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Coal petrology,sedimentology and depositional environment of the Parvadeh coais in the Upper Triassic,Tabas Block of Central-East Iran

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International Journal of Coal Science & Technology 2023年第3期10卷 58-77页

作者： Ziba Zamani hossain rahimpour-bonab Ralf Littke School of Geology College of ScienceUniversity of TehranTehranIran Energy and Mineral Resources(EMR) RWTH Aachen UniversityAachenGermany

Peat forming environment strongly influences the economic value of any coal seam and coal-bearing strata.Hence,pal-aeoenvironmental studies provide important information for coal resource exploration.In this context,detailed studies on selected coals from the Parvadeh Area,Iran,were conducted using sedimentology,coal petrology,X-ray diffraction(XRD),scanning electron microscopy-energy dispersive X-ray analyzer(SEM-EDX),and proximate analysis.The sedi-mentary facies above and below the coal seams are mainly marine or marine-influenced facies,supporting that the coal-forming mires in the Parvadeh Area developed in a paralic environment,where the base level must be closely related to sea level.Sulfur contents are moderate to high and mark the influence of brackish/marine water,especially during transgres-sion after peat growth in a lower delta plain environment.The peat-forming mires extended on coastal/delta plain lobes.The lower delta plain/coastal plain coals are characterized by lateral continuity and substantial thickness,whereas few coals possibly representing the upper delta plain are thin and more discontinuous.The detrital nature and composition of the numerous partings and the overall high ash yield in the coal seams indicate an active tectonic area with high rates of creation of accommodation space over peat growth.Coal petrology and coal facies analysis exhibits a permanently high water table within a forest swamp and mostly rheotrophic conditions,sometimes with connection to the seawater.Accord-ing to paleoenvironmental reconstructions,it seems that coal layers may be thicker,with less sulfur(pyrite),but more clastic minerals and partings toward the western part of the area.Although these coal seams presently have low economic potential for the mining operation,partly due to great depth,this humic,high-volatile to medium-volatile bituminous coal may be suitable for exploration of coal bed methane resources.

关键词： Coal petrology Sedimentology Coal facies analysis Upper Triassic Nayband Formation Tabas Block

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Integrated Rock Typing of the Grainstone Facies in a Sequence Framework：a Case from the Jurassic Arab Formation in the Persian Gulf

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Acta Geologica Sinica(English Edition) 2018年第4期92卷 1432-1450页

作者： Ali ASSADI hossain rahimpour-bonab Rahim KADKHODAIE-ILKHCHI Research Institute of Petroleum Industry (RIPI) Tehran Iran School of Geology College of Science University of Tehran Tehran Iran Department of Earth Science Faculty of Natural Science University of Tabriz Iran

The late Jurassic Arab Formation, a significant carbonate-evaporite reservoir rock in the Persian Gulf, is characterized by frequent grainstone facies. For rock type identification and reservoir characterization, core description, petrographic studies and pore system evaluation are integrated for Balal oil field in the Persian Gulf. The grainstone facies are developed into three shoal subenvironments on a carbonate ramp platform： leeward, central and seaward. Compaction, dissolution, cementation, anhydrite mineralization and dolomitization are the main diagenetic processes affecting the depositional pore system. Considering depositional and diagenetic features and pore types, the grainstones are classified into six rock types （RT 1 to RT6）. Rock types 1, 2 and 5 have large pore throat sizes with inter- granular and touching vug pore types. In rock type 3, moldic pores lead to high porosity and low permeability. Rock types 4 and 6 are cemented by anhydrite, calcite and dolomite. Generally, RTs 1, 2, 3 and 5 are related to late Transgressive systems tract （TST） and early Highstand systems tracts （HST） and show fair to good reservoir quality. In contrast, RTs 4 and 6 of late HST system tract show lower poroperm values, due to evaporite mineralization. Characterization of the grainstone facies provides a comprehensive understanding of the reservoir zones of the Arab Formation.

关键词： grainstone facies pore system rock type reservoir quality Arab Formation Kimmeridgian-Tithonian Iran

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Investigation of Microfacies—Electrofacies and Determination of Rock Types on the Aptian Dariyan Formation NW Persian Gulf

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Open Journal of Geology 2016年第1期6卷 58-78页

作者： Katayoon Rezaeeparto Hossein rahimpour bonab Ali Kadkhodaie Mehran Arian Elham Hajikazemi Department of Geology Science and Research Branch Islamic Azad University Tehran Iran Department of Geology Tehran University Tehran Iran Department of Geology Tabriz University Tabriz Iran Department of Geology Studies Offshore Oil Company Tehran Iran

Dariyan (Shuaiba) Formation is one of the main reservoir units in the Persian Gulf and South Western Iran. The microfacies and depositional environment of this formation is been investigated in the current study and influencing factors in reservoir characteristics have been discussed for Dariyan reservoir in the Soroush oil field. Facies analysis conducted on core and cutting samples indicated that Dariyan Formation is mainly deposited on a carbonate ramp setting with a shallow intra shelf basin. In addition, it has been demonstrated that facies changes reflect the main controls of the tectonic and climate (sea level fluctuations) during the deposition of these sediments. To determine the reservoir unites in this formation, 5 electrofacies were determined by neural network method that it is using different petrophysical logs (i.e. GR, PHIE and SWE). Using rock typing as the best way to establish an association between the various collected data (e.g. logs and cores) and geological descriptions 4 hydraulic flow units or rock types, determined on the basis of the Flow Zone Indicator (FZI) method in the Dariyan Formation of the Soroush field. Establishing a correlation between microfacies and rock types, the carbonate zones with moderate to good reservoir properties and also the intervals with the highest reservoir quality were determined.

关键词： Dariyan Formation Micro Facies Soroush Field Rock Types

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