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9th EAGE/EEGS Meeting
- Conference date: 31 Aug 2003 - 04 Sep 2003
- Location: Prague, Czech Republic
- ISBN: 978-94-6282-116-3
- Published: 01 September 2003
151 - 180 of 180 results
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Comparison of fundamental modes of illumination for cross-hole electrical impedance tomography: Part II - Synthetic modelling
Authors O. Kuras, J. E. Chambers, P. I. Meldrum and R. D. OgilvyCross-borehole electrical surveying, in which current and potential electrodes are placed downhole in two horizontally separated boreholes and moved over a range of depths, yields information about the variation of electrical properties in the subsurface between the boreholes.
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Small-scale electrical borehole imaging of fractures in Permo-Triassic sandstone
More LessThe increasing interest in the nature of fill material in fractures, driven by research into the disposal of radioactive wastes in crystalline rocks and the migration of non-aqueous phase liquids, has resulted in a renewed emphasis on the study of fractures. One current investigation is an project funded in the UK by the Engineering and Physical Science Research Council (EPSRC) entitled 'Sediment-filled fractures in Triassic Sandstones - pathways or barriers to contaminant migration?'. Part of this study involved the drilling of three test boreholes on the campus of the University of Birmingham and a detailed investigation of the fractures encountered in the boreholes with packer testing, core logging, core sampling and wire-line logging. An associated project was the design and testing of a high-resolution imaging tool for the investigation of the various fractures encountered in the boreholes. This poster presents the preliminary results of the imaging.
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Detailed study of the natural groundwater flow at the natural attenuation forecast test site by well logging
More LessThere is a natural attenutation testing site near Hnevice village, which is beeing carefully studied. The test site is situated in the quatemary terrace of the Labe river, which continues to Germany as Elbe and reaches the North sea at the city of Hamburg.
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The benefits of well logging for the reduction of environmental impacts on contaminated land
By M. ProcházkaModem well logging is a relathely cheap method offering a wide range of information. Well logging oriented to risk assessment and supervision projects can prevent various problems. It is usually much more expensive or, in many cases, impossible to solve such problems later on. A frequent problem is the percolation of contaminated water to lower aquifers caused by bad construction of boreholes. Careless dislocation of boreholes in contaminated, areas is another common problem.
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Calculation of basic constants of microlog - theory and interpretation
By F. RysavýThe classical way of determination of basic constants using a water tank flooded with NaCI-water solution when the resistivity of that solution is known, is influenced negatively with two factors. Both make that the constants determined in so way are lower than their real values.
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Topographic correction for dike geometry using averaged half-Wenner configuration
More LessMulti-electrode arrays are widely used in dike monitoring. Cables connect a large number of equally spaced electrodes with a control unit that selects the active electrodes according to a predefined measurement sequence.
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Sensitivity study of 3-D modelling for 2-D inversion of surface NMR
Authors W. Warsa, O. Mohnke, M. Hertrich and U. YaramanciThe method of Surface Nuclear Magnetic Resonance (SNMR) allows a direct determination of hydrogeological parameters of the subsurface. For improving capability and reliability of SNMR method we present a forward modelling scheme of three-dimensional water content and decay time structures that can be used for two and three-dimensional interpretation.
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GPR for small scale investigations in soil
Authors J. Schmalholz, M. Müller and U. YaramanciThe ground penetrating radar (GPR) is a geophysical tool, which has growing applications in soil physics for the determination of soil water content in the unsaturated zone. One of the main objectives of the Research-Group INTERURBAN established by the Deutsche Forschungsgemeinschaft (German Science Council, DFG) is the detection of shallow small scale (centimetre to decimetre range) dry and wet regions respectively in top soil.
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History and future developments for small scale applications of nuclear magnetic resonance
Authors M. Müller and U. YaramanciThe nuclear magnetic resonance (NMR) technique is mainly known in geophysics for well logging and laboratory applications. In recent years, Surface NMR (SNMR, or magnetic resonance sounding, MRS) has become available for hydrogeological applications (e.g. Shirov et al., 1991; Yaramanci et al., 1999).
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Hydrological properties derived from nuclear magnetic resonance properties of unconsolidated rocks and synthetic samples
Authors S. Kooman, M. Müller and U. YaramanciSince MRS (Magnetic Resonance Sounding)/SNMR (Surface Nuclear Magnetic Sounding) has proved to be a useful tool for the investigation of hydrological properties of the subsurface (Legchenko et al, 2002), the interest for laboratory NMR hasstrongly increased. In our work we therefore analysed the NMR properties of synthetic and natural unconsolidated samples to increase the understanding and interpretation of SNMR data. To verify the NMR measurements several other (petro)physical measurements have been performed.
