Temat: Baltic Basin - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Reconstruction of initial thickness and geometry of the Lower Palaeozoic strata in the Podlasie and Baltic basins, East European Craton
Autorzy:: Barmuta, Jan
Barmuta, Maria
Golonka, Jan
Papiernik, Bartosz
Powiązania:: https://bibliotekanauki.pl/articles/191593.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Geologiczne
Tematy:: subsidence
decompaction
restoration
Podlasie Basin
Baltic Basin
Mazury High
shale gas
Opis:: The aim of this study was to use the structural restoration technique to verify the correctness of the structural and palaeothickness maps created during the BLUE GAS Project. On the basis of well data as well as refined structural and palaeothickness maps of Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian, Triassic, Jurassic and Cretaceous horizons, a cross-section running across the Baltic Basin, the Mazury High and the Podlasie Basin was created. During the restoration process, the effects of compaction and fault activity were removed sequentially. The amount of erosion was estimated on the basis of the corrected palaeothickness maps. The resulting restoration is geologically reasonable and therefore both the structural and palaeothickness maps should be regarded as reliable. The reconstruction also allowed reproduction of the initial geometry and thickness of the Cambrian–Devonian strata and the recognition of three main episodes in the evolution of the sedimentary cover of this part of the East European Craton. The first episode was related to the deposition of the Lower Palaeozoic (up to the Lower Devonian) sedimentary complex on the relatively flat surface of the East European Craton edge. During the second episode, lasting most probably to the Permian, the Baltic and Podlasie Basins subsided significantly. The amount of subsidence was much higher in the Podlasie Basin. The third episode is related to the deposition of the almost flat-lying Mesozoic–Cainozoic complex.
Źródło:: Annales Societatis Geologorum Poloniae; 2019, 89, 4; 471-480
0208-9068
Pojawia się w:: Annales Societatis Geologorum Poloniae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Comparison of joint sets orientation in the Lower Paleozoic shales exposed in Scania (SW Sweden) and concealed in N Poland : a multi-methodological approach
Autorzy:: Olkowicz, Marcin
Bobek, Kinga
Jarosiński, Marek
Pachytel, Radomir
Powiązania:: https://bibliotekanauki.pl/articles/2058695.pdf
Data publikacji:: 2021
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: joint system
shale formations
Baltic Basin
photogrammetry
borehole scanner
Opis:: The Lower Paleozoic shales of SW Sweden and Eastern Pomerania (Poland) have a common history related to the depositional and tectonic evolution of the Baltic Basin. The major tectonic events are recorded, among others, as joints, which are either exposed in outcrops in SW Sweden or recognised in deep boreholes located in Pomerania. We present a comparison of the regional joint systems recognized by multiple methods in the studied region. In effect of a statistical compilation of measurements, five joint sets (named JS 1 to JS 5) were identified, traceable between Eastern Pomerania and SW Sweden. Our analysis showed a general consistency of joint set orientations, independent of their distance to the Tornquist tectonic zone passing through the study region. Three of the joint sets, JS 1 striking NNE, JS 2 striking WNW, and JS 3 striking NNW, are found to be the most frequent sets, occurring in most sites. Having more constant orientation, the JS 1 and JS 3 served as indicators of possible rotation of the tectonic block or stress field in the region. JS 1 and JS 2 are interpreted as an effect of late Carboniferous stress relaxation after Variscan collision, while JS 3 and the E–W striking JS 4 might be related to the Early Devonian Caledonian compressive stage.
