Graptolites as fossil geo-thermometers and source material of hydrocarbons: An overview of four decades of progress
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F20%3A00523769" target="_blank" >RIV/61389005:_____/20:00523769 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.earscirev.2019.103000" target="_blank" >https://doi.org/10.1016/j.earscirev.2019.103000</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.earscirev.2019.103000" target="_blank" >10.1016/j.earscirev.2019.103000</a>
Alternative languages
Result language
angličtina
Original language name
Graptolites as fossil geo-thermometers and source material of hydrocarbons: An overview of four decades of progress
Original language description
The thermal maturity of lower Paleozoic graptolite-bearing marine sediments, which host many hydrocarbon deposits worldwide, has long been difficult to determine due to the absence of wood-derived vitrinite particles for conventional vitrinite reflectance. In 1976, graptolite reflectance was introduced as a new indicator for organic maturity of these deposits and has been used since in many regional studies. The majority of these studies, however, were done on a limited sample set and a limited range of thermal maturity, which resulted in a number of controversial views concerning the usefulness of graptolite reflectance as an alternative paleothermal indicator and its correlation with vitrinite reflectance through various proxies. In this paper, we review previous studies and combine those analyses with new data to assess the physical and chemical characteristics of graptolite periderm with increasing thermal maturity. We conclude that graptolite random reflectance (GR(or)) is a better parameter for the thermal maturity assessment than graptolite maximum reflectance (GR(omax)) due to the better quality of available data. Combining published data with results of our study of both natural and heat-treated graptolites and vitrinite, we present a new correlation between GFt(or) and equivalent vitrinite reflectance (EqVR(o)), as EqVR(o) = 0.99GR(or) + 0.08. Chemical composition of graptolite periderm is similar to vitrinite, graptolites are mainly kerogen Type II-III, are gas prone and have a substantial hydrocarbon potential. Lower Paleozoic graptolite-bearing organic-rich sediments are important shale gas source rocks and reservoirs globally and make a significant contribution to worldwide petroleum reserves.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
<a href="/en/project/EF16_019%2F0000728" target="_blank" >EF16_019/0000728: Ultra-trace isotope research in social and environmental studies using accelerator mass spectrometry</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Earth-Science Reviews
ISSN
0012-8252
e-ISSN
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Volume of the periodical
200
Issue of the periodical within the volume
1
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
28
Pages from-to
103000
UT code for WoS article
000514749100020
EID of the result in the Scopus database
2-s2.0-85074430454