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Surface NMR as part of an integrated geophysical survey in Thailand
More LessWithin the Thai-Gem research project 'Recommenriations for Site Investigations of Waste Disposal Sites and Contaminated Sites in Thailand' (WADIS) an integrated geophysical survey has been carried out in the Dan Khun Thot region near the provincial capital of Nakhon Ratchasima (Khorat). This area, located on Khorat Plateau in north-east Thailand, is characterised by increased land salinisation as a probable consequence of deforestation. Saline soil is the origin of various environmental problems, such as shortage of freshwater during the dry season, soil degradation md decrease of crop.
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EMS electromagnetic multi-frequency sounding device
Authors A. Manstein and Y. MansteinElectromagnetic multifrequency sounding device EMS is developed in Laboratory of EM fields of Institute of Geophysics, Russian Academy of Sciences, Siberian Branch. The manager of the Laboratory - Dr. Michael Epov; manager of the device development group - Dr. Alexander Manstein.
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New way of ground penetration - method of a proton magnetic resonance
Authors S. Izumov and S. DruchininJoint Stock Company "Geological Prospecting" for a number of years is working on a problem of researching of geological structure of ground using different geophysical methods: georadar technology, seismic reflection method, vertical electrical penetration.
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Influence of water content in sand on GPR data
By O. LoefflerWith Ground Penetrating Radar (GPR), the objects buried near the subsurface may be determined with great accuracy. In urban areas, its use is sometimes inefficient because of the complicated and mixed signals it records. In geological purposes, it is limited by the penetration depth depending on geology and water saturation of the subsoil.
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Quality controlled evaluation of engineering geophysical penetration soundings
Authors D. Drahos, P. Draskovits, P. Salát and J. StickelThe Engineering Geophysical Penetration Sounding (EGPS) method is widely used in Hungary for exploration loose sediments. Determination of the quality (reliability and/or accuracy) of their data acquisition and their inversion is not only an important part of the geophysical methodology, but recently it is strict requirement for the qualification of the geophysical activity too.
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Cone penetration logging in LNAPLs contamination studies
More LessLight non-aqueous phase liquids (LNAPLs), such as crude oil and by-product fuels, represent a common source of organic contamination in the environment. Successful remediation of contaminated sites requires knowledge of the LNAPLs distribution in the subsurface.
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The measure of the pressure drop for different gas velocities in a fluidized bed
Authors M. A. R. Talaia and A. H. AmorimThis study describes the behaviour of particles with equivalent diameter 205 µm (fine sand, according to the classification of sedimentary particles based on the Wentworth scale), fluidized by air in a 100 mm vertical Perspex column, with the bed open to the atmosphere. The pressure drop in bed for different gas velocities has been measured using the fast response pressure transducers connected to the column. The signals from two transducers were continuously recorded on a computer and the records of drop pressure versus time were obtained.
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Geophysical investigations on the connection between salt structures and aquifers in Schleswig-Holstein
Authors H. Wiederhold, G. Agster, F. Binot and R. KirschIn Schleswig-Holstein, the northernmost state of Germany, Tertiary sandy layers are the most important fresh water reservoirs for the water supply. Normally they are covered by clay layers and thus are well protected against contamination from the surface.
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Comparison between ground and airborne EM data in mapping acid sulphate soils and sulphide bearing clays in the river Kyronjoki valley, Western Finland
Authors I. Suppala, H. Vanhala and P. LintinenThe acid sulphate soils, along the coastal plains in westem Finland, originate from the sulphide rich clays and silts that deposited during earlier, more extensive phase of the Baltic Sea. Conditions favorable for sulphide formation existed in shallow coastal bays where decomposing of organic matter resulted occasionally reducing conditions.
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New contribution of geophysics to geology and hydrogeology of lake Neusiedl (Neusiedlersee/Fertö, Austria/Hungary)
Authors L. Szarka, J. Lueger, F. Kohlbeck and Cs. UbránkovicsIn the nineties we carried out geophysical measurements in three areas in the Lake Neusiedl (in Hungarian: Ferto, in German: Neusiedlersee) region: two ones on the open lake and one in the vicinity of Mörbisch. In this paper a new interpretation of geophysical measurements is given.
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Geoelectric structure of the subsurface at sinkhole sites along the western shores of the Dead Sea
By M. EzerskyIn the present study we have used geoelectric methods to achieve a better understanding of the subsurface geoelectric structures at sinkhole development sites, taking into account that electrical parameters (such as resistivity or conductivity) are very sensitive to medium properties and their variations in time.