Źródło:: Geological Quarterly; 2021, 65, 4; s. 258--275
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Seismo-geological model of the Baltic Basin (Poland)
Autorzy:: Kasperska, Monika
Marzec, Paweł
Pietsch, Kaja
Golonka, Jan
Powiązania:: https://bibliotekanauki.pl/articles/191810.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Geologiczne
Tematy:: Baltic Basin
East European Platform
Palaeozoic
lithostratigraphy
tectonics
seismic interpretation
Opis:: The aim of this study is to construct a seismo-geological model of the western part of the Baltic Syneclise. This model enables reconstruction of the tectonic processes taking place in this area, which had a significant impact on the formation of prospective zones for the occurrence of unconventional hydrocarbon accumulations. The two seismic surveys Opalino 3D and Kościerzyna-Gdańsk 2D, together with borehole data available in the vicinity, were used for the research. Well data were used not only for the seismic-to-well tie, but also for the construction of well cross-sections (including balanced ones). The structural interpretation of seismic boundaries enabled the separation of four structural stages: Precambrian; Caledonian, Permian-Mesozoic and Cenozoic. The seismic interpretation of the Opalino 3D survey indicates the presence of block-style tectonics in this area. This system is considered to be a part of a large block system, also extending throughout the area of the 2D survey. The Caledonian interval shows the greatest degree of structural complexity. Most of the large Palaeozoic dislocations already had been formed in the Cambrian. They underwent reactivation and/or inversion in the Silurian, or in the final stages of the Caledonian and/or Variscan Orogeny, at the latest. The current shape and structure of the Baltic Syneclise and the development of the Palaeozoic sedimentary cover were significantly influenced by the processes taking place in the Teisseyre-Tornquist Zone (TTZ). The dislocations of the Lower Palaeozoic stage are characterized by general NW-SE and NE-SW trends, although the first of these seems to be dominant.
Źródło:: Annales Societatis Geologorum Poloniae; 2019, 89, 2; 195-213
0208-9068
Pojawia się w:: Annales Societatis Geologorum Poloniae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Integrated geophysical data for sweet spot identification in Baltic Basin, Poland
Autorzy:: Cichostępski, Kamil
Kwietniak, Anna
Dec, Jerzy
Kasperska, Monika
Pietsch, Kaja
Powiązania:: https://bibliotekanauki.pl/articles/191761.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Geologiczne
Tematy:: shale plays
sweet spots
seismic inversion
resolution enhancement
Polska
Baltic Basin
Opis:: In the paper, the authors present the results of seismic reservoir characterization of shale gas deposits of the Lower Silurian and Ordovician (Sasino Formation and Jantar Formation), which are localized within the onshore part of the Baltic Basin, N Poland. For this purpose, acoustic inversion of seismic data and petrophysical analysis of well-log data were incorporated. The new approach that the authors used for acoustic inversion was the resolution enhancement algorithm, known as spectral blueing, before proceeding with the acoustic inversion process. The spectral blueing procedure enhances the seismic spectrum by weighting it with the well reflectivity spectrum. The resulting enhanced seismic volume manifests itself in higher energies of the high frequency component, while keeping the frequency range constant. With the results of acoustic inversion after the spectral blueing procedure, the authors were able to define two more potential exploration sites within the Ordovician deposits.
Źródło:: Annales Societatis Geologorum Poloniae; 2019, 89, 2; 215-231
0208-9068
Pojawia się w:: Annales Societatis Geologorum Poloniae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Unconfined compressive strength of Lower Paleozoic shales from the Baltic Basin (northern Poland)
Autorzy:: Wojtowicz, Michał
Jarosiński, Marek
Pachytel, Radomir Władysław
Powiązania:: https://bibliotekanauki.pl/articles/2059581.pdf
Data publikacji:: 2021
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: unconfined compressive strength
triaxial tests
empirical equations
shale reservoir
Baltic Basin
Opis:: Unconfined compressive strength of Lower Paleozoic shales from the Baltic Basin (northern Poland)Unconfined compressive strength (UCS) is one of the crucial parameters for geomechanical modelling of unconventional reservoirs useful for the design of hydraulic stimulation of hydrocarbon production. In spite of a large amount of UCS data collected from the Lower Silurian and Ordovician shale successions of the Baltic Basin (northern Poland), no comprehensive study on this subject has been published so far. Here, we compile the results of 247 single-stage confined compressive strength tests (CCST) provided by our industrial partner from four exploration boreholes. Based on the integration of these results with geophysical logging data, including dipole sonic logs, we derive empirical equations describing the relationship between UCS and Young’s modulus or sonic wave slowness. Considering the strong anisotropy of elastic properties in shales we have introduced different empirical equations for UCSv (vertical) and UCSh (horizontal), respectively perpendicular and parallel to bedding. The formula for UCSh is determined with less accuracy than for UCSv due to scarce laboratory tests with bed-parallel loading. Based on the empirical formula proposed, we have estimated the VTI-type of anisotropy to be in the range of 12–27%, depending on the lithostratigraphic formation. The results of our UCS estimations are compared with the results of multi-stage CCST from the adjacent borehole. Both confined tests yielded similar results for UCSv, with slightly higher values obtained from the multi-stage tests. In turn, a comparison of our solution with the results of true uniaxial compressive strength tests (UCST) for vertical samples from one of the studied boreholes revealed a significant discrepancy. The mean UCS results for shale formations from UCST are several times lower than those evaluated from the single-stage CCST. The usefulness of the results obtained for borehole breakout analysis is discussed.
