AC Impedance Method for High‐Resistivity Measurements of Silicon

1991 ◽  
Vol 138 (10) ◽  
pp. 3081-3085 ◽  
Author(s):  
W. R. Thurber ◽  
J. R. Lowney ◽  
R. D. Larrabee ◽  
J. R. Ehrstein
Keyword(s):  
Ac Impedance ◽  
Impedance Method ◽  
High Resistivity ◽  
Resistivity Measurements

scholarly journals Electrochemical Property of Ti1-xCrxN Films Evaluated by the AC Impedance Method.

2000 ◽  
Vol 120 (3) ◽  
pp. 328-334 ◽  
Author(s):  
Isao Nakamura ◽  
Ichiro Takano ◽  
Yoshio Sawada ◽  
Eiichiro Nakazawa
Keyword(s):  
Electrochemical Property ◽  
Ac Impedance ◽  
Impedance Method

scholarly journals Evaluation of Delamination of Coated Stainless Steels with a Macroscopic Defect by AC Impedance Method

1996 ◽  
Vol 45 (5) ◽  
pp. 292-297 ◽  
Author(s):  
Hideki Katayama ◽  
Atsushi Nishikata ◽  
Tooru Tsuru
Keyword(s):  
Stainless Steels ◽  
Ac Impedance ◽  
Impedance Method ◽  
Macroscopic Defect

Diffusion of Charged Species in Metal Oxides and Polymeric Solids Using AC Impedance Technique

2011 ◽  
Vol 312-315 ◽  
pp. 1216-1221
Author(s):  
Norlida Kamarulzaman ◽  
Roshidah Rusdi ◽  
Nor Diyana Abdul Aziz ◽  
Lili Widarti Zainudin ◽  
Zurina Osman
Keyword(s):  
Electrical Properties ◽  
Metal Oxides ◽  
Analytical Techniques ◽  
Ac Impedance ◽  
Impedance Method ◽  
Electrical Measurements ◽  
Charged Species ◽  
Impedance Technique ◽  
Properties Of Materials ◽  
Kinetics Of

The diffusion of charged species in solids is a very important part of the study of the electrical properties of materials. Electrical measurements using alternating current (ac) impedance is a powerful technique to study diffusing species in metal oxides as well as polymers. Three case studies are being presented here whereby the electrical properties of LiTaO3, Poly[2-methoxy-5-(2’-ethylhexyloxy)-(p-phenylenevinylene)] (MEH-PPV) and its composite are being studied using the same ac impedance technique. LiTaO3 is a metal oxide while MEH-PPV is a polymer. They are very different and therefore present very good examples for the versatility and power of ac impedance method. Electrical parameters such as conductivity and conduction behaviours of the conducting species can be extracted from the studies. The kinetics of the diffusing species can be elucidated by using proper analytical techniques.

Rock quality assessment using the effect of mud-filtrate invasion on conflicting borehole resistivity measurements

Geophysics ◽  
2012 ◽  
Vol 77 (3) ◽  
pp. WA65-WA78 ◽  
Author(s):  
Jesús M. Salazar ◽  
A. Jeff Martin
Keyword(s):  
Wettability Alteration ◽  
Rock Properties ◽  
High Resistivity ◽  
Tight Gas ◽  
Resistivity Measurements ◽  
Rock Quality ◽  
Sandstone Reservoir ◽  
The Difference ◽  
Mud Filtrate ◽  
Tight Gas Sandstone

Unexpected borehole measurements are often inaccurately interpreted due to limited knowledge of the formation, particularly in tight-gas unconventional reservoirs. A novel method was applied to determine reservoir quality and the reliability of borehole array-induction resistivity measurements in a tight gas sandstone reservoir. Four exploration wells drilled with synthetic oil-based mud showed conflicting resistivity profiles. The discovery well showed a conductive invasion profile, but the appraisal wells showed resistive profiles. Simulation of oil-based mud-filtrate invasion was coupled with forward simulation and inversion of array-induction resistivity measurements to determine the difference in such resistivity profiles. Laboratory measurements on rock core and fluid samples were used to calibrate a log-based petrophysical model that was necessary to simulate the physics of fluid-flow mud-filtrate invasion. The dynamic process of invasion was simulated with a multicomponent formulation for the hydrocarbon phase and rock wettability alteration effects due to surfactants present in the mud. Simulated borehole-resistivity measurements were compared to field logs, and the rock properties were modified to secure a close agreement between simulated and field logs. The different invasion profiles corresponded to variable rock quality and mud composition. In the discovery well, good rock quality and thick surfactants in the mud caused a low mobility ratio between filtrate and native fluids, which created a water bank that moved ahead into the formation. This effect created a conductive annulus in the near-wellbore region. In turn, the deep invasion and high resistivity are due to excellent rock quality that is typical of a conventional sandstone reservoir. The shallower invasion and resistive profiles in the delineation wells suggest the tight gas sandstone reservoir we expected to find throughout the formation.

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