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Tytuł:
Petroleum geology of the Polish part of the Baltic region - an overview
Autorzy:
Pikulski, L.
Karnkowski, P. H.
Wolnowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/2059075.pdf
Data publikacji:
2010
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Baltic Region
petroleum geology
shale gas
Opis:
The Polish part of the Baltic region is located within the contact zone between two large geological units: the Precambrian platform and the Paleozoic platform. It comprises the Polish sector of the southern Baltic Sea and the adjacent onshore part of Northern Poland (Western and Eastern Pomerania). The fundamental geological pattern is defined by the Teisseyre-Tornquist Zone, separating the East European Craton from the Paleozoic platform. As a result of exploration activity in the onshore Pomerania region, four oil fields in Cambrian sandstones, seven gas fields in Carboniferous sandstones, six gas fields in Rotliegend sandstones, and eleven oil fields within the Zechstein Main Dolomite horizon have been discovered. The petroleum play of the southern Baltic Sea region and adjacent areas must be considered separately for Eastern and Western Pomerania. In the Peribaltic Syneclise we can only take into consideration organic matter appearing in lower Paleozoic rocks but their geothermal history refers to the period from the Vendian up to the recent. The present extent of the "oil window" in the Upper Cambrian rocks is mainly restricted to the offshore area. Reservoir properties of the "gas window" Cambrian rocks are rather low due to intensive diagenetic processes. Acquisition of gas should be possible by processes of hydraulic stimulation (tight gas). Lower Paleozoic rocks rich in organic matter (Ordovician and Silurian), especially in the border zone of the EEC (Ro >>gt; 1.3%), could be an area of unconventional gas fields (shale gas). The Western Pomerania petroleum play shows two separate source rocks units. The older one embraces Carboniferous deposits with organic matter of terrestrial origin and generated gases accumulated in the Rotliegend and Carboniferous traps. The second petroleum system is located within the carbonates of the Zechstein Main Dolomite (Ca2). This is a closed system, meaning that the source rocks are at the same time the reservoirs sealed by Zechstein evaporates. Hitherto discovered hydrocarbon deposits in the Polish part of the Baltic region have confirmed good perspectives regarding oil and gas hydrocarbon zones. New, conventional and unconventional discoveries remain possible.
Źródło:
Geological Quarterly; 2010, 54, 2; 143-158
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strategia poszukiwań złóż gazu ziemnego w łupkach
Shale gas exploration strategy
Autorzy:
Hadro, J.
Powiązania:
https://bibliotekanauki.pl/articles/2074762.pdf
Data publikacji:
2010
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
gaz niekonwencjonalny
gaz łupkowy
wiercenia poziome
stymulacja pęknięć
zasoby gazu łupkowego
wydobycie gazu
poszukiwania gazu łupkowego
ekonomika gazu łupkowego
unconventional gas
shale gas
horizontal drilling
fracture stimulation
shale gas resource
gas production
shale gas exploration
shale gas economics
Opis:
Unconventional gas by definition is economically less profitable and more difficult to extract then conventional gas. However, gradual depletion of conventional gas fields as well as large resources of unconventional gas make the latter an attractive target. Coalbed methane (CBM), tight gas and shale gas have been successfully developed in the US over the past two decades. Shale gas production has grown at the fastest pace in recent years and reached over 2 tcf in 2008, which is 6-fold increase since 1998. Key to success of unconventional gas development was Noncoventional Fuels Tax Credit introduced by the US government in 1980. This initial production growth of unconventional gas and shale gas in particular, was later sustained by the development of horizontal drilling and fracture stimulation technologies, economy of scale and increasing gas prices. Economics of producing shale gas is marked by bigger resource potential and, at the same time, lower production rates and higher drilling costs as compared to conventional gas, which entails adopting cautious investment strategies. Shale gas exploration strategies are also different from those of conventional gas and, initially, require an extensive source rock analysis and a big land position to identify "sweet spots". Shale gas exploration in Poland is in its infancy, being focused on the Silurian-Ordovician shale formation which is poorly explored and thus poses a significant exploration risk. Therefore, exploration companies have used a cautious approach which is reflected in planning of the concession activities divided in a few phases, with each successive phase contingent on the positive results of the preceding one. These phases include: existing data analysis, seismic, drilling an exploratory well with extensive core analyses prior to a pilot testing program using horizontal wells. On a technical level of shale gas exploration, the integration of many disciplines is required for commercial success. Potential barriers to shale gas exploration in Poland have been identified such as: regulations which are in favor of the domestic service companies impeding competition, changeable and unclear environmental protection regulations, as well as insufficient liberalization of the domestic gas market.
