Coral patch reef system and associated facies from southwestern Gondwana: paleoenvironmental evolution of the Oxfordian shallow-marine carbonate platform at Portada Covunco, Neuquén Basin, Argentina

Beresi, Matilde Sylvia; Cabaleri, Nora Graciela; Löser, Hannes; Armella, Claudia

doi:10.1007/s10347-016-0486-4

Cited by 9 publications

(3 citation statements)

References 54 publications

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“…Limestones (CaCO 3 ). Limestones constitute the largest amount of non-silicate sedimentary rocks (Abuseda et al, 2015;Cook et al, 2006;Adebayo et al, 2017;Beresi et al, 2016). These rocks in the caprock of Gachsaran oil field are classified as mudstone, wackstone and packstone according to the Dunham's classification (1962).…”

Section: Petrological Analysismentioning

confidence: 99%

Determination of Key Beds from the Cap Rocks of Oil Reservoirs Using a Novel Method, Case Study: The Gachsaran Formation, Southwest Iran

Pourmorad¹,

Jokar²,

Jahan³

2021

Lithol Miner Resour

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The use of key beds in the cap rocks of the oil reservoirs is crucial. Lack of awareness of these key beds will have serious risks and damages. The Gachsaran oil field is located 220 km southwest of Ahwaz-Iran. The former caprock consists of six key beds (A, B, C, D, E, and F). At the time of writing this paper these key beds are being used during excavations and drilling to determine the site of casing points. What has made utilizing these key beds during excavations difficult however, is use of diamond drill bits which results in the shattering of excavated samples. As such, it has become challenging to learn more about these key beds through studying petrographic thin sections in microscopy. These key beds were observed during the investigation at the drill sites. Later, the excavated samples were studied in the Energy-Dispersive X-ray Spectroscopy (EDS) machine, using a semi-quantitative method to analyze the elemental differences in those key beds. In addition to the identification of various lithological and diagenetic properties of the caprock, this study leads to the introduction of four new key beds based on geochemical properties. Some of the most important differences within the formation include those between the caprock anhydrite and the non-caprock anhydrite, namely the presence of potassium and titanium and the absence of chlorine and sodium in the caprock section. The four new key beds introduced from this study using elemental differences were named as key beds-1, 2, 3, and 4.

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Section: Petrological Analysismentioning

confidence: 99%

Determination of Key Beds from the Cap Rocks of Oil Reservoirs Using a Novel Method, Case Study: The Gachsaran Formation, Southwest Iran

Pourmorad¹,

Jokar²,

Jahan³

2021

Lithol Miner Resour

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“…Mohmmadi et al (2011) believed that these corals were related to lagoonal patch reefs. Riegl et al (2010) and Beresi et al (2016) showed that patch reefs were abundant in lagoonal environments with high levels of salinity and influx of siliciclastics. A similar microfacies was reported for the Qom Formation to the south of Kashan (Mohammadi et al, 2011), 27 km from the city of Qom (Seddighi et al, 2011) and by Amirshahkarami et al (2007) from the Asmari Formation.…”

Section: Microfacies Interpretation and Distribution On Platformmentioning

confidence: 99%

Reconstruction of the depositional sedimentary environment of Oligocene deposits (Qom Formation) in the Qom Basin (northern Tethyan seaway), Iran

et al. 2020

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During the Rupelian–Chattian, the Qom Basin (northern seaway basin) was located between the Paratethys in the north and the southern Tethyan seaway in the south. The Oligocene deposits (Qom Formation) in the Qom Basin have been interpreted for a reconstruction of environmental conditions during deposition, as well as of the influence of local fault activities and global sea level changes expressed within the basin. We have also investigated connections between the Qom Basin and adjacent basins. Seven microfacies types have been distinguished in the former. These microfacies formed within three major depositional environments, i.e., restricted lagoon, open lagoon and open marine. Strata of the Qom Formation are suggested to have been formed in an open-shelf system. In addition, the deepening and shallowing patterns noted within the microfacies suggest the presence of three third-order sequences in the Bijegan area and two third-order depositional sequences and an incomplete depositional sequence in the Naragh area. Our analysis suggests that, during the Rupelian and Chattian stages, the depositional sequences of the Qom Basin were influenced primarily by local tectonics, while global sea level changes had a greater impact on the southern Tethyan seaway and Paratethys basins. The depositional basins of the Tethyan seaway (southern Tethyan seaway, Paratethys Basin and Qom Basin) were probably related during the Burdigalian to Langhian and early Serravallian.

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“…Jurassic reefs include detailed ecological studies such as coral zonations (Lathuilière et al 2005, Rusciadelli et al 2011, Martin-Garin et al 2012, Ricci et al 2018b, community replacements (Werner et al 1994, Insalaco 1996, Pawellek & Aigner 2003, Matyszkiewicz et al 2006, Beresi et al 2017, San Miguel et al 2017, or putative ecological successions (Bill et al 2011, Olivier et al 2012. Moreover, Late Jurassic coral reefs also appear to have been affected by global climate change on a scale of a few million years, recording phases of latitudinal migrations (Cecca et al 2005, Martin-Garin et al 2012.…”

mentioning

confidence: 99%

Distribution of coral-microbialite reefs along the French Jura platform during the Bimammatum Zone (Oxfordian, Late Jurassic)

Olivier¹

2019

Bull. Geosci.

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In the Late Jurassic, carbonate platforms and reefs were widespread in the various known geographical realms, north Tethysian, south Tethysian, north Atlantic, and Pacific (Leinfelder 2001). The many studies conducted by R. Leinfelderʼs German team during the 1990s have shown that these reefs were diversified and occupied specific ecological niches: stromatolites near the shore line, coral reefs in relatively shallow and proximal zones, siliceous sponge bioherms in deeper and distal parts of the platform, and microbial mounds in deep epicontinental

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Coral patch reef system and associated facies from southwestern Gondwana: paleoenvironmental evolution of the Oxfordian shallow-marine carbonate platform at Portada Covunco, Neuquén Basin, Argentina

Cited by 9 publications

References 54 publications

Determination of Key Beds from the Cap Rocks of Oil Reservoirs Using a Novel Method, Case Study: The Gachsaran Formation, Southwest Iran

Determination of Key Beds from the Cap Rocks of Oil Reservoirs Using a Novel Method, Case Study: The Gachsaran Formation, Southwest Iran

Reconstruction of the depositional sedimentary environment of Oligocene deposits (Qom Formation) in the Qom Basin (northern Tethyan seaway), Iran

Distribution of coral-microbialite reefs along the French Jura platform during the Bimammatum Zone (Oxfordian, Late Jurassic)

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