Źródło:: Geological Quarterly; 2021, 65, 2; 65: 33
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Geological setting and Ediacaran–Palaeozoic evolution of the western slope of the East European Craton and adjacent regions
Autorzy:: Poprawa, Paweł
Powiązania:: https://bibliotekanauki.pl/articles/191938.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Geologiczne
Tematy:: Lower Palaeozoic
Ediacaran
Baltic Basin
Lublin-Podlasie Basin
geological map
geological cross-section
tectonic evolution
Opis:: A set of geological maps and geological cross-sections was prepared to document the geological setting of sedimentary basins developed on the western slope of the EEC and adjacent areas to the west. On the basis of these data and literature on the subject, the evolution of the sedimentary basins in the study area was reviewed, with special emphasis on the Ediacaran–Lower Palaeozoic basin. The basin originated during late Ediacaran rifting, related to the latest stages of breakup of the Precambrian super-continent Rodinia/Pannotia, associated with large-scale igneous activity. The rifting ultimately led to the formation of the Tornquist Ocean and subsequently, during the latest Ediacaran to Middle Ordovician, the SW margin of the newly formed Baltica became a passive continental margin. The upper Cambrian depocentre in the Biłgoraj-Narol Zone and the Łysogóry Block tentatively is interpreted as a small, narrow foredeep, related to the docking of the Małopolska Block to the western margin of Baltica. From the Late Ordovician through the Silurian, a gradual change to a collisional tectonic setting is observed across the entire SW margin of Baltica, as well as in the zones adjacent to it from the west, which together became the site of development of the extensive Caledonian foredeep basin, related to the convergence and collision of Avalonia and Baltica. The oblique character of the collision resulted in a prominent diachronism in the development of the foredeep basin. This refers to the initiation of basin subsidence, the starved basin phase, the main phase of rapid subsidence and supply of detritus from the west, and the termination of basin development. The Early Mississippian (Bretonian) phase of uplift and erosion and, to a lesser degree, also the Late Pennsylvanian one significantly affected the structure of the western EEC. During the Mississippian, extensive magmatic activity took place at the SW margin of East European Craton, in the region referred to here as the Baltic-Lublin Igneous Province.