Źródło:
Przegląd Geologiczny; 2010, 58, 3; 250-258
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unconventional hydrocarbon resources of Greece
Autorzy:
Tsirambides, A.
Powiązania:
https://bibliotekanauki.pl/articles/2059636.pdf
Data publikacji:
2015
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
shale gas
methane hydrates
coal bed gas
Greece
Opis:
Intensive exploration of probable conventional hydrocarbon reservoirs in Greece is taking place, through the interpretation of seismic profiles and of abundant surface geological data. The unconventional hydrocarbon potential of the country is unknown, as detailed investigations are lacking. The most important rock formations which may contain shale gas are found in the land and offshore basins of northeastern, north-central, and western Greece. A re-evaluation of the data from all boreholes is needed, on the basis of new information, with the aim of identifying possible reserves of unconventional hydrocarbons retained in highly compacted fine-grained strata. Methane hydrates have been detected in the submarine Anaximander Mountains, east of Rhodes Island. They cover an area of about 46 km2 and the volume of methane is estimated at 2.6–6.4 trillion m3. The low content of the Greek lignites in gaseous hydrocarbons and the widespread tectonics in the Hellenic Peninsula are the main factors which prevented large gas accumulations in its 14 main coal deposits. However, additional research is needed to evaluate the coal-bed gas potential of the country.
Źródło:
Geological Quarterly; 2015, 59, 3; 479--490
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interpretacja i wizualizacja danych otworowych w utworach niższego paleozoiku obszaru kratonu wschodnioeuropejskiego i karbonu podłoża monokliny przedsudeckiej
Interpretation and visualization of well data in the lower Palaeozoic of the East European Craton and in the Carboniferous of the Fore-Sudetic Homocline basement
Autorzy:
Roman, M. G.
Powiązania:
https://bibliotekanauki.pl/articles/2075494.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
otwory wiertnicze
gaz łupkowy
tight gas
well logging
shale gas
Opis:
In order to determine the lithological complexes and to evaluate the prospective shale/tight gas zones, analysis of well data and a multi-well correlation have been performed. Over 30 wells were used for the analysis. Lithostratigraphic units have been verified and correlated in the wells. In some of them, TOC (Total Organic Carbon), effective porosity and lithological profiles have been determined after calibration with the laboratory analysis performed on core samples. Vast majority of the gathered data were visualized in 10 correlation lines.
Źródło:
Przegląd Geologiczny; 2016, 64, 12; 976--981
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyka petrofizyczno-mineralogiczna wyznaczonych perspektywicznych kompleksów węglowodorowych na podstawie wybranych wyników badań laboratoryjnych
Petrophysical and mineralogical characterization of prospective hydrocarbon complexes estimated based on selected laboratory research results
Autorzy:
Dyrka, I.
Powiązania:
https://bibliotekanauki.pl/articles/2075501.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
petrofizyka
mineralogia
gaz łupkowy
tight gas
porowatość
petrophysics
mineralogy
shale gas
shale porosity
Opis:
This article hasbeen prepared based on the chapter devoted to research of petrophysical properties of shale and tight sandstones within the project: “Identification of prospective zones for unconventional hydrocarbon accumulations in Poland, stage I.” Petrophysical and mineralogical characterization of particular prospective complexes in the Baltic, Podlasie-Lublin basin and the Carboniferous basin of south-western Poland (Fore-Sudetic Homocline basement), is based on selected laboratory tests of rocks, performed by the Oil and Gas Institute – NRI in Kraków. These analyses included investigations of total porosity and effective porosity, helium porosity, total permeability, silica content, clay content and cumulative content of quartz, and feldspars and carbonates. For particular complexes mean values of individual parameters were calculated. Then, an assessment was made to find out whether they meet the established criteria and whether the results correlate with each other in the boreholes across each area.
