Folding style of the Jarik Anticline, NE Dezful Embayment of Zagros Belt, the role of thickness changing of the folded layers and syntectonic deposition

lashgari, ahmad; Derikvand, Behzad

doi:10.1016/j.petrol.2020.106998

Cited by 6 publications

(2 citation statements)

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“…These studies were made possible in part by the availability of high-quality seismic lines in the Dezful embayment. They draw attention to: (i) the importance of subordinate detachment horizons in the Mesozoic succession which may locally decouple the fold structures (Ghanadian et al, 2017b;Derikvand et al, 2018;Sarkarinejad et al, 2018a); (ii) the mechanisms of the folding in the sedimentary cover, which is dominated by fault-bend and fault-propagation folds (Ghanadian et al, 2017a;Alipoor et al, 2019;Lashgari and Derikvand, 2020;Vatandoust et al, 2020); and (iii) pre-and syn-shortening diapirism of Gachsaran salt which in addition may have had a role as a decoupling horizon (Najafi et al, 2018;Heydarzadeh et al, 2020;Najafi and Lajmorak, 2020;.…”

Section: Gsmentioning

confidence: 99%

Structural Style and Timing of Nw‐se Trending Zagros Folds in Sw Iran: Interaction With North‐south Trending Arabian Folds and Implications for Petroleum Geology

Vergés,

Casini,

Ruh

et al. 2023

Journal of Petroleum Geology

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The Zagros foldbelt – foreland system in SW Iran is a prolific hydrocarbon province with known reserves of more than 90 billion brl of oil and 800 TCF of natural gas. Establishing the structural style of folding in the Zagros area presents a major challenge due both to the geographical extent of the foldbelt, which is some 1600 km long in total, and the presence of marked lateral variations in fold style related to the complex regional tectonic history. In addition, while numerous high‐quality structural studies of the Zagros have been completed over the last 20 years, they support a variety of different interpretations and are therefore $$difficult to synthesize. In this paper, we review the general structural style of the Zagros fold‐and‐thrust belt in SW Iran, and in particular the style of folding in the Lurestan arc, Dezful embayment, Izeh Zone and Fars arc. We summarise relationships between folding in these areas and fracture development, and investigate the timing of folding and the interaction between NW‐SE oriented “Zagros” folds and north‐south oriented “Arabian” folds. Finally, we briefly assess the implications of fold style for petroleum systems in the Zagros area. Although no new data are presented in this paper, a series of unpublished maps are used to illustrate the main results and include: a map showing the extent of the main detachment levels across the Lurestan, Dezful and Fars structural domains; two palaeotectonic maps (for Late Cretaceous – Paleocene and Miocene – Pliocene times, respectively), showing the position of the deformation fronts of the Zagros and the North Oman thrust systems and their potential spatial and temporal relationship with folding; and a set of four maps showing the distribution of reservoir rocks which are grouped by age into the Permian – Triassic Dehram Group, the Late Jurassic – Early Cretaceous Khami Group, the Late Cretaceous Bangestan Group, and the Oligocene – Miocene Asmari Formation. In addition, for the Lurestan, Dezful and Fars structural domains, a series of regional cross‐sections at the same scale are presented and discussed.Most of the data in this review paper were acquired in order to gain an improved understanding of the petroleum systems in the Zagros area; however the data are used here to investigate a range of interacting processes including tectonics, sediment deposition and subsurface fluid flow in the development of the fold‐and‐thrust belt and its associated foreland basins. The resulting synthesis is intended to provice a starting point for future tectonostratigraphic and hydrocarbon‐related studies which will make use of both existing and new multidisciplinary techniques to constrain the results. The knowledge acquired and the techniques used will be of benefit in future challenges including the identification of subsurface reservoirs suitable for the permanent storage of CO2 to mitigate the effects of climate change.