Źródło:: Annales Societatis Geologorum Poloniae; 2019, 89, 4; 347-380
0208-9068
Pojawia się w:: Annales Societatis Geologorum Poloniae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Petrographic characteristics of the Ordovician and Silurian deposits in the Baltic Basin (N Poland) and their relevance for unconventional hydrocarbon accumulations
Autorzy:: Kuberska, Marta
Sikorska-Jaworowska, Magdalena
Kozłowska, Aleksandra
Podhalańska, Teresa
Powiązania:: https://bibliotekanauki.pl/articles/2060104.pdf
Data publikacji:: 2021
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: petrography
mineralogy
shale-type accumulations
total organic carbon
Ordovician rocks
Silurian rocks
Baltic Basin
Opis:: The Ordovician and Silurian deposits in the Baltic Basin are represented by siltstones, mudstones, limestones, marls, sandstones and, most commonly, claystones with a markedly shaley structure. Claystones that are particularly rich in organic matter are considered as potential reservoirs for shale gas accumulations. Samples from 11 boreholes, including core samples of the Piaśnica, Słuchowo, Kopalino, Sasino, Prabuty, Jantar, Pelplin and locally Pasłęk, Kociewie and Puck formations, were analysed by optical microscopy, cathodoluminescence (CL), scanning electron microscopy (SEM) and energy-dispersive spectrometry and X-ray diffraction analyses (XRD). The Piaśnica, Sasino, Jantar, Pasłęk and Pelplin formations are characterized locally by a dominance of black bituminous claystones with a high content of organic matter, and a generally consistent clay mineral composition. Individual samples only show variations in silt fraction and carbonate content. Very important is the negligible proportion of swelling minerals in the clay fraction; the percentage of smectite in the mixed-layered illite/smectite minerals does not exceed 15%. It is important for the rocks to have adequate [SiO2 >10%; Quartz (Q) + Feldspars (Fs) + Carbonates >40%] brittleness. The content of quartz, feldspars and carbonates (here >40%) suggests that the claystones are susceptible to hydraulic fracturing. The claystones show micropores between detrital grains, between the flakes of clay minerals, within pyrite framboids, and organic matter and secondary micropores within grains.
Źródło:: Geological Quarterly; 2021, 65, 3; 65: 44
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Attempts to calculate the pseudo-anisotropy of elastic parameters of shales gas formations based on well logging data and their geostatistical analysis
Autorzy:: Bała, Maria
Cichy, Adam
Wasilewska-Błaszczyk, Monika
Powiązania:: https://bibliotekanauki.pl/articles/184744.pdf
Data publikacji:: 2019
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: anisotropy parameters
P and S velocities
Baltic Basin
shale gas formations
acoustic dipole tool
semivariogram
Opis:: This paper presents the attempts to calculate the pseudo-anisotropy of elastic parameters for the Silurian and Ordovician shale formations of several wells located in the Baltic basin. For this purpose, well-logging data were used, in particular data recorded with acoustic dipole tools. With the P and S waves velocities available, measured at the dipole setting in two orthogonal directions XX or YY (SFast and SSlow), the elastic ε and γ parameters were calculated. In this paper we evaluate the effect of different factors e.g., porosity, clay and kerogen content on the velocity of anisotropy shale gas formations. A geostatistical analysis of elastic and reservoir properties was carried out in order to determine the character of the variability of Silurian and Ordovician shale formations in all of the studied wells. Semivariograms for each well characterizing the variation of elastic parameters in the vertical direction were calculated.
Źródło:: Geology, Geophysics and Environment; 2019, 45, 1; 5-20
2299-8004
2353-0790
Pojawia się w:: Geology, Geophysics and Environment
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Unconventional hydrocarbon prospects in Ordovician and Silurian mudrocks of the East European Craton (Poland) : Insight from three-dimensional modelling of total organic carbon and thermal maturity
Autorzy:: Papiernik, Bartosz
Botor, Dariusz
Golonka, Jan
Porębski, Szczepan J.