Źródło:
Przegląd Geologiczny; 2016, 64, 12; 982--986
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polskie złoża gazu ziemnego z łupków na tle wybranych niekonwencjonalnych złóż Europy Środkowo-Wschodniej
Polish shale gas deposits in relation to selected shale gas perspective areas of Central and Eastern Europe
Autorzy:
Karcz, P.
Janas, M.
Dyrka, I.
Powiązania:
https://bibliotekanauki.pl/articles/2075080.pdf
Data publikacji:
2013
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Europe
shale gas
shale oil
sedimentary basins
unconventional hydrocarbons
shale gas potential
Europa
gaz łupkowy
olej łupkowy
baseny sedymentacyjne
niekonwencjonalne węglowodory
potencjał gazu łupkowego
Opis:
This paper describes a regional overview of selected Central and Eastern European sedimentary basins which hold the unconventional potential for shale gas and shale oil exploration that have attracted interest in the last few years. Organic-rich fine-grained rocks like black and dark-grey shales, mudstones and claystones with varying ages from Cambrian to Miocene are distributed very irregularly across Europe. A long- -lasting, dynamic geological evolution and continuous reconstruction of the European continent resulted in the formation of many sedimentary basins. In some basins, biogeochemical conditions favoured preservation of accumulated organic-rich deposits and led to the generation of hydrocarbons after burial and reaching appropriate maturity levels. Even though shale gas and shale oil exploration in Europe is still in its infancy, shale formations were analyzed before as the source rocks in conventional petroleum systems. Parameters that were used to describe source rocks e.g.: total organic carbon, maturity, thickness, depth of occurrence and areal extent, can indicate preliminary potential for shale gas exploration and allow estimating first resource values. Currently the most intense shale gas exploration takes place in Poland where over 42 wells have been drilled and over 100 concessions for unconventional hydrocarbon exploration have been granted. Upper Ordovician and Lower Silurian shales at the East European Craton (Baltic and Lublin-Podlasie Basins) are the major targets for unconventional exploration in Poland. In Central and Eastern Europe, evaluation of the unconventional potential of gas-bearing shale formations is carried out also in Ukraine, Lithuania, Austria, Czech Republic, Hungary, Romania, Bulgaria, Moldavia and the European sector of Turkey. Despite the fact that each shale rock differs from another by geochemical, petrographical, petrophysical, mechanical and other parameters, some similarities can be seen such as marine type of depositional environment with the predominance of type II kerogen or specific organic matter content. Recoverable resources of shale gas throughout Europe are believed to be as large as 17.6 bln m3 and Poland, Ukraine, France with United Kingdom are thought to have the greatest resources.
Źródło:
Przegląd Geologiczny; 2013, 61, 7; 411--423
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polish shale gas deposits in relation to selected shale gas prospective areas of Central and Eastern Europe
Autorzy:
Karcz, P.
Janas, M.
Dyrka, I.
