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Wyszukujesz frazę "coalification" wg kryterium: Temat


Wyświetlanie 1-6 z 6
Tytuł:
Coal clasts in the Bolsovian (Westphalian C) sequence of the Kladno-Rakovník Continental Basin (Czech Republic): implications for the timing of maturation
Autorzy:
Daněk, V.
Pešek, J.
Valterová, P.
Powiązania:
https://bibliotekanauki.pl/articles/1204924.pdf
Data publikacji:
2002
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
coal clasts
time span of coalification
Bolsovian
Opis:
Angular coal clasts confined to coarse-grained feldspathic sandstone deposited in the Tuchlovice Mine pit in the Kladno-Rakovník basin were studied. These fragments of various orientation consisting of banded, dull and bright coal of Bolsovian age (=Westphalian C) occur as an admixture being some tenths of a millimetre up to 40x30x20 mm large. The clasts are coalified into high volatile bituminous coal showing an average reflectance corresponding to vitrinite (Rr = 0.64%). They reveal no signs of progressing diagenetic changes after their redeposition. Some clasts exhibit cracks filled with clay minerals, which constitute common admixture in coal seams of this basin. Cracks do not extend into the adjacent sediment. Their origin is connected with coalification processes in original coal seam, which occurred prior to erosion. The investigation of miospores showed that the coal clasts come from the eroded Lubná coal seams of Bolsovian age. Since the Radnice Member is the oldest unit of the central and west Bohemian basins, the coalification of organic matter into high volatile bituminous coal must have occurred within this member, i.e., during some hundred thousand years at a depth of only a few tens, maximum first hundred metres. The achieved results argue for a high paleotemperature gradient, which must have existed during the Carboniferous in the Bohemian Massif.Similar conditions are known, e.g., from South Wales basin in UK (Gayer et al., 1996) and from the Upper Silesian basin (Kožušníková et al., 1999).
Źródło:
Polish Geological Institute Special Papers; 2002, 7; 63-78
1507-9791
Pojawia się w:
Polish Geological Institute Special Papers
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coalification as a process determining the methane adsorption ability of coal seams
Autorzy:
Dutka, Barbara
Godyń, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1853877.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metan
petrografia
adsorpcja
coal bed methane
degree of coalification
petrography
adsorption capacity
Opis:
The paper presents the results of a study of methane adsorption on coal samples with various degrees of metamorphism, coming from the Polish and Czech parts of the Upper Silesian Coal Basin (USCB). The range of coalification of the samples was from bituminous with vitrinite reflectance Ro equal to about 0.5% to para-anthracite coals with Ro equal to over 2%. The methane adsorption capacity was determined at the temperature 303 K for each of the studied coal seams. Methane adsorption isotherms were approximated using the Langmuir model. The relationship between the Langmuir isotherm parameters (am and PL) and the degree of coalification was presented. It was shown that the degree of coalification of the coal substance affects the adsorption ability of coal with respect to methane and determines the value of the Langmuir isotherm parameters. The study was conducted in order to present the distribution of adsorption capacity of Upper Silesian coals in relation to improving work safety in active mines as well as designing technologies that use coal bed methane (CBM) from balance and off-balance resources.
Źródło:
Archives of Mining Sciences; 2021, 66, 2; 181-195
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coalification degree of the No. 116/2 seam in the Janina coal mine (Upper Silesian Coal Basin) based on vitrinite reflectance
Ocena stopnia uwęglenia pokładu 116/2 w kopalni Janina (Górnośląskie Zagłębie Węglowe) na podstawie refleksyjności witrynitu
Autorzy:
Misiak, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/29278276.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
coal seam
vitrinite reflectance
coalification degree
pokład węgla
refleksyjność witrynitu
stopień uwęglenia
Opis:
The subject of the study was the No. 116/2 coal seam belonging to the Cracow Sandstone Series of the Upper Silesian Coal Basin. Reflectograms of the samples taking into account all the vitrinite group macerals present in the coal were recorded for ΔRo close to the standard deviation and in the standard range. A careful analysis of vitrinite reflectograms reveals the presence of three or four clearly distinguished peaks. When assessing the rank of coal, only the main maximum, peak No. 4, was considered to be significant. Measurements of the average reflectance of collotelinite were made only on the vitrinite surfaces with a thickness of more than 1 mm. Only two maxima were revealed on detailed reflectograms. These maxima correlate with the peaks marked as No. 3 and 4 in the sample reflectograms taking into account all the vitrinite group macerals. The Cdaf content in the tested coal from the Janina coal mine is between 75.9 and 77.5 wt%, while for vitrain, it ranges from 71.1 to 75.5 wt%. This relationship is an exponential regression with a correlation coefficient of r = 0.95h and can be approximated by a linear correlation of r = 0.94. The correlation strength between the volatile matter content and the coefficient of average reflectance in the vitrinite of the tested coal was also examined. The statistically significant correlation is strong, which is expressed by the exponential correlation coefficient “r” being close to 0.99 and its linear approximation with the correlation coefficient r = 0.98. However, no correlation was found between the measured reflectance values and the GI coefficient calculated for the examined samples.