Powiązania:: https://bibliotekanauki.pl/articles/191357.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Geologiczne
Tematy:: Lower Palaeozoic
shale gas
shale oil
Baltic Basin
Lublin-Podlasie Basin
total organic carbon
thermal maturity
structural parametric model
Opis:: Three-dimensional, structural and parametric numerical modelling was applied to unravel the unconventional hydrocarbon potential of a W-dipping, Lower Palaeozoic mudrock succession, which subcrops for some 700 km in the Baltic, Podlasie and Lublin basins across the SW margin of East European Craton in Poland. Input data comprised structural and thickness maps of Ordovician and Silurian strata and the results of thermal maturity (mean vitrinite-equivalent reflectance, % Ro) and total organic carbon (TOC, % wt.) modelling. A new, spatial interpretation of vitrinite-reflectance variability indicates that the regional, W-increasing thermal maturity pattern breaks into a series of domains, bounded by abrupt maturity variations. In total, 14 tectono-thermal domains were recognised and their boundaries traced to known and inferred faults, mostly of NW‒SE and NE‒SW orientations. On the basis of a combination of thermal maturity and total organic carbon levels (0.6% > Ro<2.4%, and TOC >1.5% wt.), good-quality, unconventional reservoirs can be expected in the Sasino Formation (Caradoc) and Jantar Formation (early Llandovery) in the central and western Baltic Basin. The Jantar Formation also is likely to be prospective in the western Podlasie Basin. Marginal-quality reservoirs may occur in the Sasino and Jantar formations within the Podlasie and Lublin basins and in the Pasłęk Formation (late Llandovery) across all basins. Poor- to moderate-quality, unconventional reservoirs could be present in the Pelplin Formation (Wenlock) in the Lublin and southern Podlasie basins. In spite of a considerable hydrocarbon loss during multiphase basin inversion, the Ordovician and Silurian mudrocks still contain huge quantities of dispersed gas. Successful exploitation of it would require the adoption of advanced fracking methods.Lower Palaeozoic, shale gas, shale oil, Baltic Basin, Lublin-Podlasie Basin, total organic carbon, thermal maturity, structural-parametric model.
Źródło:: Annales Societatis Geologorum Poloniae; 2019, 89, 4; 511- 533
0208-9068
Pojawia się w:: Annales Societatis Geologorum Poloniae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Lithology and diagenesis of the poorly consolidated Cambrian siliciclastic sediments in the northern Baltic Sedimentary Basin
Autorzy:: Raidla, V.
Kirsimäe, K.
Bityukova, L.
Joeleht, A.
Shogenova, A.
Šliaupa, S.
Powiązania:: https://bibliotekanauki.pl/articles/2059134.pdf
Data publikacji:: 2006
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: Cambrian
Baltic Sedimentary Basin
siliclastic sediments
diagenesis
clay minerals
compaction
Opis:: The present study discusses lithology and diagenetic characteristics of the siliciclastic Cambrian and the enclosing Ediacaran and Ordovician deposits in the northern Baltic Sedimentary Basin (BSB). The Neoproterozoic and Lower Palaeozoic sediments are despite their age unconsolidated with primary porosity of 20-25% for both shales and sandstones. The sparse Fe-dolomite cementation of arenitic and subarenitic sandstones and siltstones occurs mainly at lithological contacts with the massive Ediacaran and Lower Cambrian claystones and is probably related to ions released during llitization. In contrast to weak mechanical and chemical compaction of sandstone, the clay mineral diagenesis of Cambrian deposits is well advanced. The highly illitic (80-90%) nature of illite-smectite (I-S) suggests evolved diagenetic grade of sediments which conflicts with shallow maximum burial and low compaction. Smectite-to-illite transformation has resulted in formation of diagenetic Fe-rich chlorite in claystones. Some porosity reduction of sandstones is due to formation of authigenic kaolinite at the expense of detrital mica or K-feldspar.
Źródło:: Geological Quarterly; 2006, 50, 4; 395-406
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: The use of X-ray computed microtomography for graptolite detection in rock based on core internal structure visualization
Autorzy:: Kaczmarek, Ł.
Kozłowska, A.
Maksimczuk, M.
Wejrzanowski, T.
Powiązania:: https://bibliotekanauki.pl/articles/139097.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: computed microtomography
visualization
graptolites
Silurian
Baltic Basin shale
mikrotomografia komputerowa
wizualizacja
graptolity
sylur
łupki basenu bałtyckiego
Opis:: This paper presents for the first time X-ray computed microtomography (μCT) analysis as a technique for Silurian graptolite detection in rocks. The samples come from the Jantar Bituminous Claystones Member of the Opalino core, Baltic Basin, northern Poland. Images were obtained with spatial resolution of 25 μm, which enabled the authors to create a 3-D visualization and to calculate the ratio of fissure and graptolite volume to the total sample volume. A set of μCT slices was used to create a 3-D reconstruction of graptolite geometry. These μCT slices were processed to obtain a clearly visible image and the volume ratio. A copper X-ray source filter was used during exposure to reduce radiograph artifacts. Visualization of graptolite tubaria (rhabdosomes) enabled Demirastrites simulans to be identified. Numerical models of graptolites reveal promising applications for paleontological research and thus for the recognition and characterization of reservoir rocks.