Powiązania:
https://bibliotekanauki.pl/articles/2075024.pdf
Data publikacji:
2013
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Europe
shale gas
shale oil
sedimentary basins
unconventional hydrocarbons
shale gas potential
Europa
gaz łupkowy
olej łupkowy
baseny sedymentacyjne
niekonwencjonalne węglowodory
potencjał gazu łupkowego
Opis:
This paper describes a regional overview of selected Central and Eastern European sedimentary basins which hold the unconventional potential for shale gas and shale oil exploration that have attracted interest in the last few years. Organic-rich fine-grained rocks like black and dark-grey shales, mudstones and claystones with varying ages from Cambrian to Miocene are distributed very irregularly across Europe. A long- -lasting, dynamic geological evolution and continuous reconstruction of the European continent resulted in the formation of many sedimentary basins. In some basins, biogeochemical conditions favoured preservation of accumulated organic-rich deposits and led to the generation of hydrocarbons after burial and reaching appropriate maturity levels. Even though shale gas and shale oil exploration in Europe is still in its infancy, shale formations were analyzed before as the source rocks in conventional petroleum systems. Parameters that were used to describe source rocks e.g.: total organic carbon, maturity, thickness, depth of occurrence and areal extent, can indicate preliminary potential for shale gas exploration and allow estimating first resource values. Currently the most intense shale gas exploration takes place in Poland where over 42 wells have been drilled and over 100 concessions for unconventional hydrocarbon exploration have been granted. Upper Ordovician and lower Silurian shales at the East European Craton (Baltic, Lublin and Podlasie basins) are the major targets for unconventional exploration in Poland. In Central and Eastern Europe, evaluation of the unconventional potential of gas-bearing shale formations is carried out also in Ukraine, Lithuania, Austria, Czech Republic, Hungary, Romania, Bulgaria, Moldova and the European sector of Turkey. Despite the fact that each shale rock differs from another by geochemical, petrographical, petrophysical, mechanical and other parameters, some similarities can be seen such as marine type of depositional environment with the predominance of type II kerogen or specific organic matter content. Recoverable resources of shale gas throughout Europe are believed to be as large as 17.67 trillion m3 (624 Tcf) and Poland, Ukraine, France with United Kingdom are thought to have the greatest resources.
Źródło:
Przegląd Geologiczny; 2013, 61, 11-1; 608--620
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Rola geofizyki wiertniczej w określeniu zasobów gazu ziemnego w łupkach
Application of wire log analysis for petrophysical evaluation and determination of shale gas reserves
Autorzy:
Drop, K.
Kozłowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2074763.pdf
Data publikacji:
2010
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
gaz łupkowy
interpretacja geofizyki wiertniczej
łupki
shale gas
petrophysical interpretation
Silurian Shale
Opis:
The paper presents differences between conventional and shale gas plays (Tab. 1). Shale gas concept comprises a wide range of reservoirs, from the coalbed to tight gas plays. In Europe, where the shale gas rush has just started, shaly rocks were treated so far as unproductive and high quality data sets necessary for evaluating properties of those rocks are usually missing. Therefore, US shale gas plays like Barnett and Haynesville are widely used as valuable reference tools (Jacobi, 2008; Parker, 2009). Coal, where gas is essentially stored entirely by sorption, represents one end of the unconventional gas spectrum and tight gas sands, where gas is essentially stored by compression only - the other end of that spectrum. In turn, shale reservoirs with gas entrapped by sorption and compression, fill the space between the two endpoints. Differentiation of those two components is one of the primary goals of an analysis program. Shale gas reservoirs are formed by a wide variety of rock types which makes it necessary to use most appropriate technologies to characterize both coalbed and tight gas reservoirs. The current paper concentrates on tools for evaluating petrophysical parameters, most suitable for shale gas plays. In the case of old wells with old fashion Soviet logs, the uncompensated neutron gamma tool was commonly used tool. This was the only porosity reading curve in log suite, "neutron porosity curve" which could be overlaid with natural gamma ray (GR) (Fig. 1). Natural gamma ray curve is a good indicator of organic matter, which adsorbed uranium. Other hydrocarbon signatures can be traced on the basis of SP vs GR, GR vs resistivity. Some of hydrocarbon signatures can be related to TOC from core lab measurements. For contemporary good quality wire line log curves the Passey et al. (1990) method has been applied. This method is based on computation of separation between acoustic transit time and resistivity (R) (Fig. 2). The resulting difference is used to calculate TOC taking into consideration maturity of organic matter which is parameter for a bunch of relationships (TOC vs R). Local calibration R to TOC from cores are required. In order to determine reliable relationships between R, gas contents to TOC, the high technology coring service and sensitive laboratory measurements are necessary. The results of petrophysical analyses are important for estimations of gas resources in shales. The formulas for computation of conventional and unconventional gas reserves are generally similar. However, in the case of the unconventional gas reserves, instead of porosity reservoir storage the rock density is applied, and for determinations of hydrocarbon volume-the gas content is applied in place of hydrocarbon saturation. If European unconventional reservoirs turn to be profitable then continent landscape will also change. The big gas fields would require dense networks of rigs that will have some negative environmental impact. This would require a change in industry structure, as well as in public opinion and legal regulations.
