TY - GEN AU - Puskás, Sándor AU - Törő, Mária AU - Vágó, Árpád AU - Ördög, Tibor AU - Tóth, Marianna AU - Kálmán, Gyula AU - Mátrai, Andrea AU - Nagy, Roland AU - Bartha, László AU - Hartyányi, Máté AU - Lakatos, István AU - Szentes, Gabriella AU - Dékány, Imre AU - Janovák, László AU - Geiger, János TI - Surfactant-Polymer Enhanced Oil Recovery Project at Algyő Field = Tenzides-Polimeres EOR Projekt Algyő mezőben PY - 2023 UR - https://m2.mtmt.hu/api/publication/34484377 ID - 34484377 LA - English DB - MTMT ER - TY - JOUR AU - Abutaha, Saja AU - Geiger, János AU - Fedor, F AU - Gulyás, Sándor TI - Continuous wavelet transformation to quantify small-scale cycles of petrophysical properties; a new approach applied in a potential disposal repository of nuclear waste, SW Hungary JF - GEOLOGIA CROATICA J2 - GEOL CROAT VL - 76 PY - 2023 IS - 3 SP - 131 EP - 146 PG - 16 SN - 1330-030X DO - 10.4154/gc.2023.11 UR - https://m2.mtmt.hu/api/publication/34401167 ID - 34401167 AB - Continuous Wavelet Transformation (CWT) was applied to study the small-scale repetitive oscillations of porosity distribution patterns in a 5 m silty-claystone core sample of the Boda Claystone Formation. We handled the fluctuations in voxel porosity averages over unequal depth distributions as signals over uneven time intervals. The strength of wavelet analysis lies in the ability to study the fluctuation of a signal in detail, i.e., the wavelet transforms permit automatic localization of the cyclic attributes' sequences both in time (the depth domain) and according to their frequency (the frequency domain). Thereupon, three main frequency branches (cycles) were discerned: small scale (5, 6.67, and 11 cm), intermediate scale (20, 30 cm), and large scale (66.67 cm). Depending on the CWT coefficients magnitude plot, we were able to detect the developments of porosity oscillation according to the depth variable. Thus, small-scale cycles were seen throughout the core sample., the intermediate-scale cycles were strong in the upper parts of the core sample and dwindled toward greater depths, and the large cycle was predominant in the lower part of the core sample. The cross-correlation of the wavelet coefficients of porosity and rock-forming components allows a detailed study of the inter-dependence of such parameters as their relationship changes over time. The distinct peaks at zero lag indicates that the measured wavelet coefficient series were contemporaneously correlated; their strong positive correlations suggest that both examined series respond similarly and simultaneously to other exogenous factors. The results emphasize that cyclical porosity fluctuations at all scales would concern three main factors; sediment deposition, diagenetic processes, and structural deformation (i.e., convolute laminations). LA - English DB - MTMT ER - TY - JOUR AU - Alzoubi, Nour AU - Gulyás, Sándor AU - Geiger, János TI - The use of CT analysis in revealing structural heterogeneity of freshwater carbonate decoration and construction stones [A CT-analízis alkalmazása az építő- és díszítőkőként használt édesvízi karbonátos kőzetek szerkezeti elemzésében] JF - ARCHEOMETRIAI MŰHELY J2 - ARCHEOMETRIAI MŰHELY VL - 20 PY - 2023 IS - 2 SP - 127 EP - 146 PG - 20 SN - 1786-271X DO - 10.55023/issn.1786-271X.2023-010 UR - https://m2.mtmt.hu/api/publication/34194777 ID - 34194777 AB - This article presents the findings of a CT analysis conducted on freshwater carbonate rocks found in the Danube-Tisza Interfluve. These rocks are utilized for both construction and decoration purposes in the medieval buildings of the region. The aim of the study was to uncover some petrophysical properties of the rocks deriving from the Csólyospálos quarry. The proportions of the main constituents of the rocks carry significant information about the formation and alteration history of sedimentary rocks. To comprehend and assess the nature of these processes, as well as the resulting spatial variations, it is necessary to gather quantitative data on the distribution of these constituents at both macro- and microscales. The researchers employed an EMmixture analysis that considered the density differences among the individual constituents to determine the quantitative characteristics of the main components that form the rocks. By setting a threshold value to distinguish macropores (empty spaces) with lower density values from the solid matrix, the percentage of voids was calculated for each CT slice. The distribution of these voids was examined in three dimensions along all possible axial directions (X, Y, Z). Watershed algorithm, and Laplace operator were applying on selected CT slices that corresponded to areas with similar compositional features. This approach helped identify potential flow directions within the rocks. The spatial distribution and orientation of macropores, which could be visualized using CT at a resolution of over 200 microns, provided valuable insights into the paths through which water could enter the carbonate rocks used for construction or decoration. This information is crucial in understanding