Źródło:: Acta Geologica Polonica; 2017, 67, 2; 299-306
0001-5709
Pojawia się w:: Acta Geologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Multivariate S-wave velocity prediction in the assessment of elastic parameters in shale formations
Autorzy:: Kaczmarczyk, Weronika
Słota-Valim, Małgorzata
Powiązania:: https://bibliotekanauki.pl/articles/1833906.pdf
Data publikacji:: 2020
Wydawca:: Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:: fala poprzeczna
formacje łupkowe
basen bałtycki
parametry sprężyste
shear wave
shale formations
Baltic basin
elastic properties
Opis:: Exploration and development of the hydrocarbons reservoir in unconventional rock formation is a huge challenge. Due to their specific nature, which is manifested by limited filtration properties, they require an appropriate approach and the use of specific solutions. They include, among others, the determination of zones with higher hydrocarbon potential – so called sweet spots, application of horizontal drilling technology, or designing as well as performing rock stimulation treatments of rocks usually with low or almost zero permeability with the use of hydraulic fracturing. The analysis of the right combination of parameters in this case can be essential and provide extremely important information about the reservoir in an unconventional rock formation. As one of the most important parameters allowing, among others, to characterize the reservoir in terms of rock susceptibility to hydraulic fracturing, elastic properties require the availability of shear wave Vs, which in contrast to compressional wave Vp in the Polish standard is measured rarely. Therefore, in this paper, a multivariate prediction of shear wave velocity was developed with the use of theoretical models known from the literature and modified, based on which we estimate the elastic parameters. Using the obtained results, the elastic parameters were calculated on the basis of which, in the next stage, interdisciplinary characterization of reservoir formation is possible, e.g. in the aspect of assessing the reservoir formation susceptibility to hydraulic fracturing and thus creating technological fractures constituting the migration path for reservoir fluids. Based on different solutions, 5 variants of shear wave velocity were developed in the borehole scale, the results of which were then used to calculate the elastic modules: the Young modulus and the Poisson ratio. Because of the availability of the measured shear wave in each analyzed wellbores, it was possible to verify the results of the estimated variants. Subsequently, for the purpose of spatial characterization of the reservoir, calculated variants of the Young modulus were integrated with the seismic data. The analysis was conducted in Ordovician – Silurian shale formations in the Baltic Basin, at intervals enriched with organic matter.
Źródło:: Nafta-Gaz; 2020, 76, 7; 441--448
0867-8871
Pojawia się w:: Nafta-Gaz
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Lower Paleozoic oil and gas shale in the Baltic-Podlasie-Lublin Basin (central and eastern Europe) - a review
Autorzy:: Poprawa, Paweł
Powiązania:: https://bibliotekanauki.pl/articles/2060266.pdf
Data publikacji:: 2020
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: Baltic-Podlasie-Lublin Basin
lower Paleozoic
shale oil
shale gas
reservoir characteristics
Opis:: In the Baltic-Podlasie-Lublin Basin, four potential lower Paleozoic shale reservoirs are identified: the Piaśnica, Sasino and Jantar formations, as well as the Mingajny shale. These units were diachronously deposited during the starved stages of Caledonian foredeep basin development, in the course of rising or high eustatic sea level. Across most of the basin, the shale formations analysed are saturated with light oil and condensate, and they are buried to depths of 2300-3500 m. The shale reservoirs reach the wet gas window at burial depths of 2800-4000 m, while dry gas accumulations occur at depths exceeding 3500-5000 m, except in the Biłgoraj-Narol Zone. The shale analysed might be generally classified as a moderate to low quality, and locally high quality, unconventional reservoir. Within the shale net pay zones, the average TOC content is 2-5 wt.