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Using Electrical Properties of Some Subsurface Sedimentary Rocks as a Tool to Detect Bedding Direction | ||
| فیزیک زمین و فضا | ||
| مقاله 2، دوره 46، شماره 4، بهمن 1399، صفحه 13-26 اصل مقاله (708.4 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/jesphys.2020.280457.1007112 | ||
| نویسنده | ||
| .Mohamed M Gomaa* | ||
| Professor, Department of Geophysical Sciences, National Research Center, Cairo, Egypt | ||
| چکیده | ||
| The direction of bedding is not natural to be detected using laboratory measurements. Cretaceous rocks are mainly composed of sandstone and clay (clastic facies, sandstones, siltstones, mudstone). Electrical characteristics were measured perpendicular and parallel to layer direction (42 Hz to 5 MHz) to detect anisotropy and homogeneity of samples. Electrical characteristics of samples were measured at the dry state and three different salines (NaCl) concentrations at a constant temperature. Electrical anisotropy and homogeneity of samples are contributed mainly to load pressure direction compaction. Previous factors are an excellent diagenetic feature and changes from one example to another. Elongation of conductor and insulator grains will change electrical properties. Due to the homogeneity of samples, the only variable in electrical characteristics will relate to the anisotropy of grains. When the grains are, more or less, spherical, then electrical components will be similar at two perpendicular directions. Whereas, when grains are needles or disks, later, electrical characteristics will be changed. This paper tries to detect qualitatively and as a quick tool, anisotropy and homogeneity of samples by measuring their electrical properties. Anisotropy in studied samples was described by slight to moderate electric lineation and foliation. | ||
| کلیدواژه‌ها | ||
| Electric؛ Dielectric constant؛ Complex conductivity؛ Clastic؛ Anisotropy؛ Heterogeneity | ||
| عنوان مقاله [English] | ||
| Using Electrical Properties of Some Subsurface Sedimentary Rocks as a Tool to Detect Bedding Direction | ||
| نویسندگان [English] | ||
| Mohamed M. Gomaa | ||
| Professor, Department of Geophysical Sciences, National Research Center, Cairo, Egypt | ||
| چکیده [English] | ||
| The direction of bedding is not natural to be detected using laboratory measurements. Cretaceous rocks are mainly composed of sandstone and clay (clastic facies, sandstones, siltstones, mudstone). Electrical characteristics were measured perpendicular and parallel to layer direction (42 Hz to 5 MHz) to detect anisotropy and homogeneity of samples. Electrical characteristics of samples were measured at the dry state and three different salines (NaCl) concentrations at a constant temperature. Electrical anisotropy and homogeneity of samples are contributed mainly to load pressure direction compaction. Previous factors are an excellent diagenetic feature and changes from one example to another. Elongation of conductor and insulator grains will change electrical properties. Due to the homogeneity of samples, the only variable in electrical characteristics will relate to the anisotropy of grains. When the grains are, more or less, spherical, then electrical components will be similar at two perpendicular directions. Whereas, when grains are needles or disks, later, electrical characteristics will be changed. This paper tries to detect qualitatively and as a quick tool, anisotropy and homogeneity of samples by measuring their electrical properties. Anisotropy in studied samples was described by slight to moderate electric lineation and foliation. | ||
| کلیدواژه‌ها [English] | ||
| Electric, Dielectric constant, Complex conductivity, Clastic, Anisotropy, Heterogeneity | ||
| مراجع | ||
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Gomaa, M.M., 2013, Forward and inverse modeling of the electrical properties of magnetite intruded by magma, Egypt. Geophysical Journal International, 194(3), 1527-1540.
Gomaa, M.M., Abou El-Anwar, E., 2015, Electrical and geochemical properties of tufa deposits as related to mineral composition in South Western Desert, Egypt. Journal of Geophysics and Engineering, 12(3), 292-302.
Gomaa, M.M. and Abou El-Anwar, E., 2017, Electrical, mineralogical, and geochemical properties of Um Gheig and Um Bogma Formations, Egypt. Carbonates and Evaporites, 1-14, https://doi.org/10.1007/s13146-017-0370-5.
Gomaa, M.M. and Elsayed, M., 2009, Thermal Effect of Magma Intrusion on Electrical Properties of Magnetic Rocks from Hamamat Sediments, NE Desert, Egypt. Geophysical Prospecting, 57(1), 141-149.
Gomaa M. M., Elnasharty, M. and Rizo, E., 2019, Electrical properties speculation of contamination by water and gasoline on sand and clay composite, Arabian Journal of Geosciences, Vol. 12, in print. https://doi.org/10.1007/s12517-019-4767-4.
Gomaa, M.M. and Kassab, M., 2016, Pseudo random renormalization group forward and inverse modeling of the electrical properties of some carbonate rocks. Journal of Applied Geophysics, Vol. 135, 144- 154.
Gomaa, M.M., Kassab, M. and El-Sayed, N.A., 2015, Study of electrical properties and petrography for carbonate rocks in the Jurassic Formations: Sinai Peninsula, Egypt. Arabian Journal of Geosciences, 8(7), 4627-4639.
Gomaa, M.M., Metwally, H. and Melegy, A., 2018, Effect of concentration of salts on electrical properties of sediments, Lake Quaroun, Fayium, Egypt. Carbonates and Evaporites, 1-9, https://doi.org/ 10.1007/ s13146-018-0433-2.
Gomaa, M.M. and Alikaj, P., 2009, Effect of electrode contact impedance on a. c. electrical properties of wet hematite sample. Marine Geophysical researches, 30(4), 265-276.
Gomaa, M.M., Shaltout, A., Boshta, M., 2009, Electrical properties and mineralogical investigation of Egyptian iron ore deposits. Materials Chemistry and Physics, 114( 1), 313-318.
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Shaltout, A.A., Gomaa, M.M. and Wahbe, M., 2012, Utilization of standard-less analysis algorithms using WDXRF and XRD for Egyptian Iron Ores identification. X-Ray Spectrometry, 41, 355-362.
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