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Impacts of Depositional Facies and Diagenesis on Reservoir Quality:A Case Study from the Rudist-bearing sarvak formation,Abadan Plain,SW Iran

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Acta Geologica Sinica(English Edition) 2023年第1期97卷 190-206页

作者： Ali ASSADI Javad HONARMAND Seyed Ali MOALLEMI Iraj ABDOLLAHIE-FARD Geology Division Tehran Energy Consultants(TEC)TehranIran School of Earth Sciences Damghan UniversityDamghanIran Department of Petroleum Geology Research Institute of Petroleum Industry(RIPI)TehranIran National Iranian Oil Company Exploration Directorate(NIOC)TehranIran

An integrated geological-petrophysical analysis of the rudist-bearing sequence of the Cretaceous sarvak formation is given one giant oilfield,and provides an improved understanding of this main reservoir in the Abadan Plain,in the Zagros Basin,SW Iran.The main objective of this study is to evaluate reservoir potential of the sarvak formation,and then to utilize the calibrated well log signature to correlate reservoir potential in un-cored wells.Eight main facies are recognized and categorized in five facies groups:lagoon,shoal,rudist-biostrome,slope,and shallow open marine,deposited on a shelf carbonate platform.Given the distribution of diagenetic products and their effects on pore systems,three diagenetic facies namely,(DF-1)low dissolution and cementation;(DF-2);high dissolution;and(DF-3)high cementation are differentiated.The initial sedimentary characteristics in combination with distribution of diagenetic products play an important role in reservoir quality heterogeneity.The effect of diagenetic processes related to disconformities mainly depends on the facies nature below these surfaces.Grain-dominated facies of shoal and rudist debris,observed below the Cenomanian–Turonian disconformity,are mostly characterized by high dissolution and interconnected pore systems.Finally,depositional and diagenetic facies in the studied wells are correlated by petrophysical well log data,leading to distribution of the reservoir zones.Data obtained can be utilized for efficient reservoir characterization of the sarvak formation and its equivalent units in the Arabian Plate.

关键词： upstream petroleum facies diagenesis disconformity reservoir quality rudists sarvak formation Zagros Basin

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Biostratigraphy,Microfacies and Depositional Environment of the sarvak formation at the Pyun Anticline(Zagros Basin,Southwest of Iran)

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Acta Geologica Sinica(English Edition) 2021年第5期95卷 1647-1667页

作者： Mahtab DOUSTI MOHAJER Massih AFGHAH Mohammadsadegh DEHGHANIAN Seyed Jamal SHEIKH ZAKARIAII Department of Geology Science and Research BranchIslamic Azad UniversityTehranIran Department of Geology Shiraz BranchIslamic Azad UniversityShirazIran Department of Geology Bandar Abbas BranchIslamic Azad UniversityBandar AbbasIran

The sarvak formation is a carbonate sequence of Late Albian–Early Turonian age in Zagros Basin in Iran.In this investigation,the sarvak formation at the Pyun Anticline section(Izeh Zone)has been studied.It consists of 797 m thick limestone which overlies the Kazhdumi formation conformably and underlies the Gurpi formation unconformably at the Pyun Anticline.A very rich fossil association(85 genera and 132 species)characterizes the Pyun section.Based on the stratigraphic distribution of diagnosed foraminifera,five biozones are established:1,Muricohedbergella-Globigerinelloides sp.assemblage zone(Late Albian);2,Praealveolina iberica-Chrysalidina gradata interval zone(Early Cenomanian);3,Chrysalidina gradata-Cisalveolina fraasi(fallax)and C.lehneri interval zone(Middle Cenomanian);4,C.fraasi(fallax)and C.lehneri-Praetaberina bingistani assemblage zone(Late Cenomanian);5,Nezzazatinella picardi-MangashtiaDicyclina assemblage zone(Early Turonian).Based on the petrographic and sedimentological analyses,some 13 carbonate microfacies were identified.The investigated microfacies confirm a ramp-type paleoenvironment.These microfacies,from distal to proximal environments,consist of:MF1:planktonic foraminifera wackestone-packstone;MF2:Oligostegina planktonic foraminifera wackestone to packstone;MF3:planktonic-benthic foraminifers sponge spicules wackestonepackstone;MF4:rudist floatstone;MF5:rudist rudstone;MF6:bioclast intraclast grainstone;MF7:peloid intraclast grainstone;MF8:benthic foraminifers rudist grainstone-packstone;MF9:peloid bioclast grainstone-packstone;MF10:bioclast(benthic foraminifers)wackestone-packstone;MF11:peloid bioclast packstone;MF12:dacycladacea benthic foraminifera packstone-wackestone;MF13:miliolids wackestone-packstone.

