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Tytuł:
Metamorphic conditions of the omphacite-garnet gneiss from Otrøy, Western Gneiss Region, Scandinavian Caledonides
Autorzy:
Holmberg, J.
Majka, J.
Klonowska, I.
Powiązania:
https://bibliotekanauki.pl/articles/184242.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
crustal rock
terranes
continental rock
Opis:
The Western Gneiss Region (WGR) is one of the Earth’s most studied ultra-high pressure (UHP) terranes. It consists of continental crustal rocks that host e.g. coesite-bearing eclogites and diamond-bearing garnet-pyroxenites. These self-evident high pressure lithologies naturally attract most of the attention, whereas their host rocks are not studied in much detail. In this study we examined, eclogite- and peridotite-hosting, garnet-omphacite gneisses from the island of Otrøy situated in the WGR (Norway, Scandinavian Caledonides), to deliver pressure-temperature conditions of their formation. High pressure mineral assemblage including e.g. omphacite and phengite together with assumed pseudomorphs after coesite located in omphacite and garnet suggest formation of the studied rocks under ultrahigh pressure metamorphic (UHP) conditions. However, geothermobarometry based on (a) the garnet-clinopyroxene Fe-Mg exchange reaction and (Ravna 2000), and (b) the net-transfer reaction 6 diopside + 3 muscovite = 3 celadonite + 2 grossular + pyrope (Ravna & Terry 2004) yielded pressure-temperature conditions of c. 880°C and 2.2 GPa, characteristic for just high pressure metamorphism, but not in the stability field of coesite (hence not UHP conditions). It might be an effect of partial re-equilibration of the mineral system used for geothermobarometry. Such re-equilibration could have happened during the decompression stage, which followed the metamorphic peak. Therefore alternative pressure-temperature estimates using e.g. phase equilibrium thermodynamic modeling or Raman band shift based geothermobarometry are needed to cross-check the results obtained using the conventional technique. Nevertheless, it is already evident that the Otrøy gneisses were formed due to the deep subduction of continental crust during the Scandian collision between the continents Baltica and Laurentia that resulted in the final closure of the Iapetus Ocean in the early Devonian.
Źródło:
Geology, Geophysics and Environment; 2016, 42, 1; 75
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ludwigite-group minerals and szaibelyite: rare borate minerals from Vysoká – Zlatno skarn, Štiavnica stratovolcano, Slovakia
Autorzy:
Bilohuscin, V.
Uher, P.
Powiązania:
https://bibliotekanauki.pl/articles/184418.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
sedimentary rock
evaporitic rock
temperature
Opis:
Beside of sedimentary evaporitic rocks, borate minerals occur also in some high temperature contact-metamorphic rocks, especially in skarns, locally in association with Fe and Sn ore minerals (e.g., Anovitz & Grew 1996). The borate minerals are generally associated with the post-magmatic processes which occur in the contact aureoles of intrusive, acid to intermediary, calc-alkaline rocks (Pertsev 1991). Borate minerals of the ludwigite group and szaibelyite were identified from the Mg-skarn in the R-20 drilling core in depth of 1172 m during geological exploration for Cu- Au porphyry-skarn ores in the Vysoká – Zlatno area near Banská Štiavnica, in the Štiavnica Neogene stratovolcano, central Slovakia (Koděra et a l. 2010). Ludwigite-group minerals (LGM) form massive black aggregates (>5 cm large) of numerous acicular, euhedral to subhedral prismatic crystals (usually 0.2–3 mm long). Ludwigite associates with clinohumite, szaibelyite, clinochlore, serpentine-group mineral, magnesite, dolomite, hematite, rarely