Przedmiotem badań był pokład węgla 116/2 należący do krakowskiej serii piaskowcowej Górnośląskiego Zagłębia Węglowego. Reflektogramy próbek uwzględniające wszystkie występujące w węglu macerały grupy witrynitu, zarejestrowano w postaci reflektogramów przy stadium ΔRo zbliżonego do odchylenia standardowego oraz w zakresie standardowym. Reflektogramy witrynitu dokładniej rejestrowane ujawniają obecność 3 lub 4 wyraźnie wyodrębnionych pików. Znaczenie w ocenie stopnia uwęglenia badanego węgla przypisano wyłącznie głównemu maksimum – pik nr 4. Wykonano także pomiary średniej refleksyjności kolotelinitu wyłącznie na powierzchniach warstewek witrynu o grubości większej od 1 mm. Na szczegółowych reflektogramach ujawniły się jedynie 2 maksima. Maksima te korelują z pikami oznaczonymi jako nr 3 i 4 w reflektogramach próbek uwzględniający wszystkie macerały grupy witrynitu. Zawartość pierwiastka Cdaf w badanym węglu z KWK Janina zmienia się w przedziale od 75,9 do 77,5 %wt, natomiast w witrynie od 71,1 do 75,5 %wt. Zależność ta ma charakter regresji o charakterze wykładniczym o współczynniku korelacji r = 0,95, która może być przybliżona korelacją liniową o r = 0,94. Zbadano również siłę korelacyjną między zawartością części lotnych a współczynnikiem średniej refleksyjności w witrynitu badanego węgla. Statystycznie istotna korelacja jest silna, co wyraża współczynnik korelacji wykładniczej „r” bliski wartości 0,99 i liniowe jej przybliżenie o wartości współczynnika korelacji r = 0,98. Nie stwierdzono natomiast korelacji pomiędzy pomierzonymi wartościami refleksyjności a współczynnikiem GI obliczonym dla badanych próbek.
Źródło:
Gospodarka Surowcami Mineralnymi; 2023, 39, 4; 123--140
0860-0953
Pojawia się w:
Gospodarka Surowcami Mineralnymi
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrothermal fluids influence on the thermal evolution of the Stephanian sequence, the Sabero Coalfield (NW Spain)
Autorzy:
Botor, D.
Powiązania:
https://bibliotekanauki.pl/articles/184440.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Spain
Cantabrian Mountains
Sabero coalfield
Carboniferous
pull-apart basin
coalification
thermal history
maturity modelling
vitrinite reflectance
eroded overburden
Opis:
In the present study, the thermal history of the Late Carboniferous (Stephanian) coal-bearing sediments of the Sabero Coalfield has been reconstructed in order to elucidate coal rank. The Sabero Coalfield is located in a small intramontane coal-bearing basin along the Sabero-Gordón fault zone, one of the major E-W trending strike-slip fault systems of the southern part of the Cantabrian Zone (NW Spain). The total thickness of the Stephanian succession is in excess of 2,000 m, and is composed of siliclastic rocks and intercalated coal seams with tonsteins. Mean vitrinite reflectance values in the Stephanian rocks in the Sabero Coalfield are in the range from 0.61 to 3.14% Rr, but most values are in the range from 0.8 to 1.5% Rr (based on 84 samples). Average vitrinite reflectance gradient is high (0.73% Rr/km), which suggests high value of average paleogeothermal gradient (52°C/km). The maximum paleotemperatures calculated from vitrinite reflectance values for the Stephanian rocks range between 89°C (top of the Stephanian) and 195°C (bottom of the Stephanian). Coalification of the organic matter in the Stephanian rocks was achieved in the Early Permian, and was most likely related to several almost simultaneous related to magmatic and hydrothermal activity during high subsidence period in the pull-apart basin. The primary, burial-related maturity pattern, was probably slightly overprinted by fluid migration event, which is supposed to have occurred in Early Permian time.
