognized taxones of Bivalvia and Echinoides are following as: Neithea striatocostata, Exogyra undata, Isocardia aff. neglecta, Astarte sp., Opis sp., ...
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Two stratigraphic sections of Kazhdumi Formation were selected form Sivand (165m.) and Kuh-e-khanekat (108m.) Areas for Pelecypoda avd Echinoides study. Recognized taxones of Bivalvia and Echinoides are following as: Neithea striatocostata, Exogyra undata, Isocardia aff. neglecta, Astarte sp., Opis sp., Leptosolen sp.,Trigonia crenulifera, Exogyra flabellata ,Salenidia boulei, Pliotoxaster cf. lyonsi ,Epiaster whitei, Inoceramus sp.Assemblage- zones of the mentioned taxones and comparison of them with accompanied zones (foraminifers), age of studied sediments is Albian to Early Cenomanian.