structural damage caused by frost weathering and dissolution via capillary action once a staticstate flow is established. Furthermore, these findings complement the results obtained from laboratory geotechnical measurements. LA - English DB - MTMT ER - TY - JOUR AU - Eltijani, Abdelrhim AU - Molnár, Dávid AU - Geiger, János TI - Paleoenvironmental multiproxy dataset of the Quaternary abandoned channel in Tövises bed, Great Hungarian Plain JF - DATA IN BRIEF J2 - DATA BRIEF VL - 49 PY - 2023 PG - 6 SN - 2352-3409 DO - 10.1016/j.dib.2023.109344 UR - https://m2.mtmt.hu/api/publication/34090149 ID - 34090149 LA - English DB - MTMT ER - TY - JOUR AU - Eltijani, Abdelrhim AU - Molnár, Dávid AU - Geiger, János TI - Characterizing sedimentary processes in abandoned channel using compositional data analysis and wavelet transform JF - GEM - INTERNATIONAL JOURNAL ON GEOMATHEMATICS J2 - GEM - INT J GEOMATHEMATICS VL - 14 PY - 2023 IS - 1 PG - 16 SN - 1869-2672 DO - 10.1007/s13137-023-00223-y UR - https://m2.mtmt.hu/api/publication/33992807 ID - 33992807 N1 - Cited By :1 Export Date: 16 November 2023 Correspondence Address: Eltijani, A.; Department of Geology and Paleontology, Hungary; email: abdelrhimee@gmail.com AB - Grain size distribution (GSD) is essential for characterizing the deposition process. However, it is necessary to consider its compositional constraint to comprehend the statistical distribution of size fractions within the sediments. Compositional data analysis (CoDA) and wavelet transform (WT) represent alternative methods beyond traditional approaches, e.g., probability density function (PDF). This paper introduces a quantitative approach for characterizing Quaternary depositional and environmental changes using abandoned channel infill sediments. The proposed approach integrates CoDA and WT to thoroughly comprehend the depositional patterns observed in abandoned channels and the underlying environmental variability. The depositional model constructed based on CoDA showed coarsening-upward sequences, suggesting a periodic connection between the main channel and the oxbow lake. Three scales of cycles consistent with the depositional model constructed using CoDA were identified based on WT: small, medium, and large-scale cycles of processes. The large-scale cycles indicate the main depositional events, while the medium and small scale reflects the variation within and during deposition. CoDA and WT demonstrate excellent potential in characterizing the GSD and interpreting oxbow lakes' deposition and sedimentation processes. LA - English DB - MTMT ER - TY - JOUR AU - Alzoubi, Nour AU - Gulyás, Sándor AU - Geiger, János TI - Palaeoenvironmental and palaeoclimatic inferences based on X-ray computer tomography: a case study of alkaline lake deposits in Hungary JF - GEOLOGOS J2 - GEOLOGOS VL - 29 PY - 2023 IS - 1 SP - 33 EP - 49 PG - 17 SN - 1426-8981 DO - 10.14746/logos.2023.29.1.03 UR - https://m2.mtmt.hu/api/publication/33801312 ID - 33801312 N1 - Export Date: 9 June 2023 Correspondence Address: Alzoubi, N.N.; University of Szeged, 2-6 Egyetem u., Hungary; email: nouralzoubi@geo.u-szeged.hu LA - English DB - MTMT ER - TY - CHAP AU - Abutaha, Saja AU - Geiger, János AU - Gulyás, Sándor ED - Hatvani, István Gábor ED - Erdélyi, Dániel ED - Fedor, Ferenc TI - Assessing the representative elementary volume of rock types by X-ray computed tomography (CT) – a simple approach to demonstrate the heterogeneity of the Boda Claystone Formation in Hungary T2 - GeoMATES '22 International Congress on Geomathematics in Earth- and Environmental Sciences PB - MTA Pécsi Akadémiai Bizottság (MTA PAB) CY - Pécs SN - 9789637068140 PY - 2022 SP - 30 UR - https://m2.mtmt.hu/api/publication/33574672 ID - 33574672 LA - English DB - MTMT ER - TY - JOUR AU - Eltijani, Abdelrhim AU - Molnár, Dávid AU - Makó, László AU - Geiger, János AU - Sümegi, Pál TI - Applying grain-size and compositional data analysis for interpretation of the Quaternary oxbow lake sedimentation processes: Eastern Great Hungarian Plain JF - STUDIA QUATERNARIA J2 - STUD QUATER VL - 39 PY - 2022 IS - 2 SP - 83 EP - 93 PG - 11 SN - 1641-5558 DO - 10.24425/sq.2022.140885 UR - https://m2.mtmt.hu/api/publication/33547865 ID - 33547865 AB - Grain size distribution is one of the paleoenvironmental proxies that provide insight statistical distribution of size fractions within the sediments. Multivariate statistics have been used to investigate the depositional process from the grain size dis-tribution. Still, the direct application of the standard multivariate methods is not straightforward and can yield misleading interpretations due to the compositional nature of the raw grain size data. This paper is a methodological framework for grain size data characterization through the centered log ratio transformation and euclidean data, coupled with principal component analysis, cluster analysis, and linear discriminant analysis to examine Quaternary sediments from Tovises bed in the southeast Great Hungarian Plain. These approaches provide statistically significant and sedimentologically interpretable results