Optical thermal maturity parameters and organic geochemical alteration at low grade diagenesis to anchimetamorphism: A review

Hartkopf‐Fröder, Christoph; Königshof, Peter; Littke, Ralf; Schwarzbauer, Jan

doi:10.1016/j.coal.2015.06.005

Cited by 153 publications

(52 citation statements)

References 318 publications

(344 reference statements)

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“…This may suggest that vitrinite reflectance is correlative with Tmax of Rock‐Eval pyrolysis. Tmax thermal maturity determinations are highly comparable to those obtained from measured vitrinite reflectance data (%Rm) as shown using large datasets of source rocks of different geological locations and ages, there is obviously very strong linear correlation (Hartkopf‐Fröder, Königshof, Littke, & Schwarzbauer, ; Teichmüller & Durand, ). Based on this correlation scheme, Tmax has been translated into equivalent vitrinite reflectance to constrain thermal history and hydrocarbon generation kinetics.…”

Section: Discussionsupporting

confidence: 63%

Thermal history of a Triassic sedimentary sequence verified by a multi‐method approach: Edgeøya, Svalbard, Norway

et al. 2018

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Temperature impacts the quality of reservoir and source rocks, thereby representing an important aspect of petroleum prospect assessments of any basin. This case study of the Triassic basin of Edgeøya, eastern Svalbard, reevaluate earlier burial estimates that were solely based on organic matter maturation data from organic rich shales. Here, we estimate temperatures using a multi‐method approach: Rock‐Eval pyrolysis parameters, fluid inclusions in diagenetic quartz, and inorganic diagenesis signatures of sandstones. Data were collected from organic rich shales of the Botneheia and Tschermakfjellet formations and coal bearing sandstones of the De Geerdalen Formation. Rock‐Eval pyrolysis data indicate that Botneheia and Tschermakfjellet formations experienced burial temperatures of about 124–138°C while the De Geerdalen Formation experienced temperatures ≥92°C. Homogenization temperatures of the De Geerdalen Formation sandstones give similar diagenetic temperatures, from 70 to 124°C, while the kaolinite to dickite transformation implies the temperatures >90°C. Furthermore, the absence of illite formation associated with kaolinite suggest that temperature have never exceed 130°C. Integrating various methods validate spatial variations in temperature proxies and constrain the thermal history of this basin. Cretaceous intrusions have locally affected the temperatures and have obscured regional subsidence and uplift trends. The effect of igneous intrusions on inorganic matter is very limited, but intensive on organic matter. These differences between organic and inorganic thermal indices help in distinguishing of magmatic from burial heating. This study has therefore relevance in deciphering the thermal history of sandstones experiencing magmatic activity coupled with multiple burial and uplift events.

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Section: Discussionsupporting

confidence: 63%

Thermal history of a Triassic sedimentary sequence verified by a multi‐method approach: Edgeøya, Svalbard, Norway

et al. 2018

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“…Bitumen and faunal reflectance is used widely to determine maturity in early Paleozoic sediments where vitrinite is either scarce or absent, and this technique has been applied to the Goldwyer Formation samples (Sherwood and Li, 2016). On the basis of conversions of bitumen reflectance to vitrinite reflectance from vitrinite reflectance from Hartkopf-Fröder et al (2015), the maceral reflectance indicate that Unit 4 is in the early stage of oil generation. The organic matter preserved in Units 1+2 at…”

Section: Organic Richness and Thermal Maturitymentioning

confidence: 99%

Environmental conditions and microbial community structure during the Great Ordovician Biodiversification Event; a multi-disciplinary study from the Canning Basin, Western Australia

Spaak

Edwards

Foster

et al. 2017

Global and Planetary Change

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“…Leiospheres and acritarchs change progressively in colour from light yellow and translucent, through pale yellow, yellow orange, orange, brown, to black. However, more recent studies reveal that leiospheres may follow a different colour maturity path to that of acritarchs (Hartkopf-Fröder et al 2015;Williams et al, 1998) with leiosphere colour changing more rapidly at lower temperatures than that of acritarchs (Duggan and Clayton, 2008;Dorning, 1986), probably due to differences in wall chemistry. The scale of Legall et al (1981) may therefore be more applicable to prasinophycean algae than to acritarchs.…”

Section: Acritarch Alteration Index (Aai)mentioning

confidence: 99%

Application of Palynomorph Darkness Index (PDI) to assess the thermal maturity of palynomorphs: A case study from North Africa

Spina

Vecoli

Riboulleau

et al. 2018

International Journal of Coal Geology

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This study focuses on the thermal maturity assessment of Silurian-Devonian sediments from the Ghadamis Basin, North Africa, comparing optical and geochemical analyses of palynomorphs. In southern Tunisia, the investigated subsurface cored section comprises the Argiles Principales Formation of Silurian age. In Libya, the succession studied covers the Awaynat Wanin III and IV formations, assigned to the Late Devonian (Frasnian-Famennian).Geochemical approaches used to reconstruct thermal alteration of sediments necessitate advanced, relatively expensive analytical techniques. In this study, the effectiveness of the less costly, relatively simple approaches of visually assessing palynomorph colour to determine thermal alteration (i.e., SCI: Spore Colour Index, TAI: Thermal Alteration Index and PDI: Palynomorph Darkness Index) was evaluated.SCI and TAI are qualitative methods, strictly related to the operator's perception, which use ten and five point scales respectively, to characterize colour in terms of illustrated specimens and/or descriptions. In contrast, PDI is obtained from the measurement of the red, green and blue (RGB) intensities of light transmitted through palynomorphs, using standard optical microscopes and digital cameras.The palynomorph-based thermal alteration estimates were compared to Rock-Eval pyrolysis data from the same samples. This calibration showed a linear relationship between these quantitative parameters and PDI. These results show that PDI is more reliable than the SCI and TAI methods.

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Optical thermal maturity parameters and organic geochemical alteration at low grade diagenesis to anchimetamorphism: A review

Cited by 153 publications

References 318 publications

Thermal history of a Triassic sedimentary sequence verified by a multi‐method approach: Edgeøya, Svalbard, Norway

Thermal history of a Triassic sedimentary sequence verified by a multi‐method approach: Edgeøya, Svalbard, Norway

Environmental conditions and microbial community structure during the Great Ordovician Biodiversification Event; a multi-disciplinary study from the Canning Basin, Western Australia

Application of Palynomorph Darkness Index (PDI) to assess the thermal maturity of palynomorphs: A case study from North Africa

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