valeriite, chalcopyrite, and sphalerite. Under transmitted light, LGM crystals are mostly opaque; locally they are translucent with strong pleochroism in sections parallel to Z-axis (deep green – dark reddish brown). In BSE, LGM crystals show regular concentric, rarely oscillatory or irregular zoning caused by distinct element variations during their growth or partial alteration: the dark zones show enrichment in Mg, Al and Ti, in contrast to the pale zones which reveal larger amounts of Fe. The electron-microprobe analyses reveal growth evolution of LGM crystals from Al- rich azoproite with ≤ 79 mol.% of Mg 2 (Mg 0.5 Ti 0.5 ) (BO 3 )O 2 end-member] to Al ± Ti-rich ludwigite and Al-dominant LGM phase [“aluminoludwigite” with ≤ 53 mol.% of Mg 2 Al(BO 3 )O 2 end-member] in central zones, whereas rim zones of the crystals and secondary veinlets attain nearly pure ludwigite composition [87–99 mol.% of Mg 2 Fe 3+ (BO 3 )O 2 end-member]. Consequently, LGM from the Vysoká – Zlatno skarn show the largest composition al variations ever known from one occurrence and they reach the highest contents of Ti ( ≤ 17.4 wt.% TiO 2 , 0.39 apfu ) and Al ( ≤ 14.4 wt.% Al 2 O 3 , 0.53 apfu ) ever reported in LGM (Schaller & Vlisidis 1961, Marincea 2000, Pertsev et al. 2004, Aleksandrov & Troneva 2008, 2011). The compositional variations indicate the following substitution mechanisms in the studied LGM: Mg 2+ = Fe 2+ for the all compositions, Fe 3+ = Al 3+ for samples without higher amount of Ti, and 2Al = Mg 2+ + Ti 4+ or 2Fe 3+ = Mg 2+ + Ti 4+ for analyses including high Ti content. Szaibelyite MgBO 2 (OH) occurs as aggregates of fibrous crystals, up to 0.5 mm in size, replacing LGM. Zoning in szaibelyite was not observed. The amounts of Mg are uniform (0.98 to 0.99 apfu ), content of Fe 2+ oscillates from 0.2 to 1.2 wt.% FeO (0.002–0.014 apfu ) and indicates the Mg 2+ = Fe 2+ substitution. Szaibelyite also contains small ad mixtures of Mn (0.1–0.4 wt.% MnO), Al and Cr ( ≤ 0.3 wt.% Al 2 O 3 or Cr 2 O 3 ). The skarn mineralization originated as a result of contact thermal metamorphism of Miocene calc-alkaline granodiorite intrusion on host Middle to Upper Triassic limestones, dolomites, shales and evaporitic anhydrite beds (the Veľký Bok Group, Veporicum Unit). The evaporites were most likely the primary source of boron, where as Ti was probably derived from the granodiorite. Clinohumite and LGM (azoproite to Al ± Ti-rich ludwigite and “aluminoludwigite”) precipitated during the high-temperature contact metamorphic event at ~ 700°C and ≤ 100 MPa, whereas the youngest Al,Ti-poor ludwigite veinlets, szaibelyite, serpentine-group mineral, clinochlore, magnesite, dolomite, hematite and probably also sulfide minerals were formed during younger, lower-temperature hydrothermal-metasomatic event.
Źródło:
Geology, Geophysics and Environment; 2016, 42, 1; 59-60
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tightness of hydrogen storage caverns in salt deposits
Autorzy:
Ślizowski, J.
Smulski, R.
Nagy, S.
Burliga, S.
Polański, K.
Powiązania:
https://bibliotekanauki.pl/articles/299145.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
rock salt
tightness of rock salt
hydrogen storage
Opis:
The problem of rock salt massif tightness concerns all stored media. It is particularly important in the case of hydrogen, because of the small size of its molecules. Preliminary results of selected permeability tests performed under the project Hestor are discussed in the paper. The results of numerical calculations determining a potential range of gas leakage are also presented.
Źródło:
AGH Drilling, Oil, Gas; 2017, 34, 2; 397-409
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Department of Mineralogy, Petrography and Geochemistry
Autorzy:
Matusik, J.
