Microstructure of graptolite periderm in Silurian gas shales of Northern Poland

Rafał Morga; Mirosława Pawlyta

doi:10.1016/j.coal.2018.02.012

Microstructure of graptolite periderm in Silurian gas shales of Northern Poland

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23 Citations (Scopus)

Abstract

Core samples of Silurian graptolite shales from an exploration borehole within the Baltic Basin were examined by optical microscopy, Raman spectroscopy and high resolution transmission electron microscopy. Graptolite periderm is composed of poorly ordered carbonaceous material of mainly aromatic structures. The dimension of the coherent domains is 1–2 nm. They are composed of two to three stacked layers. Raman spectral parameters of graptolite periderm are correlated with the mean random (R_r) and mean maximum (R_max) reflectance of graptolites. The spectral I_D1/I_G ratio predicts thermal maturity in a mean reflectance of graptolites (R_r) range between 1.30% and 1.80% (R_max ≈ 1.40–2.00%; Vitrinite Reflectance Equivalent VRE ≈ 1.10–1.50%). It is possible to calculate VRE_Raman from the I_D1/I_G ratio.

Original language	English
Pages (from-to)	1-7
Number of pages	7
Journal	International Journal of Coal Geology
Volume	189
DOIs	https://doi.org/10.1016/j.coal.2018.02.012
Publication status	Published - 15 Mar 2018

Keywords

Gas shales
Graptolites
HRTEM
Microstructure
Raman spectroscopy

ASJC Scopus subject areas

Fuel Technology
Geology
Economic Geology
Stratigraphy

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10.1016/j.coal.2018.02.012

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title = "Microstructure of graptolite periderm in Silurian gas shales of Northern Poland",

abstract = "Core samples of Silurian graptolite shales from an exploration borehole within the Baltic Basin were examined by optical microscopy, Raman spectroscopy and high resolution transmission electron microscopy. Graptolite periderm is composed of poorly ordered carbonaceous material of mainly aromatic structures. The dimension of the coherent domains is 1–2 nm. They are composed of two to three stacked layers. Raman spectral parameters of graptolite periderm are correlated with the mean random (Rr) and mean maximum (Rmax) reflectance of graptolites. The spectral ID1/IG ratio predicts thermal maturity in a mean reflectance of graptolites (Rr) range between 1.30\% and 1.80\% (Rmax ≈ 1.40–2.00\%; Vitrinite Reflectance Equivalent VRE ≈ 1.10–1.50\%). It is possible to calculate VRERaman from the ID1/IG ratio.",

keywords = "Gas shales, Graptolites, HRTEM, Microstructure, Raman spectroscopy",

author = "Rafa{\l} Morga and Miros{\l}awa Pawlyta",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2018",

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day = "15",

doi = "10.1016/j.coal.2018.02.012",

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TY - JOUR

T1 - Microstructure of graptolite periderm in Silurian gas shales of Northern Poland

AU - Morga, Rafał

AU - Pawlyta, Mirosława

PY - 2018/3/15

Y1 - 2018/3/15

N2 - Core samples of Silurian graptolite shales from an exploration borehole within the Baltic Basin were examined by optical microscopy, Raman spectroscopy and high resolution transmission electron microscopy. Graptolite periderm is composed of poorly ordered carbonaceous material of mainly aromatic structures. The dimension of the coherent domains is 1–2 nm. They are composed of two to three stacked layers. Raman spectral parameters of graptolite periderm are correlated with the mean random (Rr) and mean maximum (Rmax) reflectance of graptolites. The spectral ID1/IG ratio predicts thermal maturity in a mean reflectance of graptolites (Rr) range between 1.30% and 1.80% (Rmax ≈ 1.40–2.00%; Vitrinite Reflectance Equivalent VRE ≈ 1.10–1.50%). It is possible to calculate VRERaman from the ID1/IG ratio.

AB - Core samples of Silurian graptolite shales from an exploration borehole within the Baltic Basin were examined by optical microscopy, Raman spectroscopy and high resolution transmission electron microscopy. Graptolite periderm is composed of poorly ordered carbonaceous material of mainly aromatic structures. The dimension of the coherent domains is 1–2 nm. They are composed of two to three stacked layers. Raman spectral parameters of graptolite periderm are correlated with the mean random (Rr) and mean maximum (Rmax) reflectance of graptolites. The spectral ID1/IG ratio predicts thermal maturity in a mean reflectance of graptolites (Rr) range between 1.30% and 1.80% (Rmax ≈ 1.40–2.00%; Vitrinite Reflectance Equivalent VRE ≈ 1.10–1.50%). It is possible to calculate VRERaman from the ID1/IG ratio.

KW - Gas shales

KW - Graptolites

KW - HRTEM

KW - Microstructure

KW - Raman spectroscopy

UR - https://www.scopus.com/pages/publications/85044307219

U2 - 10.1016/j.coal.2018.02.012

DO - 10.1016/j.coal.2018.02.012

M3 - Article

AN - SCOPUS:85044307219

SN - 0166-5162

VL - 189

SP - 1

EP - 7

JO - International Journal of Coal Geology

JF - International Journal of Coal Geology

ER -

Microstructure of graptolite periderm in Silurian gas shales of Northern Poland

Abstract

Keywords

ASJC Scopus subject areas

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