Źródło:
Przegląd Geologiczny; 2010, 58, 3; 263-265
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Silurian shales of the East European Platform in Poland : some exploration problems
Autorzy:
Porębski, S.J.
Prugar, W.
Zacharski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2075023.pdf
Data publikacji:
2013
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Silurian
black shale
shale gas
unconventional play
czarne łupki
gaz łupkowy
niekonwencjonalna gra
Opis:
The pericratonic Silurian shale succession in Poland, despite its reasonably well-constrained geological framework, entails a number of contentious issues that need to be resolved before this emerging shale gas play will enter a stage of successful development. The succession is thought to have originated in a Caledonian foredeep encroaching distally onto a pericratonic shelf ramp. However, the geochemical signature of the mudrocks is consistent with a cratonic rather than orogenic sourcing, the proximal part of the foredeep basin-fill is apparently missing, and the shale succession juxtaposes in part across the Teisseyre-Tornquist Zone against suspected terranes with no evidence of Silurian tectonism. Organic-rich Llandovery– Wenlock shales form a NW-SE striking central belt that is increasingly calcareous toward the craton (NE) and more silty toward the inferred orogen (SW), with the TOC content decreasing in both directions perpendicular to the strike. The TOC trend seems consistent with the deep-downlap model of black shale deposition suggested for many Paleozoic foredeep basins, but does not quite agree with the outer neritic to upper bathyal depths assumed for the shale deposition. Preliminary results from three wells drilled by Orlen Upstream in the Lublin Basin indicate that the Llandovery–Wenlock shales were deposited on a distal shelf ramp sheltered from the craton by shelf carbonate shoals and periodically affected by weak storm-generated currents. The impact of storms on water column resulted in intermittent rises of oxygen content in the otherwise anoxic to dysoxic near-bottom conditions. The prospective interval is dominated by calcite-cemented clayey mudstones showing moderate to good reservoir qualities. It is cut locally by ENE- or NE-dipping, steep fractures favourable for fluid transmissibility, and a NE or SWdirection is most advantageous for artificial fracturing. This interval is capped with a Ludlow calcite-cemented, laminated siltstone that forms a regional correlation marker and shows soft-sediment deformations attributable to gravitational collapse on a NE-dipping paleoslope. If correct, this interpretation might imply the encroachment of orogen-fed clinothem system onto the SW-inclined craton-margin shelf ramp.
Źródło:
Przegląd Geologiczny; 2013, 61, 11-1; 630-638
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Łupki sylurskie platformy wschodnioeuropejskiej w Polsce : wybrane problemy poszukiwawcze
Silurian shales of the East European Platform in Poland : some exploration problems
Autorzy:
Porębski, S.J.
Prugar, W.
Zacharski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2075081.pdf
Data publikacji:
2013
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Silurian
black shale
shale gas
unconventional play
sylur
ciemne łupki
gaz łupkowy
niekonwencjonalna gra
Opis:
The pericratonic Silurian shale succession in Poland, despite its reasonably well-constrained geological framework, entails a number of contentious issues that need to be resolved before this emerging shale gas play will enter a stage of successful development. The succession is thought to have originated in a Caledonian foredeep encroaching distally onto a pericratonic shelf ramp. However, the geochemical signature of the mudrocks is consistent with a cratonic rather than orogenic sourcing, the proximal part of the foredeep basin-fill is apparently missing, and the shale succession juxtaposes in part across the Teisseyre-Tornquist Zone against suspected ter- ranes with no evidence of Silurian tectonism. Organic-rich Llandovery-Wenlock shales form a NW-SE striking central belt that is increasingly calcareous toward the craton (NE) and more silty toward the inferred orogen (SW), with the TOC content decreasing in both directions perpendicular to the strike. The TOC trend seems consistent with the deep-downlap model of black shale deposition suggested for many Paleozoic foredeep basins, but does not quite agree with the outer neritic to upper bathyal depths assumed for the shale deposition. Preliminary results from three wells drilled by Orlen Upstream in the Lublin Basin indicate that the Llandovery-Wenlock shales were deposited on a distal shelf ramp sheltered from the craton by shelf carbonate shoals and periodically affected by weak storm-generated currents. The impact of storms on water column resulted in intermittent rises of oxygen content in the otherwise anoxic to dysoxic near-bottom conditions. The prospective interval is dominated by calcite-cemented clayey mudstones showing moderate to good reservoir qualities. It is cut locally by ENE- or NE-dipping, steep fractures favourable for fluid transmissibility, and a NE or SW direction is most advantageous for artificial fracturing. This interval is capped with a Ludlow calcite-cemented, laminated siltstone that forms a regional correlation marker and shows soft-sediment deformations attributable to gravitational collapse on a NE-dippingpaleoslope. If correct, this interpretation might imply the encroachment of orogen-fed clinothem system onto the SW-inclined craton-margin shelf ramp.
