1,720,993 research outputs found
Post-Variscan thermal history of the Moravo-Silesian lower Carboniferous Culm Basin (NE Czech Republic - SW Poland)
No full textPost-Variscan thermal history of the Boskovice Basin (Bohemian Massif, Czech Republic) based on thermochronology data
No full textBurial and thermal history of the Lower Palaeozoic petroleum source rocks at the SW margin of the East European Craton (Poland)
No full textThermal maturity modelling was carried out in over sixty wells along the SW margin of the East European Craton (EEC). The burial and thermal history modelling of the EEC, using thermochronological data, allowed the construction of burial history maps showing its geological development in the Phanerozoic. These results have proved that the Ordovician and Silurian source rocks occurring at the SW margin of the EEC reached a maximum palaeotemperature in the Palaeozoic, mainly during Devonian-Carboniferous time and at the latest during the Silurian in the most westerly part of this margin, along the Teisseyre-Tornquist Zone. In Mesozoic and Cainozoic time, the Ordovician and Silurian strata generally were subjected to cooling or to very minor heating, certainly below the Variscan level. The maximum burial and maximum temperature of the Ediacaran-Lower Palaeozoic strata were reached during the Early Carboniferous in the Baltic Basin and during the Late Carboniferous in the Lublin area, and even in the Early Permian in the SE corner of the Lublin Basin. Thus, the main period of maturation of organic matter and hydrocarbon generation in the Ordovician and Silurian source rocks was in the Late Palaeozoic (mainly Devonian-Carboniferous) and in the westernmost zone along the Teisseyre-Tornquist line at the end of the Silurian
Tectonothermal history of the Holy Cross Mountains (Poland) in the light of low-temperature thermochronology
No full textThermal history of the East European Platform margin in Poland based on apatite and zircon low-temperature thermochronology
Full text linkThe Phanerozoic tectonothermal evolution of the SW slope of the East European Platform (EEP) in Poland is reconstructed by means of thermal maturity, low-temperature thermochronometry, and thermal modelling. We provide a set of new thermochronometric data and integrate stratigraphic and thermal maturity information to constrain the burial and thermal history of sediments. Apatite fission track (AFT) analysis and zircon
(U-Th)/He (ZHe) thermochronology have been carried out on samples of sandstones, bentonites, diabase, and crystalline basement rocks collected from 17 boreholes located in central and NE Poland. They penetrated sedimentary cover of the EEP subdivided from the north to south into the Baltic, Podlasie, and Lublin basins. The average ZHe ages from Proterozoic basement rocks as well as Ordovician to Silurian bentonites and Cambrian to lower Carboniferous sandstones range from
848 ± 81 to 255 ± 22 Ma with a single early Permian age of 288 Ma, corresponding to cooling after a thermal event. The remaining ZHe ages represent partial reset or source ages. The AFT ages of samples are dispersed in the range of 235.8 ± 17.3 Ma (Middle Triassic) to 42.1 ± 11.1 Ma (Paleogene) providing a record of Mesozoic and Cenozoic cooling. The highest frequency of the AFT ages is in the Jurassic and Early Cretaceous prior to Alpine basin inversion. Thermal maturity results are consistent with the SW-ward increase of the Paleozoic and Mesozoic sediments thickness. An important break in a thermal maturity profile exists across the base Permian–Mesozoic unconformity. Thermal modelling showed that significant heating of Ediacaran to Carboniferous sedimentary successions occurred before the Permian with maximum paleotemperatures in the earliest and latest Carboniferous for Baltic–Podlasie and Lublin basins, respectively. The results obtained suggest an important role of early Carboniferous uplift and exhumation at the SW margin of the EEP. The SW slope of the latter was afterward overridden in the Lublin Basin by the Variscan orogenic wedge. Its tectonic loading interrupted Carboniferous uplift and caused resumption of sedimentation in the late Viséan.
