Wyniki wyszukiwania - Biblioteka Nauki

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Wstępne wyniki modelowań przestrzennych (3D) parametrów petrofizycznych skał podczas poszukiwań stref występowania gazu zamkniętego w polskim basenie czerwonego spągowca

100%

Papiernik B. , Górecki W. , Pasternacki A.

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tom Vol. 58, nr 4

352-364

EN

The Rotliegend Basin is filled with terrigenic complex over 1200 m in thickness. The complex comprises sediments of eolian, fluvial and playa depositional systems (Fig. 1). Reservoir volume of the pore space accessible for the reservoir media is ca. 830-990 km3. Gas exploration in this stratigraphic unit is now focused at depths of around 3000-3800 m b.s.l., in the near-top zone. Poor reservoir properties, especially permeabilities, are here the limiting factor for conventional exploration. A change in the prospecting strategy to comprise tight gas targets moves research into the deeper zone covering the whole profile of the Rotliegend. The paper presents preliminary results of 3D modeling of lithofacies and related petrophysical parameters variability. The static model was created with the use of Petrel 2009.2. Structural framework was built using regional structural, isopach and facies maps. It was relatively detailed, comprising 9 576 000 cells organized in 3 zones and 60 layers. To estimate facies model, the authors used results of integrated environmental analysis of core data and logs from 117 wells (Fig. 2 ). Models of clay content (Vsh) and porosity (PHI) were based on logs from 75 wells. The obtained results show that the northern margin of the Eastern Erg is characterized by presence of numerous eolian strata with porosity ranging from 5 to 15%. Their quality, quantity and thickness decrease toward the north, along with increase in depth. Modeling results indicate that the dominating porous layers of eolian sandstones and fluvial inserts are often intercalated with "non-reservoir" layers revealing porosity below 5%. In this zone, a deeper part of the Rotliegend section should be investigated more thoroughly (Fig. 5, 6, 9). The Pomeranian sector of the Central Basin is dominated by playa and fluvial sediments (Fig. 7, 8, 10). Slightly clayey eolian strata make a few, laterally discontinuous intercalations. Gas accumulations could be expected within local, laterally confined interlayers of eolian and fluvial sandstones with porosity of around 5-12%. Due to the location in the near-base part of the Rotliegend section, close to Carboniferous source rocks, they may be filled with gas, forming so-called sweet spots. Probability of gas occurrence in Pomerania is high as indicated by the Międzyzdroje gas field or small accumulation found in Piaski-PIG2 well. The presented preliminary study allowed to test usability of 3D modeling in tight gas prospecting. Fully reliable results will be obtained after increasing precision of the models comprising detailed seismic interpretation, the use of seismic attributes, and inclusion of quantitative data in diagenetic processes and sedimentology of layers in the modeling process.

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Wykorzystanie powierzchniowych badań geochemicznych do oceny szczelności naftowych otworów wiertniczych

100%

Sechman H. , Dzieniewicz M. , Górecki W.

WUG : bezpieczeństwo pracy i ochrona środowiska w górnictwie

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2006

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tom nr 6

36-38

PL

W artykule przedstawiono wykorzystanie powierzchniowych badań geochemicznych, realizowanych w wariancie gazu wolnego do oceny szczelności naftowych otworów wiertniczych. Zastosowana metodyka badań umożliwia selekcję genetyczna mierzonych stężeń składników gazowych w próbkach powietrza podglebowego. Możliwości te i "czułość" zastosowanej metody pozwalają określić szczelność badanych obiektów już na etapie mikrowycieków. Wyniki powierzchniowych badań geochemicznych przeprowadzonych przez zespół Zakładu Surowców Energetycznych AGH wskazywały na wyraźne nieszczelności niektórych z badanych otworów wiertniczych, jak również pozwalały na stwierdzenie obecności efektów współczesnych przemian biochemicznych występujących w ich sąsiedztwie. W skrajnych przypadkach wysokie stężenie metanu w utworach przypowierzchniowych stwarzały potencjalne zagrożenia dla otoczenia.

EN

The paper presents the application of surface geochemical survey methods ("free gas" variety) to tightness control of petroleum boreholes. The applied methods enable the genetic classification of measured concentrations of gaseous components in the soil atmosphere. Opportunities provided by this method, including sensitivity allow to determine the borehole tightness at the stage of micro-leaks. The results of surface geochemical survey effected by the Department of Fossil Fuels, AGH-University of Science and Technology in Kraków determined the tightness level of studied and biochemical effects observed in their vicinity. In extreme cases high methane concentrations in the near-surface zone created potential hazard for environment.

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Computer-aided quantitative subsurface mapping : examples of utilization

100%

Papiernik B. , Hajto M. , Górecki W.

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tom Vol. 53, nr 10/2

956-960

EN

The present age of digital subsurface mapping is represented above all by quantitative maps based on regular grids. They are created on the basis of various input data: digitized contours, widely comprehended well data, 2D and 3D seismic, and qualitative geological maps. Scope and the data utilization and the applied methodology of processing are strictly dependent on the scale and purpose of a given map; for regional and detailed maps they are significantly different. However, irrespective of the map scale, correct models, reflecting probable subsurface variability, instead of the input data spatial distribution and applied estimation algorithm themselves, are conditioned by chances of integrating of all the mentioned types of data. These purposes can be achieved only through the application of the most flexible interpretive programs such as ZMAP–Plus or mapping modules of the Geographix system. High quality quantitative subsurface maps based on regular grids are nowadays used first of all in petroleum exploration and geothermal research. But development of such studies may contribute to creation of high-quality, interactive, subsurface models, available not only for owners of expensive professional software but also for all geoscientists interested in these topics.

