Browsing by Subject "maturity modelling"

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Access status: Restricted ,
Analiza stopnia uwęglenia w utworach karbońskich w podłożu Karpat w rejonie Bielsko-Cieszyn
(Data obrony: 2010-03-26) Grabowska, Renata
Wydział Geologii, Geofizyki i Ochrony Środowiska
The study aimed reveal thermal and burial history in S part of Upper Silesian Coal District (Bielsko – Cieszyn area). The models were made on the basis of borehole litostratigraphic profiles with vitrinite reflectance measured. The simulation of coal rank were conducted in 5 borhole profiles: Rudzica IG-1, Bielowicko IG-1, Cieszyn IG-1, Krasna-1, Jarząbkowice-1. Modelling was carried out by varying the paleoheat flow and post Carboniferous erosion. Heat flow in the time of maximum sediments burial was similar to present and amounted about 80 mW/m2. Maximum vitrinite reflectance value was reached in the end of late Carboniferous. Post Carboniferous erosion caused that about 2900 m sediments were removed. The bottom of Carboniferous probably reached depth from 2784 m in model Cieszyn IG-1 to 4773 m in Rudzica IG-1 model. The maximum paleotemperature of the Carboniferous bottom amounted from 160 OC in a Bielowicko IG-1 model to 190 OC in a Krasna-1 model. In the study area the coalification was a result of fast burial of Carboniferous deposits and temperature increase before Asturian inversion of the USCD (~ 299 Ma).
Access status: Open Access ,
Ewolucja stopnia uwęglenia utworów górnokarbońskich w obszarze górniczym »Janina« w Libiążu we wschodniej części Górnośląskiego Zagłębia Węglowego (GZW)
(Wydawnictwa AGH, 2009) Botor, Dariusz
Maturity modelling of the Upper Carboniferous sediments has been performed in order to explain the coalification history. Assuming 2000 m eroded overburden of the post-Stephanian sandstones paleoheat flow was 51 mW/m$^{2}$ in the latest Carboniferous time. The major coalification processes were likely occurred in the latest Carboniferous, and later a Mesozoic overprinting likely due to fluid migration was not significant for the organic matter maturity.
Access status: Open Access ,
Hydrothermal fluids influence on the thermal evolution of the Stephanian sequence, the Sabero Coalfield (NW Spain)
(Wydawnictwa AGH, 2012) Botor, Dariusz
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.