Rzepa, G.
Powiązania:
https://bibliotekanauki.pl/articles/184452.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
chemistry
rock
origin
Źródło:
Geology, Geophysics and Environment; 2016, 42, 2; 218-222
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tectonic strain in salt rock mass based on measurements
Autorzy:
Szczerbowski, Zbigniew
Niedbalski, Zbigniew
Bednarek, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/27310152.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
rock salt
tectonic stress
convergence
rock strain
extensometers
numerical modelling
Opis:
The measurement method with the application of an extensometer for the detection of the manifestation of tectonic strain is presented in this paper. The instrument is operated in underground construction for engineering purposes, and the authors applied it in a deeply placed underground old mine gallery in the Bochnia Salt Mine, just at the tectonic boundary of the Outer Carpathians which is commonly considered to be a tectonically active zone. The presented study is characterized by two basic features. The first is the placement of the measurements deep in an old mine which is an environment free of atmospheric factors disturbing the detection of a tectonic signal. The second is a combination of routine measurements carried out for engineering purposes and research measurements enabling the extension of the observation of displacements in the space outside underground workings, inside the rock mass that has been penetrated by extensometer probes. The extensometric measurements have been made using three 7-meter long sections. The results showed the differentiation in the displacement rates of points placed in the side walls: in the southern profile, the annual displacements are approximately 1.5 mm and in the northern one – approximately 1 mm. The combined result corresponds to the amount of the annual convergence value which has been determined by the classical surveys in the excavation where extensometric measurements have been made. What is more, the ongoing displacements in the southern side wall involve the entire part of the rock mass which is penetrated by an extensometric probe, but the displacements in the northern side are only observed in the first 2 m of the penetrated part of the rock mass. This differentiation is interpreted by the authors as being the result of tectonic strain acting from the south exerted by the Carpathians.
Źródło:
Geology, Geophysics and Environment; 2023, 49, 2; 157--173
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Manganese oxides from Zalas, Kraków area, southern Poland
Autorzy:
Polak, M.
Gołębiowska, B.
Rzepa, G.
Powiązania:
https://bibliotekanauki.pl/articles/184692.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
intrusion
volcanic rock
limestone
Opis:
The Zalas quarry is located in the southern, marginal part of the Silesian-Cracovian Monocline. Permian rhyodacite laccolith has been exploited here for over 70 years. The intrusion was formed about 260–280 Ma during the Early Permian transtensional, sinistral tectonic regime predominating in central Europe at that time (Nawrocki et al. 2005). Permian volcanic rocks are overlain by a Middle–Upper Jurassic sedimentary sequence, built from sands and sandstones, substituted with the passing of time by limestones and sandy limestones rich in fossils (Matyszkiewicz et al. 2006). Quarrying operations carried out approximately 10 years ago uncovered a fault zone cutting the Middle Jurassic sandy limestones. Exposed breccias was locally encrusted by a hydrothermal mineralization forming thin veinlets cutting the limestone, or surrounding the breccia clasts. Primary mineralization contained small relics of pyrite, chalcopyrite, chalcocite, galena, native bismuth and barite and was significantly replaced by supergene minerals e.g. Fe and Mn oxides, malachite, cuprite, Cu sulphates, iodargyrite, Bi oxychlorides and Na, K chlorides (Gołębiowska et al. 2006, 2010, 2015). The