Geochemical, petrographical, and petrophysical evaluations of a heterogeneous, stratiform dolomite from a Barremian oil field, offshore Abu Dhabi (United Arab Emirates)

Yamamoto, Kiyohiko; Ottinger, Gary; Zinati, Osama Al; Takayanagi, Hideko; Yamamoto, Koshi; Iryu, Yasufumi

doi:10.1306/0327171524717016

Cited by 10 publications

(3 citation statements)

References 67 publications

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“…In the offshore Arabian Gulf, packstone to wackestone and finely crystalline dolomite layers were collected from the free-water level reservoir zone in the Barremian-Aptian, Kharaib Formation. The detailed facies description in this interval can be found in [64] and the palaeo-environmental interpretation of this interval can be found in Van Buchem et al [44] and Yamamoto et al [65]. The dolomite in this formation is most abundant in the lower two-thirds of the interval [66].…”

Section: Methodsmentioning

confidence: 79%

Clumped Isotope Reordering and Kinetic Differences in Co-Hosted Calcite and Dolomite Minerals throughout Burial Diagenesis and Exhumation

Adlan,

Kaczmarek,

John

2023

Minerals

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The clumped isotope paleo-thermometer has become a valuable proxy for the burial history reconstruction of carbonate formations. To maximise the accuracy of these reconstructions, post-depositional alterations, such as recrystallisation and Δ47 isotope exchange reactions, must be understood. In this study, we examine the isotopic behaviour of calcites and early dolomite samples from the same stratigraphic intervals, and thus with similar burial history. This approach provides additional constraints on the kinetics of Δ47 reordering in dolomite during exhumation. Clumped isotope measurements were performed on 19 calcites and 15 early dolomites from the Permian, Jurassic, and Cretaceous periods from four locations in Oman spanning different burial regimes. The calcite and dolomite samples were collected from the rock matrix, based on the assumption that fine material was more susceptible to recrystallisation. Our results show that calcites and dolomites record different Δ47 values despite being subjected to the same thermal history. The maximum Δ47 temperature recorded in dolomites (181 ± 13 °C) corresponds to the oldest and most deeply buried Permian rock. This value is approximately 35 °C higher than those measured in the co-located and coeval calcite matrix (145 ± 14 °C). This discrepancy suggests that calcite and dolomite have different kinetic parameters. Our data confirm (1) that dolomite Δ47 values are more resistant to alteration during burial and exhumation than Δ47 calcite values, and (2) that dolomite has a higher Δ47 closing temperature than calcite during cooling. The presence of two mineral phases with distinct kinetic parameters in the same stratigraphic unit provides additional constraints on models of burial and uplift. In addition, mineralogical data coupled with Δ47 and burial depths suggest that the progressive development of dolomite cation ordering is driven by temperature elevation, as previously suggested.

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Section: Methodsmentioning

confidence: 79%

Clumped Isotope Reordering and Kinetic Differences in Co-Hosted Calcite and Dolomite Minerals throughout Burial Diagenesis and Exhumation

Adlan,

Kaczmarek,

John

2023

Minerals

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“…The formation of the early-diagenetic dolomite may be related to tidal pumping and the diffusion of Mg 2+ ions from seawater in a tidal flat or open-marine setting and is controlled by the permeability of the precursor mud-dominated lithofacies (cf. Yamamoto et al,2018).…”

Section: Conditions During Eogenesismentioning

confidence: 99%

“…These sediments show evidence of pre-transgression diagenetic alteration such as the presence of a karstic surface covered by ferruginous material in the Kuhe-Fahliyan anticline (Keyvani et al,2007;Hosseini et al, 2016) at the Valanginian-Hauterivian sequence boundary. It is likely that submergence resulted in dolomitization of the transgressive bioturbated silty marls and argillaceous limestones and was enhanced by the long residence time at the seafloor (Kordi et al, 2017;Yamamoto et al, 2018). Bioturbation may have played a substantial role in dolomitization as a result of the creation of local biogeochemical environments with relatively high concentrations of organic matter (Ye et al, 2021).…”

