Dolomite fluorescence Red/Green quotient: A potential new thermal maturity indicator

Ardakani, Omid H.; Sanei, Hamed

doi:10.1016/j.coal.2014.12.005

Cited by 4 publications

(2 citation statements)

References 23 publications

(33 reference statements)

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“…Much research was conducted to establish the EqVR o conversion equation using different thermal evolution parameters [20,[74][75][76]; however, these may not be applicable to the high-over-mature Wufeng-Longmaxi Formations in the Sichuan Basin. Luo et al [27] combined published data with their study results of both natural and heat-treated graptolites and vitrinite, and presented a conversion equation between GR or and EqVR o :…”

Section: The Relationships Between Raman Spectral Parameters and Gr Ormentioning

confidence: 99%

Characteristics and Differences Analysis for Thermal Evolution of Wufeng–Longmaxi Shale, Southern Sichuan Basin, SW China

et al. 2022

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The marine shale of the Upper Ordovician Wufeng Formation–Lower Silurian Longmaxi Formation is the main source rock and the target of shale gas exploration in the southern Sichuan Basin. The maturity of organic matter (OM) is a vital indicator for source rock evaluation. Due to the lack of vitrinite, the organic matter maturity of the Wufeng–Longmaxi Formations in the southern Sichuan Basin is difficult to accurately evaluate. In total, 33 core samples of the Wufeng–Longmaxi Formations in the southern Sichuan Basin were selected to observe the optical characteristics of solid bitumen and graptolites and measure their random reflectance. Simultaneously, Raman spectroscopic parameters of kerogen were also used to quantitatively analyze the change in maturity. By using Raman spectroscopic parameters as mediators, conversion equations between graptolite random reflectance (GRor) and equivalent vitrinite reflectance (EqVRo) were established. Taking the calculation results of EqVRo as constraints, the tectono-thermal evolution history of Wufeng–Longmaxi Shale in the southern Sichuan Basin is constructed through basin modelling. The results show that the maturity of Wufeng–Longmaxi Shale in the western Changning, Luzhou-western Chongqing, eastern Changning and Weiyuan areas decreases successively. The EqVRo falls in the ranges of 3.61%~3.91%, 2.92%~3.57%, 3.08%~3.25%, 2.41%~3.12%, and the average EqVRo is 3.73%, 3.30%, 3.18% and 2.80%, respectively. Thermal evolution in western Changning was controlled by the thermal effect of the Emeishan mantle plume and paleo-burial depth, while the thermal evolution of other areas was mainly controlled by paleo-burial depth. This study provides a reliable parameter for the evaluation of thermal maturity and makes a more accurate calibration of the maturity of the Wufeng–Longmaxi Formations in the southern Sichuan Basin; it also expounds the factors for the differences in thermal evolution in different parts of the area.

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Section: The Relationships Between Raman Spectral Parameters and Gr Ormentioning

confidence: 99%

Characteristics and Differences Analysis for Thermal Evolution of Wufeng–Longmaxi Shale, Southern Sichuan Basin, SW China

et al. 2022

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“…For the maturity determination in the Lower Palaeozoic shales, it is difficult and problematic because the 'gold standard' vitrinite (Hackley et al, 2015) is absent in such shale intervals. Other geochemical parameters, for example, Rock-Eval Tmax (Bertrand & Malo, 2001;Petersen et al, 2013), biomarker parameters (Radke & Welte, 1983), fluorescence photometry (Haeri-Ardakani & Sanei, 2015;Wilkins et al, 1995), the conodont colour alteration index (CAI; Epstein et al, 1977;Rejebian et al, 1987), and kerogen atomic ratio (H/C) (Buchardt & Lewan, 1990;Hartkopf-Fröder et al, 2015) are ineffective in such shales with over-maturity stage. Fortunately, the reflectances of solid bitumen and graptolite have been analysed in such kind of source rocks, and have been regarded as the effective indicator for maturity evaluation (Bertrand & Malo, 2001;Bustin et al, 1989;Luo et al, 2018;Petersen et al, 2013;Wang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Maturity and thermal evolution differences between two sets of Lower Palaeozoic shales and its significance for shale gas formation in south‐western Sichuan Basin, China

et al. 2021

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The Lower Cambrian Qiongzhusi shale and the Upper Ordovician-Lower Silurian Wufeng-Longmaxi shale are major source rocks and important shale gas exploration targets in the Sichuan Basin. Cutting and core samples from two shale gas wells in south-western Sichuan Basin have been selected for organic matter (OM) reflectance measurement and Raman spectra analysis with the aim to determine maturity. The results were incorporated for basin modelling to construct the thermal evolution of this area. Graptolite fragments and pyrobitumens are the dominant form of OM in

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Geochemistry of dolomite fluorescence in response to thermal maturity: An example from Upper Ordovician Utica Shale of southern Québec, Canada

Ardakani

Sanei

Jackson

et al. 2020

International Journal of Coal Geology

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Dolomite fluorescence Red/Green quotient: A potential new thermal maturity indicator

Cited by 4 publications

References 23 publications

Characteristics and Differences Analysis for Thermal Evolution of Wufeng–Longmaxi Shale, Southern Sichuan Basin, SW China

Characteristics and Differences Analysis for Thermal Evolution of Wufeng–Longmaxi Shale, Southern Sichuan Basin, SW China

Maturity and thermal evolution differences between two sets of Lower Palaeozoic shales and its significance for shale gas formation in south‐western Sichuan Basin, China

Geochemistry of dolomite fluorescence in response to thermal maturity: An example from Upper Ordovician Utica Shale of southern Québec, Canada

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