mineralization is most likely connected with rejuvenation of Early-Paleozoic fault zones during the Sava phase of the Alpine orogeny, and subsequent intensive weathering under semi-arid and arid climate in a period between the Oligocene and Middle Miocene (Gołębiowska et al. 2010). In the sandy limestone encrusted by the oxidized mineralization, very interesting Mn-oxides, enriched in numerous heavy metals were encountered. They filled small fractures and voids within the fault breccia. Among them, Tl-rich varieties have been recently reported. Extremely high thallium content, reaching 20.82 wt% Tl 2 O, makes the oxides unique on a world scale (Gołębiowska et al. 2015). In this paper we focused on the variable admixtures in Mn oxides from oxidation zone in Zalas; for this purpose, SEM-EDS and WDS analyses were carried out. Mn oxides in Zalas are accompanied by malachite, Fe oxides (goethite and hematite) and relics of primary mineralization (Matyszkiewicz et al. 2015). Mn and Fe oxides commonly form the yellowish to red-brownish or black tiny grains or cryptocrystalline aggregates with sizes up to a few millimetres across. Manganese oxides contain variable admixtures of Cu, Ca, Pb, Ba, Fe, Ni, Co and Tl. On the basis of chemical analyses, three major Mn oxide types have been distinguished: those enriched in (i) Ni and Co, (ii) Pb and (iii) Ba and Ca. Co-Ni-bearing Mn oxides, probably asbolane-type, contain 17.01–21.58 wt% CoO and 3.05–8.33 wt% NiO. These phases contain also admixtures of Cu (up to 10 wt% CuO) and Al (up to 7 wt% of Al 2 O 3 ), as well as traces of Fe, Ba, Zn, Mg and Tl (up to 0.5 wt%). Interestingly, in Mn oxides of this type, the admixtures of lead are absent. Pb-bearing Mn oxide, probably coronadite, contain up to 21.48 wt% PbO. In its composition various other elements were also noticed: up to 2 wt% CoO, 0.4 wt% NiO and very high concentrations of CuO up to 8 wt%, as well as up to 1 wt% BaO, FeO, CaO Tl 2 O, Al 2 O 3 and traces of Zn and Mg. Chemical mapping indicates that the Ba- or Ca-bearing Mn oxides occur only in marginal parts of zoned MnO 2 aggregates with almost pure MnO 2 in their cores. They contain 78–84 wt% MnO 2, 3–10 wt% BaO and 2.5–4.5 wt% CaO. High contents of Co, Ni, Pb, Cu and Tl in Mn oxides from Zalas indicate a direct link with the primary ore assemblage. High concentration of cobalt and nickel might suggest some connection with Co and Ni mineralization known from nearby Karniowice Travertine (Czerny 1992). Mineral association, as well as crystal morphologies and sizes could indicate hydrothermal origin of at least part of the Mn oxides. However, identification of the particular minerals as well as concluding on the details of their origin is quite difficult on this stage of research.
Źródło:
Geology, Geophysics and Environment; 2016, 42, 1; 120-121
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the stress strain of rock massif in the crooked wellbore
Autorzy:
Chernova, M, YE
Kuntsyak, Y. V.
Powiązania:
https://bibliotekanauki.pl/articles/298955.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
borehole
stress
drilling
rock
Opis:
We investigated the stressed-deformed state of rock mass in a deviated borehole. There were received the analytical dependencies for the determination of circular and radial stress that allows for a science-based approach to the design of a borehole profile during the drilling process in the uneven horizon of rock mass of such reservoirs as Dnipro-Donetsk Depression and Black Sea Shelf and the construction of hydroacoustic directional energy devices with controlled parameters.
Źródło:
AGH Drilling, Oil, Gas; 2014, 31, 4; 507-512
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metoda oceny jakości wklejenia żerdzi kotwiowych w górotworze jako skuteczny sposób kontroli stanu bezpieczeństwa pracy w wyrobiskach korytarzowych
Method for identification of grouting continuity of rock bolts as an efficient way to control safety conditions in mine roadways
Autorzy:
Staniek, A.
