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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 *** 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 *** main facies are recognized and categorized in five facies groups:lagoon,shoal,rudist-biostrome,slope,and shallow open marine,deposited on a shelf carbonate *** 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 *** initial sedimentary characteristics in combination with distribution of diagenetic products play an important role in reservoir quality *** effect of diagenetic processes related to disconformities mainly depends on the facies nature below these ***-dominated facies of shoal and rudist debris,observed below the Cenomanian–Turonian disconformity,are mostly characterized by high dissolution and interconnected pore ***,depositional and diagenetic facies in the studied wells are correlated by petrophysical well log data,leading to distribution of the reservoir *** 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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Deformation, Stratigraphy, Structures and Shortening of the Zagros Fold-Thrust Belt in Southwest Iran Analysis by Restoration

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Acta Geologica Sinica(English Edition) 2015年第1期89卷 105-120页

作者： Ehsan BARZGAR iraj abdollahie fard Rasoul HAMIDZADEH MOGHADAM Emadoddin abdollahie KHALILI Aboozar GARAV Department of Mining Engineering Sahand University of Technology (SUT) Department of Petroleum Engineering Amirkabir University of Technology Department of Drilling Engineering Gubkin Russian State University of Oil and Gas

A structural cross-section constructed across the Zagros Fold-Thrust Belt covering the Abadan Plain, Dezful Embayment, and Izeh Zone applied 2D and 3D seismic data, well data, surface and subsurface geological maps, satellite images and field reconnaissance. Besides validation and modification of the cross-section, restoration allows better understanding of the geology, structural style and stratigraphy of the Zagros basin. In the area of interest, the Hormuz basal decollement and the Gachsaran detachment play the most significant roles in the structural style and deformation of the Zagros belt. More complexity is associated with interval decollements such as Triassic evaporites, Albian shales and Eocene marls. A variety of lithotectonic units and detachment surfaces confound any estimation of shortening, which generally decreases with increasing depth. Deformation completely differs in the Abadan Plain, Dezful Embayment and Izeh Zone because of different sedimentation histories and tectonic evolution; gentle and young structures can be interpreted as pre-collisional structures of the Dezful Embayment before the Late Cretaceous. After the Late Cretaceous, the Mountain Front Fault is the main control of sedimentation and deformation in the Zagros Basin, and this completely characterizes fold style and geometry within the Dezful Embayment and the Izeh Zone.

关键词： structural geology tectonics fold and thrust style restoration Iran

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Seismic geomorphology and stratigraphic trap analyses of the Lower Cretaceous siliciclastic reservoir in the Kopeh Dagh-Amu Darya Basin

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Petroleum Science 2019年第4期16卷 776-793页

作者： Gholamreza Hosseinyar Reza Moussavi-Harami iraj abdollahie fard Asadollah Mahboubi Rooholah Noemani Rad Department of Geology Faculty of ScienceFerdowsi University of MashhadMashhad 91775-1436Iran Geophysics Department NIOC Exploration DirectorateTehran 19395-6669Iran

Lower Cretaceous Shurijeh–Shatlyk Formations host some of the main reservoirs in the Kopeh Dagh-Amu Darya *** in this area so far has focused on the development of structural traps, but recognition of stratigraphic traps in this area is of increasing importance. Integration of 3D seismic data with borehole data from thirteen wells and five outcrop sections was used to identify potential reservoir intervals and survey the hydrocarbon trap types in the East Kopeh Dagh Foldbelt(NE Iran). Analyses of horizontal slices indicated that the lower Shurijeh was deposited in a braided fluvial ***, three types of channel were identified in the lower Shurijeh Formation: type 1, which is low-sinuosity channels interpreted to be filled with non-reservoir fine-grained facies;type 2, which is a moderately sinuous sand-filled channel with good prospectively;and type 3, which is narrow, high sinuosity channel filled with fine-grained sediments. Results indicate that upper Shurijeh–Shatlyk Formations were deposited in fluvial to delta and shallow marine environments. The identified delta forms the second reservoir zone in the Khangiran Field. Study of the stratigraphic aspects of the Shurijeh succession indicates that both lower and upper Shurijeh reservoirs are stratigraphic reservoir traps that improved during folding.

关键词： 3D seismic Fluvial Stratigraphic trap Cretaceous Kopeh Dagh Amu Darya

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