Źródło:
Geology, Geophysics and Environment; 2012, 38, 4; 369-393
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal history of the Carboniferous strata in the northern part of the Intra-Sudetic Basin (SW Poland): A combined Raman spectroscopy and organic petrography study
Autorzy:
Botor, Dariusz
Toboła, Tomasz
Waliczek, Marta
Powiązania:
https://bibliotekanauki.pl/articles/1835585.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Raman spectroscopy
vitrinite reflectance
dispersed organic matter
coalification
Lower Silesia Coal District
Bohemian Massif
spektroskopia Ramana
refleksyjność witrynitu
rozproszona materia organiczna
uwęglenie
Dolnośląskie Zagłębie Węglowe
Masyw Czeski
Opis:
Raman spectroscopy and vitrinite reflectance measurements of dispersed organic matter from Carboniferous shales in boreholes in the northern part of the Intra-Sudetic Basin were used for thermal history reconstruction. Microscopic investigations have shown that the organic matter is dominated by the vitrinite maceral group. In analysed samples, organic matter shows a varied degree of thermal alteration determined by the mean random vitrinite reflectance (VRo) ranging from 0.72% to 3.80%. Mean apparent maximum vitrinite reflectance (R’max) values reached 4.98%. The full width at half maximum of D1 and G bands in Raman spectra are well-correlated with mean VRo and R’max. Thermal maturity in the boreholes shows a regular increase with depth. Geological data combined with Raman spectroscopy and mean vitrinite reflectance results indicate that the analysed Carboniferous strata reached maximum paleotemperatures from c. 110 to c. 265°C. The regional paleogeothermal gradient in the late Paleozoic was c. 80°C/km. The Variscan heating event presumably caused a major coalification process of organic matter. The Carboniferous–Permian magmatic activity must have contributed to high heat flow, adding to the effect of sedimentary burial on the thermal maturity.
Źródło:
Acta Geologica Polonica; 2020, 70, 3; 363--396
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal history of the Carboniferous strata in the northern part of the Intra-Sudetic Basin (SW Poland): A combined Raman spectroscopy and organic petrography study
Autorzy:
Botor, Dariusz
Toboła, Tomasz
Waliczek, Marta
Powiązania:
https://bibliotekanauki.pl/articles/139342.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Raman spectroscopy
vitrinite reflectance
dispersed organic matter
coalification
Lower Silesia Coal District
Bohemian Massif
spektroskopia Ramana
refleksyjność witrynitu
rozproszona materia organiczna
uwęglenie
Dolnośląskie Zagłębie Węglowe
Masyw Czeski
Opis:
Raman spectroscopy and vitrinite reflectance measurements of dispersed organic matter from Carboniferous shales in boreholes in the northern part of the Intra-Sudetic Basin were used for thermal history reconstruction. Microscopic investigations have shown that the organic matter is dominated by the vitrinite maceral group. In analysed samples, organic matter shows a varied degree of thermal alteration determined by the mean random vitrinite reflectance (VRo) ranging from 0.72% to 3.80%. Mean apparent maximum vitrinite reflectance (R’max) values reached 4.98%. The full width at half maximum of D1 and G bands in Raman spectra are well-correlated with mean VRo and R’max. Thermal maturity in the boreholes shows a regular increase with depth. Geological data combined with Raman spectroscopy and mean vitrinite reflectance results indicate that the analysed Carboniferous strata reached maximum paleotemperatures from c. 110 to c. 265°C. The regional paleogeothermal gradient in the late Paleozoic was c. 80°C/km. The Variscan heating event presumably caused a major coalification process of organic matter. The Carboniferous–Permian magmatic activity must have contributed to high heat flow, adding to the effect of sedimentary burial on the thermal maturity.
Źródło:
Acta Geologica Polonica; 2020, 70, 3; 363-396
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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