关键词： sarvak formation biostratigraphy microfacies Pyun Izeh Zone Zagros Basin

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Sequence Stratigraphy and Sedimentary Environment of sarvak formation, in the Oil Field of Kuhmond (Southwest of Iran)

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Open Journal of Geology 2016年第10期6卷 1344-1360页

作者： Jafar Qomi Aveili Assistant Professor Islamic Azad University of Chalus Chalus Iran

sarvak formation is one of the important hydrocarbon reservoirs in the Zagros Basin that is one of the mid-Cretaceous carbonate units in Bangestan group. This formation is located in the Kazhdomi formation of the slope. Kuhmond oil field is in the southeast of Bushehr and in the north and northwestern of Fars province. In this study, sedimentology studies, stratigraphy and sedimentary environment in sarvak formation were studied. Based on studies, 18 main Microfacies were diagnosed in the region that have been deposited in four facies belts including open Sea, dam, lagoon and tidal zones. According to studies, the sedimentary environment of sarvak formation in Kohmond field was diagnosed as a ramp carbonate platform (Figure 1).

关键词： Sequence Stratigraphy and Sedimentary Environment sarvak formation Oil Field of Kuhmond

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Microfacies Patterns and Depositional Environments of the sarvak formation in the Abadan Plain, Southwest of Zagros, Iran

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Open Journal of Geology 2016年第3期6卷 201-209页

作者： Shahab Soleimani Asl Mohsen Aleali Department of Geology Science and Research Branch Islamic Azad University Tehran Iran

The sarvak formation is the second major oil-bearing reservoir in the south and south west of Iran. The Middle Cretaceous sarvak formation in the Zagros Mountains (Zagros Basin) is mainly composed of carbonate sequences. Based on facies studied, thirteen microfacies were recognized in the studied area, which were categorized in the three facies groups: including inner ramp, mid ramp and outer ramp. Evidences such as the gradual changes in the facies (basin slope), the absence of extensive uninterrupted barrier reef, the lack of calciturbidite and gravity sediments as well as the high proportion of grain-supported indicated that the sarvak formation was deposited in the ramp like depositional system, particularly on an inner ramp setting. Inner ramp facies group is the principal setting and subdivided to tidal flat, restricted and unrestricted lagoon as well as shoal sub-environments.

关键词： Microfacies Depositional Environments sarvak formation Zagros Iran

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Geochemical assessment of upper Cretaceous crude oils from the Iranian part of the Persian Gulf Basin:Implications for thermal maturity,potential source rocks,and depositional setting

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Petroleum Research 2023年第4期8卷 455-468页

作者： Faramarz Talaie Ali Kadkhodaie Mehran Arian Mohsen Aleali Department of Earth Sciences Faculty of Converging Science and TechnologiesScience and Research BranchIslamic Azad UniversityTehranIran Earth Sciences Department Faculty of Natural SciencesUniversity of TabrizTabrizIran

The Upper Cretaceous carbonate successions of the sarvak formation host giant oil reservoirs in the Persian Gulf.In this research,a total of 28 oil samples from nine oilfields located in the western,central and eastern parts of the Persian Gulf region were studied to determine the genetic relationships of oils,depositional setting of possible source rocks,thermal maturity,and source-rock ages in the Persian Gulf basin.According to the measured geochemical data,the source rocks facies vary from marine carbonates and marl/carbonates in the central and eastern oilfields to shale/carbonates in the western oilfields.The Pr/Ph ratio,steranes and terpanes suggest anoxic to dysoxic conditions of the depositional environments.The depositional environments experienced both low water stratification/low salinity and normal salinity/unstratified conditions.Evaluation of the saturated and aromatic biomarkers shows that all oil samples are mature and most of the source rocks lie within the beginning of the oil-generation window.The thermal maturity of the central oilfields is higher than that of the other samples,and has gone beyond the oil-generation stage.The C2s/C2g steranes ratio suggest that the central oilfelds of the Persian Gulf have Paleozoic and Jurassic source rocks,whereas the sarvak reservoir in other parts of this region is sourced from Cretaceous carbonate rocks.

关键词： Reservoir geochemistry Biomarkers Thermal maturity Redox conditions sarvak formation

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