Filters








9,876 Hits in 5.7 sec

Rock/water interaction in dielectric properties: Experiments with hydrophobic sandstones

Rosemary Knight, Ana Abad
1995 Geophysics  
In three hydrophobic samples the rock/water interaction, seen in the data for the water-wet samples, is eliminated and the dielectric constant of the partially saturated sandstones can be simply modeled  ...  Experimental data indicate that rock/water interaction, at low saturations, has a large effect on the measured dielectric response.  ...  The authors greatly appreciate the assistance of Paulette Tercier in the laboratory and Ray Rodway in the machine shop.  ... 
doi:10.1190/1.1443780 fatcat:2wo2rsaxznh43gy35k2ratjj7y

AN IMPROVISED NON-INVASIVE METHOD WITH CLUTTER REMOVAL FOR DIELECTRIC CHARACTERIZATION OF TERRESTRIAL ROCK SAMPLES AT S-BAND FREQUENCY

Anamiya Bhattacharya, Deepak Putrevu, Dharmendra Kumar Pandey, Arundhati Misra
2021 Progress In Electromagnetics Research C  
This paper presents a free-space reflection measurement technique for estimating dielectric constant and loss tangent of different materials, demonstrated for rock samples, at S-band.  ...  The estimation of dielectric properties of rock samples will be used to validate algorithms for science studies using SAR data of Chandrayaan-2 and other planetary missions.  ...  The authors are also thankful to Shri Tathagata Chakraborty, Geologist at SAC, responsible for groundtruth rock samples collection and his valuable insights regarding the samples under study.  ... 
doi:10.2528/pierc21021004 fatcat:5632dgvpgrgo3fxtucrjpmjary

A new concept in modeling the dielectric response of sandstones: Defining a wetted rock and bulk water system

Rosemary Knight, Anthony Endres
1990 Geophysics  
Each sample was fully water saturated dielectric response of dp rock and water to predict the with deionized water then dried with dielectric measure- dielectric response of  ...  dielectric response of the rock wetted by, or in equilibrium It has been clearly shown experimentally that the geome- with, the water. try of components in a porous rock containing  ... 
doi:10.1190/1.1442870 fatcat:k67rqbaocrelbp2r24enbe2jz4

Measurement of the complex permittivity of dry rocks and minerals: application of polythene dilution method and Lichtenecker's mixture formulae

Yongchun Zheng, Shijie Wang, Junming Feng, Ziyuan Ouyang, Xiongyao Li
2005 Geophysical Journal International  
Moreover, the complex permittivity of rocks and minerals measured by this method is more reliable than the direct dielectric measurement of rocks or minerals without application of the polythene dilution  ...  However, the traditional RCP method is sensitive to the measurement of low dielectric constant (ε ) and low loss factor (ε or tan δ) materials.  ...  of Sciences, and Professor Yangting Lin with the Insitute of Geology and Geophysics, Chinese Academy of Sciences.  ... 
doi:10.1111/j.1365-246x.2005.02718.x fatcat:zxd2eyyrdbholmbzodwv55nbsu

Dielectric constant as a predictor of porosity in dry volcanic rocks

A.C. Rust, J.K. Russell, R.J. Knight
1999 Journal of Volcanology and Geothermal Research  
Measurements of dielectric constant K are made on 34 samples of volcanic rocks at frequencies of 0.01 to 10 MHz Ž . Ž . Ž . under ambient atmospheric conditions.  ...  Samples of basalt show greater variance in measured values of K X , due perhaps to higher and more variable modes of Fe-Ti oxide minerals.  ...  NSERC Research Grant aOGP0820 JKR and an Ž . NSERC PGS A award ACR . The manuscript was improved by critical reviews provided by Bruce Marsh and two anonymous reviewers.  ... 
doi:10.1016/s0377-0273(99)00055-4 fatcat:x2ltfbnfnneq5imhhhdwuq73la