Źródło:
Przegląd Geologiczny; 2013, 61, 8; 468--477
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The estimation of CO2 storage potential of a gas-bearing shale succession at the early stage of reservoir characterization : a case study from the Baltic Basin (Poland)
Autorzy:
Wójcicki, Adam
Jarosiński, Marek
Roman, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2058853.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
carbon dioxide
storage capacity assessment
shale gas reservoir
sorption
pores
fractures
Opis:
Estimation of the CO2 storage potential of gas-bearing shales in the Lower Paleozoic Baltic Basin is at an early stage of reservoir exploration and production, based on data from one vertical exploration borehole, supplemented with some information from adjacent boreholes. The borehole section examined is 120 m long and comprises three intervals enriched with organic matter separated by organic-poor intervals. In our approach, the storage capacity is represented by: (1) sorption potential of organic matter, (2) open pore space and (3) potential fracture space. The potential for adsorbed CO2 was determined from Langmuir isotherm parameters taken from laboratory measurements and recalculated from CH4 adsorption curves. The pore space capacity was estimated in two ways: by utilizing results of laboratory measurements of dynamic capacity for pores >100 nm and using results of helium porosimetry, the first of these being considered as the most relevant. Due to the low permeability of the shale matrix we have adopted the standard assumption that the CO2 is able to reach effectively only 10% of the theoretical total sorption and pore volume. For hydraulic fracture space, the theoretical maximum opening of vertical fractures in the direction of minimum horizontal stress was considered, decreased by the expected portion of fracturing fluid flowback and by partial fracture closure by burial compaction. The effectiveness of three CO2 storage categories for the individual organic-rich and organic-poor shale units shows an obvious positive correlation of TOC content with the storage efficiency by sorption and within pore space, and a negative correlation with the storage efficiency in hydraulic fractures. It was estimated that sorption, over the maximum storage interval (120 m thick), is responsible for ~76% of total storage capacity, pore space accounts for 13% (for the most relevant porosity model) while the contribution of fractures is about 11%. In the minimum storage interval (35 m thick, including the best quality shales) the estimated proportions of sorption, pore space and fractures in the total storage capacity are 84, 10 and 6% respectively. Finally, the result for the best quality storage interval (35 m thick) was compared with the Marcellus Shale of similar thickness (average ~38 m) and with other options of CO2 storage in Poland. The most organic-rich units in the area studied have a CO2 storage capacity efficiency (i.e. storage capacity per volume unit of shale) only slightly less than average for the Marcellus Shale, because sorption capacity – the dominant component – is comparable in both cases. However, the open pore space capacity in the Marcellus Shale appears to be far higher, even if the potential fracture space calculated for the borehole studied is taken into consideration, probably because the free gas content in the Marcellus Shale is far higher than in the Baltic Basin. CO2 storage in depleted shale gas wells is not a competitive solution compared to storage in saline aquifer structures or in larger hydrocarbon fields.
Źródło:
Geological Quarterly; 2021, 65, 1; 3
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Niemiecki projekt zmiany przepisów w Prawie Wodnym i Prawie Ochrony Środowiska dotyczących zakazu szczelinowania hydraulicznego i monitoringu ryzyka : implikacje do wydobycia gazu z łupków
The draft of changes in theWater Law and the Environmental Law in Germany, regarding prohibition of hydraulic fracturing and risk monitoring: implications to the shale gas extraction
Autorzy:
Mamczar, M.