Powiązania:
https://bibliotekanauki.pl/articles/350335.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
górotwór
żerdź kotwiowa
metoda
analiza modalna
rock mass
rock bolting
method
modal analysis
Opis:
Samodzielna obudowa kotwiowa lub obudowa podporowa wzmacniana kotwiami jest podstawowym elementem zapewniającym bezpieczeństwo pracy w wyrobiskach korytarzowych w podziemiach zakładów górniczych. Zasadniczy element obudowy kotwiowej - żerdź kotwiowa, która jest wklejona do górotworu - może nie być wklejona na całej swej długości. Może być to następstwem ruchu górotworu lub nieprawidłowego wklejenia żerdzi. Stwarza to poważne niebezpieczeństwo dla pracy załogi i może skutkować zawaleniem stropu. W artykule przedstawiono metodę identyfikacji nieciągłości wklejenia żerdzi kotwiowych w górotworze. Metoda realizowana jest z wykorzystaniem eksperymentalnej analizy modalnej, składa się zasadniczo z dwóch części: właściwej identyfikacji parametrów modalnych badanego układu mechanicznego żerdź - klej - górotwór dla różnych warunków brzegowych odpowiadających różnym przypadkom nieciągłości wklejenia i odniesienia otrzymanych wyników do utworzonej bazy danych - wyniki teoretycznej analizy modalnej - otrzymanych dla zwalidowanego modelu elementów skończonych badanego układu mechanicznego i uwzględniającego różne typy skał i różne przypadki nieciągłości wklejenia.
A rock bolt which is grouted underground may not be properly inserted with the result of discontinuity of resin layer. Such discontinuity may also occur in working conditions due to typical rock behavior and displacement. It may be very hazardous to mine safety. In this paper a method for non-destructive identification of discontinuity of a resin layer surrounding rock bolt is presented. The method used modal analysis procedures and is based on an impact excitation where a response transducer is positioned at a visible part of a rock bolt. As an installed rock bolt acts as an oscillator, different length of discontinuity of resin layer changes its modal parameters. By proper extraction of these parameters, from which a resonant frequency is seen as most valuable, the intended identification is possible. Also the results of research work concerning influence of explosions on installed rock bolts are presented. The investigated rock bolts were localized in a coal mine roadway near the region of explosions of dynamite charge. The test were performed before and after the explosions. The usage of the method was tested in copper mines as well.
Źródło:
Górnictwo i Geoinżynieria; 2007, 31, 3/1; 507-522
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza porównawcza schematów kotwienia tunelu metodą stochastycznej symulacji stateczności bloków
Comparative analysis of rockbolt pattern in tunnel by stochastic simulation of blocks stability
Autorzy:
Jakubowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/350530.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
mechanika skał
teoria bloków
blokowy masyw skalny
obudowa kotwowa
stateczność wyrobisk
metody probabilistyczne mechaniki skał
symulacja stochastyczna
rock mechanics
block theory
blocky rock mass
rock bolting
stability of rock excavations
probabilistic methods in rock mechanics
stochastic simulation
Opis:
W artykule przedstawiono niektóre wyniki porównawczej analizy schematów kotwienia dla warunków tunelu pod Atlantą. Zastosowano metodę stochastycznej symulacji stateczności bloków (MSB), która wykorzystuje mechaniczny model zmodyfikowanej teorii bloków w schemacie Monte Carlo oraz przyjęty stochastyczny model sieci nieciągłości. Przeprowadzono serię symulacji opartych na pomiarach sieci nieciągłości i zaobserwowanych warunkach geologicznych. Wybrane miary stateczności wyrobiska posłużyły do porównania schematów kotwienia dla każdego z 14 odcinków tunelu.
Paper presents comparative analysis of rockbolt pattern for the conditions of overflow sewer storage tunnel in Atlanta. For the tunnel stability assessment the stochastic simulation of block stability method (MSB) was applied. The method incorporates modified block theory stability analysis within Monte Carlo simulation scheme and stochastic model of discontinuity network. A series of simulations for 3 rockbolt patterns and 14 tunnel intervals has been performed. For each set of data, results describe tunnel stability measures in the means of statistics and probabilities.