Section: Conditions During Eogenesismentioning

confidence: 99%

Pre‐, Syn‐ and Post‐tectonic Diagenetic Evolution of a Carbonate Reservoir: A Case Study of the Lower Cretaceous Fahliyan Formation in the Dezful Embayment, Zagros Foldbelt, Sw Iran

Keyvani,

Al‐Aasm,

Mansurbeg

et al. 2023

Journal of Petroleum Geology

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Lower Cretaceous carbonates of the Fahliyan Formation form prolific reservoir rocks at oilfields in the Dezful Embayment, central Zagros fold‐thrust belt, SW Iran. The carbonates have undergone significant diagenetic alteration in phases which can in general be linked to the pre‐, syn‐ and post‐tectonic evolution of the fold‐thrust belt. This paper investigates the impact of diagenetic processes on the reservoir quality of the carbonates using integrated petrographic, geochemical and sedimentological analyses of subsurface and outcrop samples of the formation. Diagenetic alterations include:(i) pre‐tectonic eogenesis in the marine and shallow‐burial realm, which resulted in micritization of allochems and cementation by equant and isopachous calcite rims and framboidal pyrite together with limited dolomitization and dissolution of metastable bioclasts. The isotopic compositions of micrite and early calcite cement depart from postulated values of Lower Cretaceous marine carbonates, signifying early stabilization of precursor metastable carbonate minerals and the possible effects of the incursion of meteoric waters and/or increasing burial temperatures;(ii) mesogenesis during the subsequent syn‐tectonic phase, which included Late Cretaceous ophiolite obduction at the northern margin of the Arabian Plate and the later Zagros orogeny in the Miocene‐Pliocene. Diagenetic modifications included the emplacement of hydrocarbons, the development of stylolites and fractures, and the precipitation of saddle dolomite, replacive rhombic dolomite, discrete pyrite, microcrystalline quartz, kaolin and anhydrite. The average stable isotope compositions of saddle dolomite (δ18O: ‐6.9 ‰ ± .9 and δ13C 0.5 ‰ ± 1.6, respectively) also reflects the influence of high temprature basinal fluids;and (iii) “late” (telogenetic, post‐tectonic) uplift‐related modification starting in the Pliocene, when the incursion of meteoric waters resulted in the formation of vugs, the calcitization of dolomite, and cementation by fracture‐filling blocky calcite. The negative δ18O and δ13C stable isotope values (average: ‐5.5 ‰ ± 1.5; and ‐3.6 ‰ ± 5.9, respectively) of late blocky calcite cement suggest the incursion of meteoric water into the system.This study demonstrates that diagenetic processes in carbonates in the Fahliyan Formation, which exerted a significant control on the distribution of secondary porosity, can be related to the tectonic evolution of the central Zagros fold‐thrust belt. Thus, constraining the diagenetic history of carbonate successions within the context of their wider tectonic evolution is important for the prediction of the spatial and temporal distribution of reservoir quality.

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Geochemical constrains on dolomitization pathways of the Upper Jurassic carbonate rocks in the Geneva Basin (Switzerland and France)

Makhloufi

Samankassou

2019

Swiss J Geosci

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Geochemical, petrographical, and petrophysical evaluations of a heterogeneous, stratiform dolomite from a Barremian oil field, offshore Abu Dhabi (United Arab Emirates)

Cited by 10 publications

References 67 publications

Clumped Isotope Reordering and Kinetic Differences in Co-Hosted Calcite and Dolomite Minerals throughout Burial Diagenesis and Exhumation

Clumped Isotope Reordering and Kinetic Differences in Co-Hosted Calcite and Dolomite Minerals throughout Burial Diagenesis and Exhumation

Pre‐, Syn‐ and Post‐tectonic Diagenetic Evolution of a Carbonate Reservoir: A Case Study of the Lower Cretaceous Fahliyan Formation in the Dezful Embayment, Zagros Foldbelt, Sw Iran

Geochemical constrains on dolomitization pathways of the Upper Jurassic carbonate rocks in the Geneva Basin (Switzerland and France)

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