for both datasets. However, the details by which they supplemented the conceptual model were sig-nificantly different, and this discrepancy resulted in a different temporal model of the depositional history. LA - English DB - MTMT ER - TY - JOUR AU - Alzoubi, Nour AU - Geiger, János AU - Gulyás, Sándor TI - Defining rock-forming components of Holocene freshwater carbonates via univariate statistical and mixture analysis of computer tomography data JF - STUDIA QUATERNARIA J2 - STUD QUATER VL - 39 PY - 2022 IS - 2 SP - 113 EP - 128 PG - 16 SN - 1641-5558 DO - 10.24425/sq.2022.140887 UR - https://m2.mtmt.hu/api/publication/33271059 ID - 33271059 N1 - Export Date: 27 November 2022 Correspondence Address: Alzoubi, N.N.H.; University of Szeged, 2-6 Egyetem u., Hungary; email: nouralzoubi@geo.u-szeged.hu Funding details: National Science Foundation, NSF, K129265 Funding details: European Commission, EC Funding details: Emberi Eroforrások Minisztériuma, EMMI, 20391-3/2018/FEKUSTRAT Funding details: European Regional Development Fund, ERDF, GINOP-2.3.2-15-2016-00009 Funding text 1: The authors are grateful to reviewers for their critical comments helping to improve the original manuscript. This work has been partially supported by NSF Grant K129265, and grants by the European Union, and the State of Hungary, co-financed by the European Regional Development Fund in the projects of GINOP-2.3.2-15-2016-00009 ‘ICER’” as well as the Ministry of Human Capacities, Hungary Grant 20391-3/2018/FEKUSTRAT. AB - Carbonate rocks are among the sedimentary systems which preserve information on the formation and diagenetic history expressed in its composition (distribution of its major rock-forming components (RFC). For estimating RFC proportions at the micro-scale, a simple counting of visible RFCs in thin sections using overlaid grids is a long-used, well-estab-lished technique. However, computer tomography (CT) analysis provides us with quantitative data in 3D at both the scale of the entire sample and a resolution defined by dimensions of the voxels at the micro-scale. The quantitative data expressed in Hounsfield units (HU) correlates with the density of RFCs. In this work statistical properties of CT-based data for selected freshwater carbonate samples from the Danube-Tisza Interfluve have been assessed using histograms and boxplots. Univariate statistical parameters characterize each sample. The maximum-likelihood method of mixture analysis has been adapted to recover and estimate the parameters of these subpopulations. Subpopulations have been defined in the form of overlapping intervals using statistical parameters gained (mean±2STD). Five major components have been defined: empty and partially or entirely filled pores by calcite, limestone micrite, dolomite micrite matrix and limonite saturated matrix. © 2022. The Author(s). LA - English DB - MTMT ER - TY - JOUR AU - Eltijani, Abdelrhim AU - Molnár, Dávid AU - Makó, László AU - Geiger, János AU - Sümegi, Pál TI - Application of Parameterized Grain-Size Endmember Modeling in the Study of Quaternary Oxbow Lake Sedimentation: A Case Study of Tövises Bed Sediments in the Eastern Great Hungarian Plain JF - QUATERNARY J2 - Quaternary VL - 5 PY - 2022 IS - 4 PG - 14 SN - 2571-550X DO - 10.3390/quat5040044 UR - https://m2.mtmt.hu/api/publication/33194069 ID - 33194069 N1 - Cited By :4 Export Date: 16 November 2023 Correspondence Address: Molnár, D.; Department of Geology and Paleontology, Hungary; email: molnard@geo.u-szeged.hu AB - Abandoned channels are essential in the Quaternary floodplains, and their infill contains different paleoenvironment recorders. Grain-size distribution (GSD) is one proxy that helps characterize the alluviation and associated sedimentological processes of the abandoned channels. The classic statistical methods of the grain-size analysis provide insufficient information on the whole distribution; this necessitates a more comprehensive approach. Grain-size endmember modeling (EMM) is one approach beyond the traditional procedures that helps unmix the GSDs. This study describes the changes in the depositional process by unmixing the GSDs of a Holocene abandoned channel through parameterized EMM integrated with lithofacies, age–depth model, loss-on-ignition (LOI), and magnetic susceptibility (MS). This approach effectively enabled the quantification and characterization of up to four endmembers (EM1-4); the characteristics of grain-size endmembers imply changes in sedimentary environments since 8000 BP. EM1 is mainly clay and very fine silt, representing the fine component of the distribution corresponding to the background of quiet water sedimentation of the lacustrine phase. EM2 and EM3 are the intermediate components representing the distal overbank deposits of the flood. EM4 is dominated by coarse silt and very fine sand, representing deposition of overbank flow during the flood periods. This paper demonstrates that the parametrized grain-size EMM is reasonable in characterizing abandoned channel infill sedimentary depositional and sedimentation history. LA - English DB - MTMT ER -