Jędrysek, M. O.
Powiązania:
https://bibliotekanauki.pl/articles/2075341.pdf
Data publikacji:
2015
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
gaz łupkowy
prawo
szczelinowanie
gaz niekonwencjonalny
shale gas
law
hydraulic fracturing
unconventional gas
Opis:
In Germany there is no agreement among politicians and local government officials regarding the safety and economic sense of the exploration and production of shale gas. However Germany does not reject completely the need to invest in the development of this sector. The political parties speak cautiously about the hydraulic fracturing, because they do not want to lose their voters. However, in a country which is in 70% dependent on the import of natural resources, the industry interest in the search for alternatives to Russian gas and oil energy sources increases. It is no secret that after the withdrawal from nuclear power, the German economy has to change its energy profile. Currently, Germany increases the use of coal, but could it have economic sense? Because of green certificates and European trend to reduce the emission of CO2, the Germans do not depart from the investment in shale gas. It is confirmed by the publication of a draft of amending the acts in November 2014. However some part of German society expected much more strict rules, including a total ban on hydraulic fracturing. The German law should, mobilize the Polish Parliament (Sejm) to develop a comprehensive law regulating the mining and geological activity that is in line with EU law.
Źródło:
Przegląd Geologiczny; 2015, 63, 7; 391--396
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Podstawy metodyki poszukiwań, rozpoznawania i dokumentowania zasobów złóż w odniesieniu do złóż gazu ziemnego w łupkach gazonooenych
Backgrounds of prospecting, exploration and reporting resources and reserves of shale gas deposits
Autorzy:
Nieć, M.
Powiązania:
https://bibliotekanauki.pl/articles/2075159.pdf
Data publikacji:
2014
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
shale gas deposits
prospecting
exploration
resources
reserves
złoża gazu łupkowego
zasoby
rezerwy
Opis:
Gas in shales occurs as a constituent of rock and its resources can be estimated in a similar way as the metal content in ore deposit. The cutoff gas content in rock is the basic parameter defining deposit boundaries. It is proposed that the cutoffs in gas-bearing rocks are 2 m3 gas/t and 15-m deposit thickness. In case of lack of sufficient data, the deposit boundaries for resources estimation may be delineated in a defined distance from prospecting boreholes, supported by geophysical data, if possible. Discovered gas resources may be evaluated by volumetric methods. For reserve estimation, dynamic methods should be applied based on shale fracturing results. Following the stages of prospecting and exploration, decreasing uncertainty of the deposit resources/reserves evaluation may be expressed by D, C, B and A categories, or with the use of PRMS classification system.
Źródło:
Przegląd Geologiczny; 2014, 62, 8; 403--413
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza możliwości wykorzystania wód podziemnych na potrzeby eksploatacji gazu z formacji łupkowych na obszarze objętym pracami poszukiwawczo-rozpoznawczymi
Analysis of the possibility of using groundwater for the gas exploitation from shale formations in the area covered by the exploration work
Autorzy:
Mikołajków, J.
Nidental, M.
Woźnicka, M.
Powiązania:
https://bibliotekanauki.pl/articles/2075448.pdf
Data publikacji:
2015
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
gaz łupkowy
szczelinowanie
zasoby wód podziemnych
shale gas
hydraulic fracturing
groundwater resources
Opis:
Exploitation of unconventional gas requires the use of hydraulic fracturing in horizontal wells’ network, which allows the penetration of deposits over a large area. Despite the research to find innovative solutions, presently hydraulic fracturing is carried out using a fracturing fluid prepared on basis of water. The use of hydraulic fracturing on exploitation’s scale of unconventional gas (several horizontal wells at a single location) requires ensuring access to a large amount of water in a relatively short period of time. Analysis of possibilities of using of groundwater in areas of exploration and exploratory work is necessary at an early stage investment planning and should be one of the key factors determining the possibility of exploitation in the area. In this paper was carried out a variant analysis of the availability of groundwater resources in terms of their use for the purpose of exploitation.
Źródło:
Przegląd Geologiczny; 2015, 63, 10/2; 944--949
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 47

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