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Gas generation in Carboniferous source rocks of the Variscan foreland basin : implications for a charge history of Rotliegend deposits with natural gases

75%

Botor D. , Papiernik B. , Maćkowski T. , Reicher B. , Kosakowski P. , Machowski G. , Górecki W.

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2013

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tom Vol. 83, No. 4

353--383

EN

Numerical modelling of the Carboniferous–Permian petroleum system in the Polish Basin was carried out using PetroMod software. The Carboniferous source rocks contain organic matter mostly of a humic nature (gas-prone Type III kerogen). Subordinately, only in the Lower Carboniferous deposits, kerogen of algal marine origin and mixed Type II/III kerogen occur. The quantity of dispersed organic matter is variable, but usually below 2% TOC. In the Carboniferous section, a progressive increase in the maturity of organic matter with depth was observed, from approximately 0.5% Rr at the top of the Westphalian in marginal parts of the Carboniferous basin to over 5.0% Rr at the bottom of the Lower Carboniferous in the eastern Fore-Sudetic Homocline. The thermo- genic generation of hydrocarbons continued from the late Westphalian (eastern Fore-Sudetic Homocline and partly Pomerania) throughout the Mesozoic, up to the Late Cretaceous. The advancement of this process is va- riable in different parts of the Carboniferous basin, reaching up to 100% of kerogen transformation in the zones of maximum maturity of organic matter. However, the most intensive periods of gas generation and migration were the Late Triassic and the Late Jurassic. The most prospective areas are located NE of Poznań–Kalisz line and SW of Poznań.

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The prospects for petroleum exploration in the eastern sector of Southern Baltic as revealed by sea bottom geochemical survey correlated with seismic data

75%

Domżalski J. , Górecki W. , Mazurek A. , Myśko A. , Strzetelski W. , Szamałek K.

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tom Vol. 52, nr 8/2

792-799

EN

In the Polish offshore Łeba (B) tectonic block in the southeastern part of the Baltic Sea the oil and gas fields are accumulated in Middle Cambrian quartzose sandstone, often fractured and diagenetically sealed at depth by advanced silification developed in reservoir around the petroleum deposit. Petroleum traps aremainly of structure-tectonic type, i.e., anticlines closed with strike-slip faults. At least four gas-condensate and four oil deposits of total reserves more than 10 Gm3 gas and 30 Mt oil were discovered by the “Petrobaltic” Co. in the Polish Baltic sector. The subsurface petroleum deposits in the Cambrian reservoir are the source of secondary vertical hydrocarbon migration to the surface which produces surface microseepages and hydrocarbon anomalies. Geochemical survey of the sea bottom sediments and waters run along seismic profiles was completed in 1999–2002 within a joint project of “Petrobaltic” Co. Gdańsk and the Fossil Fuels Dept., AGH University of Science and Technology, Kraków, approved by theMinistry of Environmental Protection, Natural Resources and Forestry. It was found that seafloor hydrocarbon anomalies are closely related to subsurface geologic structure and location of petroleum deposits. Particularly the faults as principal venues for vertical hydrocarbon migration are reflected in high-magnitude seafloor anomalies. Above petroleum field there occurs a “halo” effect of high-magnitude anomalies contouring the deposit with damping related to productive zone situated inbetween. Thus, the section of sea bottom anomalies over a petroleum deposit resembles the shape of a volcanic caldera. Positive subsurface structures manifest themselves as neotectonic features in the sea-floor morphology and as petrological variations of the bottom sediments. Along the contours of petroleum field, the sea-floor seeps of gas and submarine springs of subsurface water occur. These are seismically recognizable as gas chimneys, geysers, craters and effusive cones. The sea-floor geysers and springs disturb thermal and density stratification of sea water column. The submarine geochemical studies strictly correlated with seismic profiles may contribute greatly to offshore petroleum exploration and marine environmental protection.

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Badania naukowe i kształcenie geologów naftowych w historii rozwoju specjalności naftowej na Wydziale Geologii, Geofizyki i Ochrony Środowiska w Akademii Górniczo-Hutniczej

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Burzewski W. , Dzieniewicz M. , Górecki W. , Kotarba M. , Kuśmierek J. , Maćkowski T. , Słupczyński K. , Strzetelski W.

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tom T. 27, z. 2--4

741-791

PL

Omówiono osiągnięcia Zakładu Surowców Energetycznych w badaniach naukowych i działalności dydaktycznej w ujęciu historycznym. Opisano wkład zespołów badawczych w rozwój polskiej myśli geologiczno-naftowej w obszarach Karpat fliszowych, zapadliska przedkarpackiego i Niżu Polskiego. Zaprezentowano metodyczne osiągnięcia Zakładu w zakresie geologii i geochemii naftowej, metodyki poszukiwań złóż ropy naftowej i gazu ziemnego, geochemii powierzchniowej i informatyki naftowej oraz dokonania w zakresie geotermii - nowej dziedziny nauki. Omówiono twórczy wkład pracowników i absolwentów specjalności naftowej w prace poszukiwawcze i odkrycia złóż węglowodorów w Polsce

EN

Achievements of the Department of Fossil Fuels in scientific research and educational activity are discussed, with historical formulation of the subject. Contribution of research teams to the development of Polish petroleum-geology ideas in the Flysch Carpathians, Carpathian Foredeep, and Polish Lowlands are described. Methodological attainments of the department in petroleum geology, petroleum geochemistry, methodology of petroleum exploration, surface geochemistry, and petroleum information science are presented, together with achievements in a new field of knowledge - geothermal energy. Significant contribution of the department's employees and graduates to the petroleum exploration and discoveries in Poland are also discussed