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Acoustic Full Waveforms as a Bridge between Seismic Data and Laboratory Results in Petrophysical Interpretation

Wawrzyniak-Guz K.

Acta Geophysica

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2016

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Vol. 64, no. 6

2356--2381

EN

Mutual relationships between geological and geophysical data obtained by using methods of different scale are presented for the Miocene sandy-shaly thin-bedded formation and for the Zechstein carbonate formation. The common basis of laboratory results, well logging and seismic data was a recognition of elastic and reservoir properties of rocks. The common basis of laboratory results, well logging and seismic data were elastic and reservoir properties of rocks. Seismic attributes calculated from acoustic full waveforms were a link between the considered data. Seismic attributes strongly depend on small changes observed in rock formation related to lithology variations, facies changes, structural events and petrophysical properties variability. The observed trends and relationships of high correlation coefficients in the analysed data proved the assumption made at the beginning of research that common physical basis is a platform for data scaling. Proper scaling enables expanding the relationships determined from laboratory and well logging of petrophysical parameters to a seismic scale.

2

Scale problems in assessment of hydrogeological parameters of groundwater flow models

Nawalany M., Sinicyn G.

Geologos

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2015

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Vol. 21, No. 3

179--185

EN

An overview is presented of scale problems in groundwater flow, with emphasis on upscaling of hydraulic conductivity, being a brief summary of the conventional upscaling approach with some attention paid to recently emerged approaches. The focus is on essential aspects which may be an advantage in comparison to the occasionally extremely extensive summaries presented in the literature. In the present paper the concept of scale is introduced as an indispensable part of system analysis applied to hydrogeology. The concept is illustrated with a simple hydrogeological system for which definitions of four major ingredients of scale are presented: (i) spatial extent and geometry of hydrogeological system, (ii) spatial continuity and granularity of both natural and man-made objects within the system, (iii) duration of the system and (iv) continuity /granularity of natural and man-related variables of groundwater flow system. Scales used in hydrogeology are categorised into five classes: micro-scale – scale of pores, meso-scale – scale of laboratory sample, macro-scale – scale of typical blocks in numerical models of groundwater flow, local-scale – scale of an aquifer/aquitard and regional-scale – scale of series of aquifers and aquitards. Variables, parameters and groundwater flow equations for the three lowest scales, i.e., pore-scale, sample-scale and (numerical) block-scale, are discussed in detail, with the aim to justify physically deterministic procedures of upscaling from finer to coarser scales (stochastic issues of upscaling are not discussed here). Since the procedure of transition from sample-scale to block-scale is physically well based, it is a good candidate for upscaling block-scale models to local-scale models and likewise for upscaling local-scale models to regional-scale models. Also the latest results in downscaling from block-scale to sample scale are briefly referred to.

3

Zagadnienie skali w hydrogeologii

Nawalany M.

Biuletyn Państwowego Instytutu Geologicznego

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1999

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nr 388 Hydrogeologia

179-189

PL

Zagadnienie skali parametrów fizycznych opisujących przepływ i transport w ośrodku porowatym zostało omówione głównie w aspekcie jego ważności dla modelowania podstawowych procesów hydrogeologicznych - filtracji oraz transportu zanieczyszczeń w utworach hydrogeologicznych. Oprócz przedstawienia definicji podstawowych pojęć, w artykule omówiono współczesne metody teoretyczne i numeryczne, umożliwiające analizowanie problemu skali oraz wytyczanie przyszłych kierunków badań w tej dziedzinie.

EN

Problem of up-scaling of physical parameters that describe flow and mass transport in porous media is discussed mainly from point of view of mathematical modelling of basic hydrogeological processes - filtration and pollution transport in rocks. In addition to presentation of definitions of major notions the article describes the modern theoretical and numerical methods that allow for analysing the scale problem and specifying directions of future research in this area.