Integrated high-resolution chemostratigraphy and facies-based stratigraphic architecture of the Lower Cretaceous (Aptian), Shu’aiba Formation, Saudi Arabia

Al-Ghamdi, Nasser; Pope, Michael C.

doi:10.1306/05161311194

Cited by 16 publications

(5 citation statements)

References 26 publications

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“…They have developed within the relatively deep intrashelf basins (up to 100 m deep), during the highstands of sea-level. Afterwards, the basins were filled by prograding shallow marine facies during the sea-level lowstands (Yose et al, 2006;van Buchem et al, 2010;Al-Ghamdi and Pope, 2014).…”

Section: Regional Depositional Modelmentioning

confidence: 99%

“…These diagenetic processes are mainly concentrated in uppermost parts of the Dariyan Formation, just beneath a regional unconformity capping this unit. Seemingly, it has been formed during a long-term (up to 10 million years) phase of platform emersion and subaerial exposure at the Late Aptian (see Rameil et al, 2012;Al-Ghamdi and Pope, 2014).…”

Section: Meteoric Realmmentioning

confidence: 99%

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Geological reservoir characterization of the Lower Cretaceous Dariyan Formation (Shu'aiba equivalent) in the Persian Gulf, southern Iran

Mehrabi

Rhimpour-Bonab

Hajikazemi

et al. 2015

Marine and Petroleum Geology

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Section: Regional Depositional Modelmentioning

confidence: 99%

Section: Meteoric Realmmentioning

confidence: 99%

Geological reservoir characterization of the Lower Cretaceous Dariyan Formation (Shu'aiba equivalent) in the Persian Gulf, southern Iran

Mehrabi

Rhimpour-Bonab

Hajikazemi

et al. 2015

Marine and Petroleum Geology

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“…During this sequence, the sea‐level dropped and the Shu'aiba platform was exposed whilst sedimentation continued in the Bab Basin (Al‐Husseini & Matthews, 2010). Karstification and valley incision in the Shu'aiba Formation and downstepping of the sedimentary system along the Bab Basin margin, the latter coupled with a lithological change from organic‐rich carbonate mudstones to argillaceous organic‐poor mudstones, also marked the termination of the Aptian Supersequence in the region (Al‐Ghamdi & Read, 2010; Raven et al ., 2010; Maurer et al ., 2012).…”

Section: Discussionmentioning

confidence: 99%

“…The stratigraphic architecture of the Aptian Arabian carbonate platforms and intrashelf basins was mainly controlled by eustasy (e.g. Al‐Ghamdi & Read, 2010; Razin et al ., 2010; van Buchem et al ., 2010a,b; Maurer et al ., 2012). However, given the limited datasets used in this and previous studies (e.g.…”

Section: Discussionmentioning

confidence: 99%

Aptian Oceanic Anoxic Event 1a in the shallow, carbonate‐dominated intrashelf Kazhdumi Basin, Zagros Mountains

et al. 2023

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The early Aptian Selli Oceanic Anoxic Event 1a (ca 120 Ma) is a major Mesozoic episode of biotic, climatic, environmental and geochemical perturbations associated with the extensive burial of organic matter. Based on the new sedimentological, biostratigraphic and carbon‐isotope data from the Kazhdumi Intrashelf Basin, this study tracks the Oceanic Anoxic Event 1a‐associated perturbations along the north‐eastern margin of the Arabian Plate. The studied succession has five complete third‐order sequences with three facies associations: (i) deep open‐marine and intrashelf basin; (ii) shallow open‐marine mid‐ramp; and (iii) inner ramp. The Oceanic Anoxic Event 1a‐equivalent deposits include the former two facies associations – (i) and (ii) – and are 25 to 31 m thick, which corresponds to the accumulation rates of ca 1.9 to 3.1 cm kyr−1 (uncorrected for compaction) based on the 1.0 to 1.3 Myr duration of the event. The interval retained a high‐resolution record of carbon‐isotope and sea‐level fluctuations, which enables correlation across the Arabian Plate and Tethys. The Oceanic Anoxic Event 1a onset is marked by a biotic change from ostreid‐dominated shallow‐marine limestone with abundant foraminifera (Palorbitolina lenticularis and Choffatella decipiens) to dark grey deep‐water planktonic foraminifera‐rich and radiolaria‐rich limestone with chert and organic‐rich shale (Radiolarian Flood Zone). The upper oceanic anoxic event part of 1a is characterized by the shallowing‐upward, backstepping facies marking the return to a shallow open‐marine setting, albeit without recovery of the Palorbitolina–Choffatella association. Deep open‐marine deposition (Kazhdumi Tongue) was restored early during the Oceanic Anoxic Event 1a recovery in the latest early Aptian. A return to shallow open‐marine environments with Mesorbitolina‐rich limestone marks the beginning of the late Aptian, followed by a major sea‐level fall and karstification. This study resolves some of the uncertainties related to the order and timing of the events influencing the environmental disturbances across the eastern Arabian Plate during Oceanic Anoxic Event 1a and stresses the importance of shallow carbonate‐dominated intrashelf basins as faithful recorders of carbon‐isotope and sea‐level oscillations and palaeoenvironmental changes during global oceanic perturbations.