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Mapping of an ancient 'dead-ice' sink using electromagnetic reflection method (EMR, GPR).
By F. BahloulElectromagnetic reflection method (EMR, ground penetrating radar, GPR) has been used to delineate the groundwater table as well as to map shallow subsurface structures in selected areas in northern Germany. At a wooded area, one site revealed complex subsurface structures, which had no surface expression. A distinct sandy-filled, trough-shaped structure totally encased in silts was mapped. This structure is interpreted as 'dead-ice' sink, which shaped at the end of the late-glacial period due to melting of dead ice block and later filled with sediments.
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The place of the geophysics in environmental works
Authors G. Szathmáry and I. KaszásDuring the environmental works many times we use auxiliary methods beside the accepted classical methods. lt means combined application of the different geophysical methods, the conventional environmental research manner and remote sensing. The classical environmental exploration usually uses these methods in separate adaptation, although combining of these three ways of research complete each other and help US to do our work cost effective, more accurate and better.
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Shallow geoelectric structure of eastern part of Terceira Island (Acores) from AMT soundings
Authors F. Monteiro Santos, A. Soares, L. Matos, N. Lourenço, R. Luzio, E. Almeida, J. L. Gaspar and J. M. MirandaThe Terceira Island is located at the plate boundary between the Eurasian and African plates. This plate boundary usually referred to as the Terceira axis, is a highly complex, non conventional ridge system morphologically defined by a succession of deep rhombic basins and shallow volcanic banks or islands materializing domains of higher magmatic budget (Lourenço et al., 1998).
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Hydrogeological potentials of the Srem region for ground water exploitation from Triassic sediments
Authors Z. Rakic and M. FrancuskiSrem is situated in the territory of the Autonomous Region of Vojvodina, and actually spreads over south - western part of Pannonian depression which consists of rolling alluvial plain alongside the Sava river, mountain region on the right bank of the Danube, and the Fruska gora mountain.
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The new conception of the genesis of metanoids is a principle of the technology for revealing hydrocarbons (HC)
More LessThe detailed study of gas and oil deposits spreading in space and time revealed the fact that certain laws in their spreading don't exist. There is certain regularity in the processes happening on Earth. This follows from the detailed study of the genesis of metanoids (see table 1.)
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Forecast of current oil saturation based on nuclear physical log data of surrounded wells
Authors T. V. Khismetov and A. M. AhverdiyevOne of the most important problem of geoscientists and engineers faced on is connected with revealing of additional sources of hydrocarbons in the matured oil fields, which can be recovered with less expenses. Carbon/Oxygen logging (COR) in the cased wells is considered to be among the most effective methods of additional reserves discovery in such oil fields. However application of impulse neutron logging is not always applicable due to the technical reasons and demand of additional expenditures. New method where gridding-interpolation algorithm is used to forecast current oil saturation is proposed in the paper. The method was successfully used in Western Siberia oil fields.
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AVO analysis in offshore Persian Gulf
Authors A. M. Riahi and H. RazmyA seismic line from an oil field in offshore Persian Gulf was prospected to indicate if AVO analysis could detect hydrocarbon reservoirs?
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Geophysical surveys at a reclaimed mining site in Scotland
More LessAn integrated geophysical survey programme using magnetic and electromagnetic techniques was undertaken at Lochore Meadows Country Park, Fife, UK, the site of a reclamated colliery where recent ground subsidence has been a problem. The objectives of the geophysical survey were to test if geophysical techniques could be used to determine areas where ground instability existed as a result of the previous mining activities and subsequent reclamation. The Magnetic and Electromagnetic survey results showed geophysical signatures that were correlated with site plans showing manmade structures and potential cavities in the subsurface associated with the colliery workings.
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Shallow seismic surveys across the Ulsan fault near a province boundary in Korea
More LessRecent earthquakes near nuclear power plants in Korea have triggered public concems about possible seismicity of the Ulsan fault in the southeastern part of the Korean peninsula. To reveal and characterize subsurface structures of this fault, we conducted high-resolution seismic reflection and refraction surveys along two profiles of 835 m and 415 m long, respectively, across a fault valley. A 5 kg sledgehammer and twenty four 100-Hz geophones were used for seismic energy and receiver, respectively. Velocity tomograms from first arrivals of refraction data and 12-fold stacked sections obtained through conventional reflection processing show both seismic velocity structures and subsurface images of the fault zone. We interpret that the fault valley was initially formed by strike-slip motions, and then the near-vertical faults in basements were reactivated later by compressional stresses yielding reversed faults in the overburden.
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