% TOC. The exceptions are the Piaśnica Formation, for which this is 5-12 wt.%, and the Mingajny shale, which is TOC-lean (1.4-1.7 wt.%). The thickness of the shale net pay intervals in the most favourable locations, mainly on the Łeba Elevation, generally reaches 20 m, and locally exceeds 35 m. The shale reservoirs are saturated with hydrocarbons of good quality. Their permeability is low to moderate, often in the range of 150-200 mD, while total porosity average per borehole is commonly exceeds 6 %, reaching up to 10% at maximum, which might be considered as moderate to good. The clay minerals content is moderate to high (30-50%), and geomechanical characteristics of the shale formations are intermediate between brittle and ductile. No overpressure occurs in the basin, except for a dry gas zone in the SW Baltic Basin. In the Biłgoraj-Narol Zone, and to a lesser degree also in the Lublin region, pronounced tectonic deformation significantly limits shale gas/oil potential. Among 66 exploration boreholes drilled in the basin so far, only 5 were lateral boreholes with representative production test results. Hydrocarbon flow from the best boreholes was low to moderate, equal to 11.2 to 15.6 thousand m3/day for gas, and 157 bbl/day (~21.4 ton/day) for oil. There is, however, high potential to improve production flow rates, connected with the fracturing of two net pay intervals at one time, as well as with significant technological progress in the exploitation of shale basins during the last 5 years. Commercially viable production might be achieved for a single borehole with estimated ultimate recovery exceeding 30-50 thousand tons of oil, or 60-90 million m3 of gas.
Źródło:: Geological Quarterly; 2020, 64, 3; 515--566
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Charakterystyka parametrów sprężystych określonych na podstawie pomiarów geofizyki otworowej i modelowań teoretycznych w wybranych formacjach w otworach basenu bałtyckiego i wierconych na szelfie
Characteristics of elastic parameters determined on the basis of well logging measurements and theoretical modeling, in selected formations in boreholes in the Baltic Basin and the Baltic offshore
Autorzy:: Bała, M.
Powiązania:: https://bibliotekanauki.pl/articles/1835469.pdf
Data publikacji:: 2017
Wydawca:: Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:: gaz z łupków
parametry sprężyste
moduł Younga
współczynnik Poissona
basen bałtycki
geofizyka otworowa
shale gas
elastic parameters
Young's modulus
Poisson’s ratio
Baltic Basin
well logging
Opis:: W niniejszej pracy zawarto wyniki badań parametrów sprężystych pomierzonych akustyczną sondą dipolową lub obliczonych na podstawie teoretycznych modeli z kilku otworów położonych w basenie bałtyckim i trzech na szelfie. Badania ograniczono do pięciu formacji, poczynając od charakterystycznego poziomu sylurskiego ogniwa mułowców wapnistych z Redy, stanowiącego reper sejsmiczny Sb, a kończąc na kambrze środkowym – poziom Paradoxides paradoxissimus (PP). Zauważono pewne podobieństwa w kształtowaniu się takich parametrów sprężystych jak: prędkości fal podłużnych i poprzecznych, modułów Younga, odkształcenia objętości i postaci – w analizowanych otworach basenu bałtyckiego i odwierconych na szelfie. Otwory te znajdują się w strefie średniej perspektywności dla ropy naftowej i kondensatu oraz dobrej dla gazu ziemnego [14]. Przedstawiona charakterystyka parametrów sprężystych może być wykorzystana w modelowaniach sejsmicznych do badania zmienności poziomów stratygraficznych i wyjaśnienia szeregu problemów pojawiających się przy zintegrowanej interpretacji danych geofizyki otworowej i sejsmicznych pól falowych. Wspomaga również ocenę skał ilastych pod kątem prognozowania zabiegów szczelinowania hydraulicznego i udostępniania węglowodorów ze skał zbiornikowych o niskich przepuszczalnościach. Skały te charakteryzują się zróżnicowaną „kruchością” (brittleness), którą można rozpatrywać w aspekcie składu mineralnego i parametrów sprężystych, takich jak współczynnik Poissona, moduł Younga, moduł odkształcenia objętości, postaci oraz stałe Lamégo.