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Section: Gsmentioning

confidence: 99%

Structural Style and Timing of Nw‐se Trending Zagros Folds in Sw Iran: Interaction With North‐south Trending Arabian Folds and Implications for Petroleum Geology

Vergés,

Casini,

Ruh

et al. 2023

Journal of Petroleum Geology

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“…Recent studies of structures in the Dezful Embayment have in general focused on three topics: (i) the presence of subordinate detachment horizons in the Mesozoic succession that may locally decouple folded structures (Ghanadian et al, 2017b;Derikvand et al, 2018;Sarkarinejad et al, 2018); (ii) the mechanism of folding in the sedimentary cover, which appears to be dominated by fault-bend and fault-propagation fold geometries (Ghanadian et al, 2017a;Alipoor et al, 2019;Lashgari and Derikvand, 2020;Vatandoust et al, 2020); and (iii) the extent of pre-and synshortening passive diapirism of the Gachsaran (Lower Fars) salt in addition to its role in structural decoupling (Najafi et al, 2018;Heydarzadeh et al, 2020;Najafi and Lajmorak, 2020;Koyi and Mansurbeg, 2021). However in spite these studies, there has so far been little detailed investigation of the influence of major, deep-seated faults on the style of folding in the cover of the Dezful Embayment (Abdollahie Fard et al, 2006;Soleimany et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Structural Style in the South Dezful Embayment, Sw Iran: Combined Influence of the Zagros Frontal Fault System and the Detachment in the Miocene Gachsaran Formation

Tavakolian

Yassaghi

Najafi

2022

Journal of Petroleum Geology

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Structural decoupling in the Zagros fold‐and‐thrust belt, SW Iran, is controlled by the presence of intermediate detachment horizons within the Phanerozoic stratigraphic column such as intervals rich in evaporites. The effectiveness of the detachment horizons varies across the Zagros, and controls the style of folding and therefore the formation of structural traps. In this paper, field mapping, seismic interpretation and well data is used to investigate the complex structural style at six large‐scale anticlines located on either side of the surface trace of the NW‐SE trending Zagros Frontal Fault system in the South Dezful Embayment (Central Zagros). At some of these anticlines, lower – middle Miocene evaporites in the Gachsaran Formation decouple the folded overlying succession from the competent, underlying interval which includes the Asmari Formation reservoir. Anticlines to the northeast of the surface exposure of the fault have undergone four times more shortening than anticlines to the southwest. This localized shortening compared to regional values has resulted in some cases in complex asymmetric folding, and in severe structural decoupling above and below the Gachsaran Formation. However, other anticlines to the NE of the fault which underwent a similar amount of shortening, but in which the thickness of the Gachsaran Formation is reduced and the salt content is lower, show a harmonic style of folding above and below the formation. Thus, the efficiency of the Gachsaran detachment varies throughout the study area and appears to be controlled mainly by the total thickness of the formation, the net thickness of salt‐rich intervals within it, and the amount of structural shortening across the Zagros Frontal Fault system. These observations could be relevant to similar structural domains both in the Zagros and in other fold‐and‐thrust belts where intermediate detachment horizons and regional‐scale faults have together controlled the configuration of folds and structural traps.

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Tectonic and Morphotectonic Studies of Alluvial Fans

Pourmorad

Mohanty²

2022

Alluvial Fans in Southern Iran

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Folding style of the Jarik Anticline, NE Dezful Embayment of Zagros Belt, the role of thickness changing of the folded layers and syntectonic deposition

Cited by 6 publications

References 47 publications

Structural Style and Timing of Nw‐se Trending Zagros Folds in Sw Iran: Interaction With North‐south Trending Arabian Folds and Implications for Petroleum Geology

Structural Style and Timing of Nw‐se Trending Zagros Folds in Sw Iran: Interaction With North‐south Trending Arabian Folds and Implications for Petroleum Geology

Structural Style in the South Dezful Embayment, Sw Iran: Combined Influence of the Zagros Frontal Fault System and the Detachment in the Miocene Gachsaran Formation

Tectonic and Morphotectonic Studies of Alluvial Fans

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