Źródło:
Górnictwo i Geoinżynieria; 2011, 35, 2; 303-311
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected effects of VTI anisotropy on downhole microseismic data
Autorzy:
Święch, E.
Pasternacki, A.
Maćkowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/184563.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
shale gas
sedimentary rock
petroleum
Opis:
Shale gas is one of the well-known unconventional resources of natural gas all over the world. This term refers to natural gas that is trapped within shale formations. Shales are fine – grained sedimentary rocks which can be reach resources of both petroleum and natural gas. This sedimentary rocks are heavily layered and in their nature exhibit VTI velocity anisotropy behavior (Van Dok et al. 2011). This statement indicates that the world among us is not isotropic and we should not neglect this fact in our geophysical research. Anisotropy, in general is the property of the material. It can be described as the attribute of a material’s property with respect to the direction in which it is measured (Pereira & Jones 2010). There are two essential types of anisotropy: VTI and HTI. Vertical velocity layering gives rise to VTI (vertical transverse isotropy) velocity in which seismic wave velocity is faster in the horizontal direction than in the vertical one. The second type of isotropy is horizontal transverse isotropy (HTI) which causes azimuthal traveltime variations. The common mechanism for this type of anisotropy is vertical aligned fractures in an isotropic background medium (Jenner 2011.) Authors of this study focused mostly on VTI as this type of anisotropy is present in shale formations, as a result of small scaled heterogeneities from fine layering (Thomsen 1986). The VTI anisotropy can be mathematically described by using three Thomsen parameters: epsilon, delta and gamma. Epsilon is a measure of the difference between the horizontal and vertical propagation velocities for compressional waves. Gamma parameter is a measure of the difference in the horizontal and vertical propagation velocities for horizontally polarized shear waves (SH waves). Delta parameter is not easily described either mathematically or qualitatively (Pereira & Jones 2010), but it influences the anisotropy velocities in medium incidence angles. These parameters can be mathematically expressed by equations proposed by Leon Thomsen (Thomsen 1986). In this study, authors present influence of VTI anisotropy on microseismic data recorded during hydraulic fracturing of shale intervals in one of the well located in Northern Poland. Authors points out how the anisotropy affects on microseismic events location, locating them in isotropic and anisotropic velocity models with usage of TGS algorithm. Furthermore, authors indicate possible solution to estimate VTI parameters based on microseismic data. VTI anisotropy parameters plays critical role not only in case of microseismic data analysis but also in processing of active seismic data. Authors proved that VTI anisotropy present in the investigated area has strong influence on microseismic events location especially in depth. Moreover estimation of VTI anisotropy parameters based on microseismic data with usage of Thomsen equations is possible.
Źródło:
Geology, Geophysics and Environment; 2016, 42, 1; 131-132
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metoda udarowego hydraulicznego szczelinowania górotworu za pomocą strzelań odpalanych w otworach wypełnionych wodą pod ciśnieniem w aspekcie zwalczania zagrożenia tąpaniami
The method of percussive hydraulic fracturing of rock mass with blasting fired in blastholes filled with water under pressure from the point of view of reducing rock-bump hazard
Autorzy:
Krawiec, A.