The paper shows the results of studies of elastic parameters determined on the basis of well acoustic measurements and theoretically modeled in selected boreholes located in the Baltic Basin and offshore Baltic Sea. The study was limited to five formations, starting from the characteristic level of the Silurian Reda calcareous sandstone Member, which is the seismic Sb benchmark and ending with the Middle Cambrian level Paradoxides Paradoxissimus (PP). It was noted, that there were similarities in the distribution of the elastic parameters, such as the velocity of compressed and shear waves, dynamic Young’s modulus, bulk and shear moduli in analyzed boreholes in the Baltic Basin and those drilled in the shelf. These boreholes are located in a zone of average prospects for oil and condensate and good for natural gas [14]. The presented characteristics of elastic parameters may be used in seismic modeling to study the variability of stratigraphic levels and to clarify a number of problems occurring during the integrated data interpretation of well logs and seismic wave fields. It also supports the evaluation of clay rocks for the prediction of hydraulic fracturing and the production of hydrocarbons from reservoir rocks with low permeability. Sedimentary rocks are differentiated in brittleness, which can be seen in terms of the mineral composition and elastic parameters, such as Poisson’s ratio, Young’s modulus, and bulk and shear moduli as well as Lamé’s constant.
Źródło:: Nafta-Gaz; 2017, 73, 8; 558-570
0867-8871
Pojawia się w:: Nafta-Gaz
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Marine snow and epipelagic suspensoids in the Reda carbonates and a pronounced mid-Ludfordian (Silurian) CIE in the axis of the Baltic Basin (Poland)
Autorzy:: Kozłowski, Wojciech
Powiązania:: https://bibliotekanauki.pl/articles/1835581.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: pelagic carbonates
Sparoids
marine snow
algal blooms
eolian dust
carbonate supersaturation
euxinia
Baltic basin
Reda Member
ludlow
Silurian
węglany pelagiczne
sparoidy
śnieg morski
zakwit glonów
osady eoliczne
basen bałtycki
sylur
Opis:: The mid-Ludfordian pronounced, positive carbon isotope excursion (CIE), coincident with the Lau/kozlowskii extinction event, has been widely studied so far in shallow-water, carbonate successions, whereas its deep-water record remains insufficiently known. The aim of this research is to reconstruct the sedimentary environments and the palaeoredox conditions in the axial part of the Baltic-Podolian Basin during the event. For these purposes, the Pasłęk IG-1 core section has been examined using microfacies analysis, framboid pyrite diameter and carbon isotope measurements. The prelude to the event records an increased influx of detrital dolomite interpreted as eolian dust, coupled with a pronounced decrease in the diameter of the pyrite framboids, indicating persistent euxinic conditions across the event. The event climax is recorded as the Reda Member and consists of calcisiltites, composed of calcite microcrystals (‘sparoids’), which are interpreted as suspensoids induced by phytoplankton blooms in the hipersaturation conditions present in the epipelagic layer of the basin. Both the prelude and climax facies show lamination, interpreted as having resulted from periodical settling of marine snow, combined with hydraulic sorting within a ‘benthic flocculent layer’, which additionally may be responsible for a low organic matter preservation rate due to methanogenic decomposition. Contrary to the observed basinward CIE decline in the benthic carbonates in the basin, the Reda Member records an extremely positive CIE (up to 8.25‰). Given the pelagic origin of the sparoids, the CIE seems to record surface-water carbon isotope ratios. This points to a large carbon isotope gradient and kinetic fractionation between surface and bottom waters during the mid-Ludfordian event in a strongly stratified basin. The Reda facies-isotope anomaly is regarded as undoubtedly globally triggered, but amplified by the stratified and euxinic conditions in the partly isolated, Baltic-Podolian basin. Hence, the common interpretation of the basin record as representative for the global ocean needs to be treated with great caution.
Źródło:: Acta Geologica Polonica; 2020, 70, 4; 529-567
0001-5709
Pojawia się w:: Acta Geologica Polonica
Dostawca treści:: Biblioteka Nauki

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