Application of fluorescent light microscopy to enhanced microfacies analysis of Jurassic carbonate rocks, SE Bohemian Massif

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F20%3A00000417" target="_blank" >RIV/00025798:_____/20:00000417 - isvavai.cz</a>

Výsledek na webu

<a href="https://journals.muni.cz/gvms/article/viewFile/12399/11740" target="_blank" >https://journals.muni.cz/gvms/article/viewFile/12399/11740</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5817/GVMS2020-12399" target="_blank" >10.5817/GVMS2020-12399</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Application of fluorescent light microscopy to enhanced microfacies analysis of Jurassic carbonate rocks, SE Bohemian Massif

Popis výsledku v původním jazyce

Upper Jurassic limestones and dolomites of the Vranovice Formation occur on the southeasternslopes of the Bohemian Massif below the Western Carpathian thrust belt. Theyrepresent a special type of reservoir rocks in the potential geothermal systems and exhibithighly variable porosity, permeability, and flow mechanisms due to different type of diagenesisand pervasive dolomitization. Fluorescence and translucent light microscopy was usedfor more detailed petrographic analysis of Vranovice limestones and dolomites. Isopachous,syntaxial and dolomitic cements were distinguished along with fossils recrystallization. Twogenerations of dolomite were identified – replacement dolomite and zonal cementationdolomite, what suggests a number of changes in the formation water chemistry during thedolomitization process. Extent of the observed dolomitization is inversely related to theporosity of the Jurassic rocks. Postdiagenetic generation of fissures cutting the strata dueto tectonic deformation is documented by bright fluorescent color. In the studied samplesof Vranovice limestones and dolomites the fissures represent the most important migrationpathways, more than pore throats themselves. Further genetic information on petroleummigration is interpreted from intercrystalline porosity filled with precipitated solid bitumen.Present results provide basis for further investigations in pore-water-rock interactions andchanges in chemical conditions during diagenesis.

Název v anglickém jazyce

Application of fluorescent light microscopy to enhanced microfacies analysis of Jurassic carbonate rocks, SE Bohemian Massif

Popis výsledku anglicky

Upper Jurassic limestones and dolomites of the Vranovice Formation occur on the southeasternslopes of the Bohemian Massif below the Western Carpathian thrust belt. Theyrepresent a special type of reservoir rocks in the potential geothermal systems and exhibithighly variable porosity, permeability, and flow mechanisms due to different type of diagenesisand pervasive dolomitization. Fluorescence and translucent light microscopy was usedfor more detailed petrographic analysis of Vranovice limestones and dolomites. Isopachous,syntaxial and dolomitic cements were distinguished along with fossils recrystallization. Twogenerations of dolomite were identified – replacement dolomite and zonal cementationdolomite, what suggests a number of changes in the formation water chemistry during thedolomitization process. Extent of the observed dolomitization is inversely related to theporosity of the Jurassic rocks. Postdiagenetic generation of fissures cutting the strata dueto tectonic deformation is documented by bright fluorescent color. In the studied samplesof Vranovice limestones and dolomites the fissures represent the most important migrationpathways, more than pore throats themselves. Further genetic information on petroleummigration is interpreted from intercrystalline porosity filled with precipitated solid bitumen.Present results provide basis for further investigations in pore-water-rock interactions andchanges in chemical conditions during diagenesis.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Geologické výzkumy na Moravě a ve Slezsku

ISSN

1212-6209

e-ISSN

—

Svazek periodika

27

Číslo periodika v rámci svazku

1-2

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

5

Strana od-do

106-110

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-85103329048