Powiązania:
https://bibliotekanauki.pl/articles/350154.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
hydrauliczne szczelinowanie skał
zapobieganie wstrząsom
aktywne metody ograniczania wstrząsów
hydraulic fracturing of rock mass
rock-bump prevention
reducing rock-bump hazard with active methods
Opis:
Wszystkie metody zwalczania tąpań stosowane w naszych kopalniach węgla kamiennego są ważne i aktualne i jako takie powinny być stale i konsekwentnie rozwijane oraz doskonalone w oparciu o najnowsze osiągnięcia nauki i techniki górniczej w tym zakresie. Dotyczy to w szczególności zwalczania tąpań metodami aktywnymi. Omówiono dość szczegółowo wybrane uwagi do metody aktywnego zwalczania tąpań za pomocą strzelań wstrząsowych i wtłaczania wody pod ciśnieniem w górotwór, wskazując na ich małą skuteczność i niezawodność. Stąd autor opracowania zaproponował radykalne rozwiązanie tego problemu poprzez agresywne zwiększanie oddziaływania środkami technicznymi na górotwór. Cel ten osiągnięto przez połączenie w jedną całość wykonawczą dwóch metod aktywnego zwalczania tąpań, dotychczas stosowanych oddzielnie, tj. strzelań wstrząsowych i wtłaczania wody pod ciśnieniem. Powstałą w ten sposób oryginalną metodę aktywnego zwalczania tąpań nazwano "metodą udarowego hydraulicznego szczelinowania górotworu za pomocą strzelań odpalanych w otworach wypełnionych wodą pod ciśnieniem". Opisano dość dokładnie, na czym polega i jaka jest istota i mechanizm tej metody. Omawiana metoda zastosowana w aspekcie odmetanowania pokł. 501/510 w KWK "Wesoła" dała rewelacyjny wynik, a mianowicie pozwoliła uzyskać 15-krotny wzrost wypływu metanu z otworu odmetanowującego przy zachowaniu stałych warunków w czasie prowadzenia eksperymentu.
All methods of reducing rock-bump hazard in our coalmines are important and up-to-date and as such should be permanently and consistently developed and improved using the latest achievements in science and mining technology in this field. This applies particulary to combating rock-bump with active methods. The author discussed in details selected comments on methods of active rock-bump hazard reduction with shock blasting and infusion of water under pressure into the rock mass indicating their low effectiveness and reliability. Hence, the author proposed radical solution of this problem consisting in aggressive increase of applying technical means to rock mass. This aim was achieved by combining into one procedure two methods of active rock-bump hazard reduction that were used separately so far, that is shock blasting and forcing water under pressure. The original method of active reduction of rock-bump hazard established in this way was called the method of percussive hydraulic fracturing of rock mass with blasting fired in blast holes filled with water under pressure. The essence and mechanism of this method were described in details. The method under discussion applied for methane drainage of the seam 501/510 in ,,Wesoła" Coal Mine produced sensational results, that is fifteen fold increase of methane emission from methane drainage borehole, keeping the same conditions during the time of conducting the experiment. Therefore the author of this paper proposes to apply this method also to reducing rock-bump hazards.
Źródło:
Górnictwo i Geoinżynieria; 2005, 29, 3; 9-16
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laboratory measurement of wettability for Ciężkowice sandstone
Autorzy:
Czarnota, R.
Janiga, D.
Stopa, J.
Wojnarowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/298866.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Ciężkowice sandstone
rock wettability
oil fields
Opis:
The type of reservoir rock wettability is one of the most important factors affecting flow of formation fluids in rock pores. It impacts on the characteristics of capillary pressure curves and residual oil saturation, what result in final recovery factor. There are generally, four differ states of wettability for hydrocarbon fields. These are: water wet, oil wet, mixed and fractional. For determination of wettability both quantitative and qualitative methods are implemented. In presented work, the results of wettability laboratory measurement for Ciężkowice sandstone by Amott–Harvey has been shown. Obtained outcomes underline the influence of wettability phenomena on the recovery factor for Carpathian hydrocarbon fields, where Ciężkowice sandstone is the oil bearing formation. The proper understanding of the wettability of reservoir is essential for determining the most efficient way of oil production.
Źródło:
AGH Drilling, Oil, Gas; 2016, 33, 1; 167-172
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How to localize an Underground Gas Storage (UGS) in a salt structure of the Fore-Sudetic Monocline in light of its geomechanical properties
Autorzy:
Zeljaś, D.