Consequently, a thermal history of the Lublin Basin is different from that in the Podlasie and Baltic basins but similar to other sections of the Variscan foreland, characterized by maximum burial at the end of Carboniferous. The Mesozoic thermal history was characterized by gradual cooling from peak temperatures at the transition from Triassic to Jurassic due to decreasing heat flow. Burial caused maximum paleotemperatures in the SW part of the study area, where the EEP was covered by an extensive sedimentary pile. However, further NE, due to low temperatures caused by shallow burial, the impact of fluids can be detected by vitrinite reflectance, illite/smectite, and thermochronological data. Our new results emphasize the importance of using multiple low-temperature thermochronometers and thermal modelling in connection with thermal maturity analysis to elucidate the near-surface evolution of platform margins.</p
The geological characteristics of coal–bearing formations of the Upper Carboniferous in the area of the Sobieski Mine
No full textThis M.S. thesis shows geological conditions of Jaworzno bituminous coal deposits, which is operates by the Sobieski Mine. The coal field is located in the E part of the Upper Silesia Coal Basin (USCB). In the Sobieski mining area has been exploiting energy coal type 31.1 and 31.2 in the łaziskie and orzeskie beds. The calorific value ranges between 20 and 24 MJ/kg, the average content total sulphur is 1,6 % and ash content is 15,75 %. In this work were introduced the characteristics stratigraphy and lithology coal-bearing strata and tectonic deposits. On the basis released lithostratigraphic profiles from boreholes were carried out an analysis of technological parameters of the coal seams łaziskie and orzeskie beds and it were used to performed top and bottom maps of this beds. Also made thickness of selected coal seams maps. Balance resources of coal came to 919 200 thousand tons.The object of this paper is to analyze a issue of performance optimization of code which is designed to run on virtual machine environments. Performance optimization is important aspect for code that performs numerical calculations. The first part of this paper focuses on virtual machines technology and basic techniques of code optimization which are usually performed by compilers. The next part presents two non-conventional techniques designed by author which allow to speed up calculation of mathematical operations such as a mantissa of a real number and a metric angle unit conversion from degrees to radians. After that are presented test results of this optimizations which have checked their performance and correctness of generated results. The last part presents tools and techniques which are useful by code optimizing, and tips how to perform optimizations and when it is harmful.praca magistersk
Burial and thermal history of the Upper Silesian Coal Basin (Poland) constrained by maturity modelling : implications for coalification and natural gas generation
No full textMaturity modelling was carried out using basin and petroleum system modelling (BPSM) software in the lithologic sections of 17 wells of the Upper Silesian Coal Basin (Poland). The best fit between calculated and measured vitrinite reflectance (VR), porosity and density data was obtained by applying a thickness of eroded sedimentary overburden from 1700 m in the east to 4500 m in the west and relatively low to moderate heat flow values during the maximum late Carboniferous burial. These heat flow values were in the range 50-71 mW/m
Modelowania 1-D procesów generowania gazu ziemnego w utworach karbońskich w głębokiej części polskiego basenu czerwonego spągowca One-dimensional modeling of gas generation processes in Carboniferous sediments from the deep part of Polish Rotliegend basin /
No full textTyt. z nagłówka.Bibliogr. s. 513-515.Wykonano numeryczne modelowania jednowymiarowe procesów generowania węglowodorów w profilach karbońskich skał macierzystych w podłożu wybranych stref centralnej części głębokiego basenu czerwonego spągowca (Objezierze IG-1, Piła IG-1, Byczyna-1, Brześć Kujawski IG-1, Budziszewice IG-1 i Kutno-1). Utwory karbońskie analizowanej strefy wykazujące średnią refleksyjność witrynitu w przedziale od około 1.0% do 2.7% generowały znaczne ilości metanu przy umiarkowanej jeszcze ilości azotu. Termogeniczne generowanie gazu miało miejsce głównie przez cały mezozoik aż do późnej kredy włącznie. Jego zawansowanie i przebieg wykazują pewne zróżnicowanie przejawiające się zróżnicowanym zakresem transformacji kerogenu (od 77% do 100%) w strefach maksymalnych dojrzałości materii organicznej. Najważniejszy etap generowania gazu występował pomiędzy końcem wczesnego triasu a końcem późnej jury.One-dimensional numerical modeling of hydrocarbon generation in profiles of Carboniferous source rocks was performed. These source rocks were located in the substratum of select areas in the central deep Rotligend Basin (Objezierze IG-1, Piła IG-1, Byczyna-1, Brześć Kujawski IG-1, Budziszewice IG-1 and Kutno-1). Carboniferous sediments of the central deep basin with a mean random vitrinite reflectance of 1.0-2.7%, generated significant amounts of methane, with low nitrogen content. Gas generation processes occurred mostly during the Mesozoic era particularly between Early Triassic to Late Jurassic periods and achieved kerogen transformation ratio (TR) values of 77-100%.Dostępny również w formie drukowanej.SŁOWA KLUCZOWE: polski basen czerwonego spągowca, uwęglenie, modelowanie dojrzałołości termicznej, generowanie węglowodorów. KEYWORDS: Polish Rotliegend Basin, coalification, maturity modeling, hydrocarbon generation
Ewolucja stopnia uwęglenia utworów górnokarbońskich w obszarze górniczym "Janina" w Libiążu we wschodniej części Górnośląskiego Zagłębia Węglowego (GZW) Coalification history of the Upper Carboniferous sediments in the mining area "Janina" in Libiąż (eastern part of the Upper Silesian Coal Basin) /
No full textTyt. z nagłówka.Bibliografia s. 111-113.Dostępny również w formie drukowanej.ABSTRACT: 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/m2 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. KEYWORDS: Upper Silesian Coal Basin (USCB), coalification, maturity modelling. SŁOWA KLUCZOWE: Górnośląskie Zagłębie Węglowe (GZW), uwęglenie, modelowanie dojrzałości termicznej
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