DIELECTRIC SPECTROSCOPY IN CRUSTAL ROCKS: PRELIMINARY RESULTS FROM NORTHEASTERN SICILY (ITALY) AND THE GULF OF CORINTH (GREECE)

D. Triantis, I. Stavrakas, C. Anastasiadis, F. Vallianatos, S. Kershaw
2004 Bulletin of the Geological Society of Greece  
Dielectric response was studied on two samples of manganese- and iron bearing rock materials of two different geological origins, one from Northeastern Sicily (Italy) and one from the Southern Gulf of  ...  The technique is based on the application of a single- frequency AC electric field to the sample and the measurement of the amplitude and phase of its response.  ...  The basic parameters of dielectric relaxation are the s s and ε^ low and highfrequency limits of relative permittivity, respectively, and the relaxation intensity s a -ε«, (or the re laxation magnitude  ... 
doi:10.12681/bgsg.16677 fatcat:7z4rzjpxpbc3jlpz553l5laiju

Experimental Research on Electrical Parameters Variation of Loaded Coal

Wang Yungang, Wei Jianping, Yang song
2011 Procedia Engineering  
The results show that electrical parameters' change curves of the loaded raw coal samples and briquette have a very good consistency; the consistency of dielectric constant curve and coal stress -strain  ...  Compared to the initial electrical parameter values of the coal samples, the electrical parameter change rate of raw coal samples and briquette are generally higher than 13%, up to 165%, the electrical  ...  Studies have shown that resistivity and dielectric constant are the main electrical parameters of underground coal rock, resistivity and dielectric constant of deformed soft coal and primary structure  ... 
doi:10.1016/j.proeng.2011.11.2252 fatcat:2346kuohlvce3cjzcf4my3cqz4

Estimation of Water Saturation in Shale Formation Using In Situ Multifrequency Dielectric Permittivity

Yongchae Cho, Sean S. Dolan, Nishank Saxena, Vishal Das, Mehdi Ostadhassan
2022 Geofluids  
The key goal of this research is to propose a workflow to evaluate an equivalent Archie's parameter which can generate the same dielectric logging tool responses with core measurement results using a given  ...  The estimated Archie's parameter from the SMD model is sensitive to the lower frequency channels of the multifrequency dielectric logging tool.  ...  Numerous lab measurements have been done to define the permittivity of rock samples. For example, Zinszner and Pellerin [11] made electrical measurements in sandstone and limestone.  ... 
doi:10.1155/2022/9491979 fatcat:hmdnfmpnzjh5bbpksqgdrmcpgm

Characterization of Rock Wettability Though Dielectric Measurements

N. Bona, E. Rossi, C. Venturini, S. Capaccioli, M. Lucchesi, P. A. Rolla
1998 Revue de l Institut Français du Pétrole  
CHARACTERIZATION OF ROCK WETTABILITY THROUGH DIELECTRIC MEASUREMENTS The wettability of glass filters and Berea sandstone was investigated using the electric response in the interval 10 2 -10 8 Hz.  ...  The dispersivity and the loss tangent were found to be the most suitable parameters to check the wettability of the samples.  ...  The electric impedance and dielectric constant of all the samples were then measured.  ... 
doi:10.2516/ogst:1998068 fatcat:kpmfooqmibcuvfpmnhrvzitfma

Dielectric relaxation behavior of Callovo-Oxfordian clay rock: A hydraulic-mechanical-electromagnetic coupling approach

Norman Wagner, Thierry Bore, Jean-Charles Robinet, Daniel Coelho, Frederic Taillade, Sylvie Delepine-Lesoille
2013 Journal of Geophysical Research - Solid Earth  
For this purpose, undisturbed and disturbed clay rock samples were conditioned to achieve a water saturation range from 0.16 to nearly saturation.  ...  High-frequency electromagnetic (HF-EM) measurement techniques, i.e., time or frequency domain reflectometry, offer useful tools for quantitative estimation of water content in porous media.  ...  He was in charge of all the samples preparation and the characterization. Moreover, the authors gratefully acknowledge the German Research Foundation (DFG) for support of the project WA 2112/2.  ... 
doi:10.1002/jgrb.50343 fatcat:vmwqdn4zubfhdp2gvgna5ettc4