Powiązania:
https://bibliotekanauki.pl/articles/298757.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
underground storage
natural gas storage caverns
saline rock mass stability
geomechanical properties of salt rock
Opis:
The analysis of formal and legal regulations revealed that Underground Gas Storages are a favorable option in Polish conditions. The author presented a possible localization of an UGS in a salt structure of the Fore-Sudetic Monocline, indicating the advantages of the area and problems to be solved. Attention was paid to the UGS stability and complexity of this issue. The presented strength indices and rheological parameters of salt were based on laboratory experiments. In the future they can be used at the stage of designing and performing geomechanical analyses.
Źródło:
AGH Drilling, Oil, Gas; 2016, 33, 4; 699-711
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reinterpretation of the results of the two-cycle reservoir test of the Mesozoic water-bearing deposits in the W-3 well in terms of assessing the changes in rock permeability in the zones tested with a drill stem tester
Autorzy:
Dubiel, S.
Rzyczniak, M.
Solecki, M. L.
Powiązania:
https://bibliotekanauki.pl/articles/299295.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Carpathian Foredeep
DST result
rock permeability
Opis:
The article presents the results of the reinterpretation of the results of the two-cycle DST of the Mesozoic strata in the W-3 well to assess the changes in permeability of reservoir rocks in the test zone. Two-dimensional diagrams of the first and second pressure restoration curves in the semi-logarithm coordinate system were taken into account. The determined linear regression equations of these sections give simultaneously the extrapolated value of the reservoir pressure and the directional coefficient. The “logarithmic approximation” method used in hydrogeology was used to determine the radius of the perimeter zone with altered permeability of the water-bearing rocks of the Mesozoic.
Źródło:
AGH Drilling, Oil, Gas; 2018, 35, 1; 57-68
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eksploatacja skał trudno urabialnych towarzyszących złożu węgla brunatnego "Bełchatów" z możliwością ich przemysłowego wykorzystania
Exploitation of hard rock-mass accompanying of the lignite deposit "Bełchatów" and possibility their industrial utilization
Autorzy:
Kozioł, W.
Sośniak, E.
Jończyk, W.
Machniak, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/350694.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
utwory trudno urabialne
hard rock mass
Opis:
W BOT KWB "Bełchatów" SA ze względu na usytuowanie złoża w rowie tektonicznym oraz dużą głębokość zalegania pokładu węgla istnieje konieczność urabiania skał trudno urabialnych budujących brzegi rowu. W referacie przedstawiono ogólną charakterystykę geologiczną oraz ilościową skał trudno urabialnych podłoża mezozoicznego towarzyszącego złożu węgla brunatnego "Bełchatów". Na podstawie charakterystycznych cech jakościowych występujących utworów dokonano oceny ich urabialności. Przedstawiono stosowane technologie oraz operacje technologiczne, mające na celu maksymalne wykorzystanie tych utworów zarówno na potrzeby własne kopalni, jak i dla odbiorców zewnętrznych. Z analizy parametrów jakościowych skał trudno urabialnych wynika, że produkowane kruszywa mogą być zaliczone do kruszyw drogowych co najwyżej III klasy, a część z nich będzie kruszywem pozaklasowym. Obecnie duże zapotrzebowanie na kruszywa drogowe i budowlane w Polsce, w tym również niższych klas, powoduje, że są one cennym produktem rynkowym.
In BOT KWB "Bełchatów" SA exist the necessity to mine of hard rock-mass in relation to locations of the lignite deposit in rift valley as well as large depth of overburden covering this deposit. The paper describes general geological profile as well as quantity of the rock-mass. Gettability was marked on basis of characteristic qualitative features. The applied technologies as well as technological operations aim at maximum utilization of these rock-mass for own demands as well as the external recipient demands. The analysis of rock-mass qualitative parameters results that produced aggregates was classified to road aggregates the lowest class, and part with them will be off class aggregates. Large demand for road and construction aggregates in Poland, also for lower classes (quality), causes that those aggregates are valuable market product.
Źródło:
Górnictwo i Geoinżynieria; 2007, 31, 2; 399-412
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 149

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