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Wyświetlanie 1-5 z 5
Tytuł:
Habitat and hydrocarbon potential of the Mesozoic strata in the Kraków–Rzeszów area (SE Poland)
Autorzy:
Kosakowski, P.
Więcław, D.
Kotarba, M. J.
Kowalski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2058966.pdf
Data publikacji:
2012
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Carpathian Foredeep substratum
Mesozoic strata
Middle Jurassic source rock
petroleum geochemistry
quality of source rocks
Opis:
The Mesozoic strata in the southeastern Poland were geochemically characterized to determine their hydrocarbon potential on the basis of 483 core samples from 36 boreholes. The Lower and Middle Triassic, Middle and Upper Jurassic, and Lower and Upper Cretaceous turned out to be highly variable. Middle Jurassic rocks represent the highest geochemical quality. Their total organic carbon (TOC) contents range between 0.0 and 17.0 wt.%, with a median of 0.89 wt.%. The highest TOC was observed in the rocks of the Tarnawa 1 borehole. In the remaining boreholes analysed the organic carbon contents were much lower and usually did not exceed 1 wt.%. Gas-prone Type-III kerogen with an admixture of Type-II kerogen is present in the study area. The lowest TOC values were observed in the Cretaceous rocks, where median values were 0.05 wt.% and 0.04 wt.% for Upper Cretaceous and Lower Cretaceous strata respectively. Low TOC contents were also observed in the Lower Triassic and Upper Jurassic strata. Accordingly, those horizons could not be regarded as effective source rocks. The petroleum potential of these stratigraphic horizons is additionally significantly reduced by low maturity, below the threshold for the generation of hydrocarbons. The Mesozoic organic matter was found to be generally immature, i.e. below 0.5% of vitrinite reflectance.
Źródło:
Geological Quarterly; 2012, 56, 1; 139-152
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potencjał węglowodorowy skał macierzystych i geneza gazu ziemnego akumulowanego w utworach miocenu zapadliska przedkarpackiego w strefie Rzeszowa
Hydrocarbon potential of source rocks and origin of natural gases accumulated in Miocene strata of the Carpathian Foredeep in Rzeszów area
Autorzy:
Kotarba, M. J.
Więcław, D.
Kosakowski, P.
Kowalski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2074398.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
zapadlisko przedkarpackie
miocen autochtoniczny
kopalna substancja organiczna
geochemia
potencjał węglowodorowy
gaz ziemny
izotopy trwałe
Carpathian Foredeep
autochthonous Miocene
organic matter
hydrocarbon potential
methane
gas origin
microbial processes
organic geochemistry
stable isotopes
Opis:
In the autochthonous Upper Badenian and Lower Sarmatian strata of the Carpathian Foredeep in the Rzeszów area the total organic carbon (TOC) contents vary from 0.02 to 1.26 wt. %(average 0.64 wt. %). Geochemical studies on the dispersed organic matter demonstrated the presence of gas-prone type III (humic) kerogen with small admixtures of algal type II kerogen. At depths less than 2,500 metres the organic matter is immature, thus microbial processes predominated. Methane concentration in natural gases accumulated within Miocene strata usually exceeded 94 vol. %and was generated by microbial reduction of carbon dioxide. Microbial methane was generated mainly during deposition of autochthonous Miocene sediments, but it is possible that this process continues today on a small scale. Higher gaseous hydrocarbons (mainly ethane and propane), which are usually minor constituents (concentrations less than 0.4 vol. %), were generated during diagenetic processes and at the initial stage of the low-temperature thermogenic processes. The slight changes in the geochemical indices of dispersed organic matter and isotope ratios of natural gases with depth are evidence of the homogeneity of deposition of humic organic matter in shallow marine basin during the Late Badenian and the Early Sarmatian and the fact that similar gas generation conditions can be found in the Miocene sequence. Generation and accumulation of microbial methane and the formation and charging multiple stacked reservoirs within the autochthonous Miocene strata, e.g., Palikówka, Jasionka, Stobierna and Terliczka deposits, was facilitated by rhythmic and cyclic deposition of clays and sands and their very high sedimentation rate.
Źródło:
Przegląd Geologiczny; 2005, 53, 1; 67--76
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Habitat and hydrocarbon potential of the Palaeozoic source rocks in the Kraków–Rzeszów area (SE Poland)
Autorzy:
Więcław, D.
Kotarba, M. J.
Kowalski, A.
Kosakowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/191373.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
source rock
hydrocarbon potential
Rock-Eval pyrolysis
biomarkers
stable carbon isotopes
Palaeozoic basement
Małopolska Block
Polish Carpathian Foredeep
Opis:
The quantity, genetic type and maturity of organic matter dispersed in Ordovician, Silurian, Devonian and Lower Carboniferous strata in the basement of the Carpathian Foredeep between Kraków and Rzeszów were determined based on the results of organic geochemical analyses of 600 rock samples collected from 44 wells. The best source rocks were found in the Silurian strata where the total organic carbon (TOC) content is up to 6.6 wt% and the median value equals ca. 1.5 wt%. The median values of the initial organic carbon contents in individual wells vary from 1.2 to 3.5 wt%. The Ordovician, Lower Devonian and clastic facies of the Lower Carboniferous strata can be considered as an additional source of hydrocarbons with the median TOC values of 0.27, 0.56 and 0.53 wt%, respectively. The Middle and Upper Devonian strata as well as the carbonate facies of the Lower Carboniferous strata have much lower quantities of organic carbon, although in these strata levels with elevated TOC contents were observed. In the Lower Palaeozoic and Lower Devonian strata, the oil-prone, low-sulphur Type II kerogen is present, whereas in the younger divisions presence of the gas-prone Type III kerogen is visible. In the Lower Carboniferous clastics gas-prone kerogen dominates. The Silurian and clastic facies of the Lower Carboniferous strata have been deposited in the normal marine conditions, whereas the Ordovician, Devonian and carbonate facies of the Lower Carboniferous strata usually experienced reducing conditions. The source rocks are mostly at the initial and middle phase of the low-temperature thermogenic processes. Locally, immature (in the Lower Carboniferous carbonates in the vicinity of Łąkta gas-condensate field) or late-mature (in the Middle and Upper Devonian strata in the area of Grobla–Pławowice oil field) source rocks were observed.
Źródło:
Annales Societatis Geologorum Poloniae; 2011, 81, No 3; 375-394
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Habitat and hydrocarbon potential of the lower Paleozoic source rocks in the Polish part of the Baltic region
Autorzy:
Kowalski, A.
Więcław, D.
Grotek, I.
Kotarba, M. J.
Kosakowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/2059076.pdf
Data publikacji:
2010
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Baltic Region
northern Poland
source rock
hydrocarbon potential
Lower Paleozoic
Opis:
The quantity, genetic type and maturity of organic matter dispersed in the Lower Cambrian to the uppermost part of the Silurian (Pridoli) sequence of the Polish part of the Baltic region was determined based on the results of geochemical analyses of a total of 1377 rock samples collected from 38 onshore and offshore boreholes. The best source rocks were found in the Upper Cambrian-Tremadocian succession where present and initial total organic carbon (TOC) contents are up to ca. 18 and 20 wt.%, respectively. Caradocian (Ordovician) strata can be considered as an additional source of hydrocarbons. In the individual boreholes median present and initial TOC contents vary from 0.5 to 3.3 wt.% and from 1 to 6 wt.%, respectively. The Llandovery (Silurian) strata reveal moderate and locally high hydrocarbon potential of the source rocks. The present TOC content reaches locally 10 wt.% (usually 1-2 wt.%). Another source of hydrocarbons can be clayey intercalations within the Middle Cambrian strata. Their organic matter content rarely exceeds 1 wt.%, being often a result of advanced organic matter transformation. In all lower Paleozoic strata investigated from the Polish part of the Baltic region oil-prone, low-sulphur Type-II kerogen occurs, deposited in anoxic or sub-oxic conditions. The maturity of all source rocks changes from the initial phase of the low-temperature thermogenic processes in the northeastern part to the overmature stage in the southwestern part of the study area.
Źródło:
Geological Quarterly; 2010, 54, 2; 159-182
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of hydrocarbon potential of the autochthonous Miocene strata in the NW part of the Ukrainian Carpathian Foredeep
Autorzy:
Kotarba, M. J.
Więcław, D.
Kosakowski, P.
Koltun, Y. V.
Kowalski, A.
Powiązania:
https://bibliotekanauki.pl/articles/191375.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
source rocks
hydrocarbon potential
organic geochemistry
Miocene
Bilche-Volytsia Unit
Ukrainian Carpathian Foredeep
Opis:
The quantity, genetic type, maturity and hydrocarbon potential of dispersed organic matter were determined for the complete sequence of the autochthonous Miocene ranging from the Lower Badenian Sandy-Calcareous Series to the Lower Sarmatian Upper Dashava Formation of the Bilche-Volytsia Unit. Geochemical analyses were conducted on 78 core samples collected from 11 wells in the Ukrainian Carpathian Foredeep between the Ukrainian-Polish state border and the Stryi River. The most favourable source-rock parameters characterize the Upper Badenian Kosiv Formation where the highest TOC contents, from 0.44 to 2.01 wt% (median 0.76 wt%), were found. Only slightly lower values were obtained for the Lower and the Upper Dashava formations – from 0.01 to 1.45 wt% (median 0.72 wt%) and from 0.62 to 0.77 wt% (median 0.71 wt%), respectively. In the Lower Badenian Sandy-Calcareous Series, the Lower Badenian Baraniv beds, and the Upper Badenian Tyras Formation, the TOC content is lower and varies from 0.00 to 0.77 wt%. Immature type III (terrestrial) kerogen dominates the analysed sections of the Kosiv and Dashava formations. Marine organic matter was detected sporadically, and only in the Upper Badenian Kosiv Formation in the vicinity of Kokhanivka, and in the Upper Badenian Kosiv and Tyras formations.
Źródło:
Annales Societatis Geologorum Poloniae; 2011, 81, No 3; 395-407
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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