Dielectric Constant Properties of Tight Sandstone

Hong qi Liu
2017 International Journal of Petrochemical Science & Engineering  
Two parameters, resistivity and permittivity or dielectricity, were investigated with tight sandstone cores.  ...  Hence, the dielectric property is much significant characteristics should be investigated in order to better understand the electric mechanism of tight rocks.  ...  (G12-3) of the State Key Lab of Oil and Gas Reservoir Geology and Exploitation of SWPU.  ... 
doi:10.15406/ipcse.2016.02.00027 fatcat:6pmwn6iagffafenxsb7ayrhr34

Dielectric Constant Properties of Tight Sandstone

Hong Qi Liu
2017 International Journal of Petrochemical Science & Engineering  
Two parameters, resistivity and permittivity or dielectricity, were investigated with tight sandstone cores.  ...  Hence, the dielectric property is much significant characteristics should be investigated in order to better understand the electric mechanism of tight rocks.  ...  (G12-3) of the State Key Lab of Oil and Gas Reservoir Geology and Exploitation of SWPU.  ... 
doi:10.15406/ipcse.2017.02.00027 fatcat:hkwjq5vzazcnhjo2iywklwhqse

Reflectance, dielectric constant and chemical content of selected sedimentary rocks

Q. J. Tian, P. Gong, B. Xu, X. Wang, H. Guo, Q. Tong
2002 International Journal of Remote Sensing  
of 34 sedimentary rock samples were measured.  ...  The average real part of the dielectric constant is highly correlated with the weight loss of the rocks due to burning (burnt loss) (r=0.92), SiO 2 (r= 0.96), and CaO (r=0.91).  ...  Gong) by NSF of China (49825511).  ... 
doi:10.1080/01431160210153976 fatcat:oaubixg3fvdrflpacsdrvsejfu

Electro-physical Properties of Super-thin Basalt Fiber Chemically Modified by Hydrochloric or Sulphuric Acid

Sergey K. Nikoghosyan, Aram A. Sahakyan, Vasak B. Gavalyan, VachaganV. Harutyunyan, Aghasi S. Hovanisyan, Hrant.N. Yeritsyan, Vovik. A. Atoyan, Konstantin I. Puskulyan, Mark Gerchikov, Narek V. Hakobyan, Artur V. Hovhannisyan
2011 Journal of Modern Physics  
Specific electric resistance for direct ρ dc and alternating ρ ac currents, dielectric parameters of ε' and ε" were measured.  ...  It is shown that specific resistance and dielectric parameters of super-thin basalt fiber change essentially after hydrochloric or sulphuric acid treatment.  ...  Acknowledgements This work was supported by International Science and Technology Center (ISTC) Project No. A-1605. The authors are grateful for this assistance. References  ... 
doi:10.4236/jmp.2011.212179 fatcat:3agkm5xvtrdrzcwiehbrk2pz7q

Macroscopic dielectric constant for microstructures of sedimentary rocks

Rudolf Hilfer, Jack Widjajakusuma, Bibhu Biswal
2000 Granular Matter  
An approximate method to calculate dielectric response and relaxation functions for water saturated sedimentary rocks is tested for realistic three-dimensional pore space images.  ...  The approximate method is based on image analysis and local porosity theory. An empirical rule for the specification of the length scale in local porosity theory is advanced.  ...  These parameters determine which information about the microstructure can be obtained from measurements of the effective dielectric constant.  ... 
doi:10.1007/s100359900035 fatcat:2n4lv2k73jg7bdblzpnd76mnwy
« Previous Showing results 1 — 15 out of 9,876 results