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“…10). The duration of the associated stratigraphic hiatus has been determined at nearly 2 Ma from biostratigraphic and strontium isotope data (Al-Ghamdi and Pope, 2014;Hosseini et al, 2016). However, the intrashelf basins began to be fi lled by -exposure surfaces (B, D).…”

Section: Discussionmentioning

confidence: 99%

Palaeo‐exposure Surfaces in the Aptian Dariyan Formation, Offshore Sw Iran: Geochemistry and Reservoir Implications

Mehrabi

Rahimpour‐Bonab

Al‐Aasm

et al. 2018

Journal of Petroleum Geology

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Palaeo‐exposure surfaces within and at the top of the carbonate‐dominated Aptian Dariyan Formation have been poorly studied in the Iranian sector of the Persian Gulf. This paper presents an integrated sedimentological and geochemical study of the Dariyan Formation at four oil and gas fields located in the western, central and eastern parts of the Gulf. Facies stacking patterns in general indicate shallowing‐upwards trends toward the exposure surfaces, which are interpreted to correspond to unconformities. The Dariyan Formation in the study area is divided into upper and lower carbonate units by a deep‐water, high‐gamma shale‐marl interval. At fields in the western and central Gulf, significant diagenetic changes were recorded in the top of the upper carbonate unit, including meteoric dissolution and cementation, brecciation and paleosol formation. An exposure surface is also present at the top of the lower carbonate unit in all the fields in the study area, and is associated with meteoric dissolution and cementation of grain‐dominated facies. Age calibration of studied intervals was carried out using microfossil assemblages including benthic and planktonic foraminifera. Negative excursions of both δ18O (−10‰ VPDB) and δ13C (−0.66‰ VPDB) were recorded in weathered intervals located below the unconformity surfaces. A sequence stratigraphic framework for the Dariyan Formation was established by integrating sedimentological, palaeontological and geochemical data. The δ13C curve for the formation in the Iranian sector of the Persian Gulf can be correlated with the reference curve for the northern Neotethys and used as a basis for regional stratigraphic correlation. Where the top‐Aptian unconformity is present, it has resulted in an enhancement of the reservoir characteristics of the underlying carbonate succession. Accordingly, the best reservoir zones in the Dariyan Formation occur in the upper parts of the lower and upper carbonate units which are bounded above by significant palaeo‐exposure surfaces.

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Integrated high-resolution chemostratigraphy and facies-based stratigraphic architecture of the Lower Cretaceous (Aptian), Shu’aiba Formation, Saudi Arabia

Cited by 16 publications

References 26 publications

Geological reservoir characterization of the Lower Cretaceous Dariyan Formation (Shu'aiba equivalent) in the Persian Gulf, southern Iran

Geological reservoir characterization of the Lower Cretaceous Dariyan Formation (Shu'aiba equivalent) in the Persian Gulf, southern Iran

Aptian Oceanic Anoxic Event 1a in the shallow, carbonate‐dominated intrashelf Kazhdumi Basin, Zagros Mountains

Palaeo‐exposure Surfaces in the Aptian Dariyan Formation, Offshore Sw Iran: Geochemistry and Reservoir Implications

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