The document discusses electrical resistivity methods for measuring the resistivity of rocks. It defines key concepts like resistance, resistivity, and conductivity. Rock resistivity is influenced by factors like metallic sulfide content, porosity, clay content, pore saturation, and water salinity. Various electrode arrays like Wenner and Schlumberger are used to measure resistivity in the subsurface. Resistivity can provide information about rock properties and subsurface structures and fluids.
EIS is a powerful method of analyzing the complex electrical resistance of a system ( is sensitive
to surface phenomena and changes of bulk properties) It can be used to determine semi-quantitative parameters of electrochemical processes occurring
at electrode surfaces
➣ Electron Drift Velocity
➣➣➣ Charge Velocity and
Velocity of Field Propagation
➣➣➣ The Idea of Electric Potential
Resistance
➣➣➣ Unit of Resistance
➣➣➣ Law of Resistance
➣➣➣ Units of Resistivity
Conductance and
Conductivity
➣➣➣ Temperature Coefficient of
Resistance
➣➣➣ Value of α at Different
Temperatures
➣➣➣ Variation of Resistivity with
Temperature
➣➣➣ Ohm’s Law
➣➣➣ Resistance in Series
➣➣➣ Voltage Divider Rule
➣➣➣ Resistance in Parallel
➣➣➣ Types of Resistors
➣➣➣ Nonlinear Resistors
➣➣➣ Varistor
➣➣➣ Short and Open Circuits
➣➣➣ ‘Shorts’ in a Series Circuit
➣➣➣ ‘Opens’ in Series Circuit
➣➣➣ ‘Open’s in a Parallel Circuit
➣➣➣ ‘Shorts’ in Parallel Circuits
➣➣➣ Division of Current in Parallel
Circuits
➣➣➣ Equivalent Resistance
➣➣➣ Duality Between Series and
Parallel Circuits
➣➣➣ Relative Potential
EIS is a powerful method of analyzing the complex electrical resistance of a system ( is sensitive
to surface phenomena and changes of bulk properties) It can be used to determine semi-quantitative parameters of electrochemical processes occurring
at electrode surfaces
➣ Electron Drift Velocity
➣➣➣ Charge Velocity and
Velocity of Field Propagation
➣➣➣ The Idea of Electric Potential
Resistance
➣➣➣ Unit of Resistance
➣➣➣ Law of Resistance
➣➣➣ Units of Resistivity
Conductance and
Conductivity
➣➣➣ Temperature Coefficient of
Resistance
➣➣➣ Value of α at Different
Temperatures
➣➣➣ Variation of Resistivity with
Temperature
➣➣➣ Ohm’s Law
➣➣➣ Resistance in Series
➣➣➣ Voltage Divider Rule
➣➣➣ Resistance in Parallel
➣➣➣ Types of Resistors
➣➣➣ Nonlinear Resistors
➣➣➣ Varistor
➣➣➣ Short and Open Circuits
➣➣➣ ‘Shorts’ in a Series Circuit
➣➣➣ ‘Opens’ in Series Circuit
➣➣➣ ‘Open’s in a Parallel Circuit
➣➣➣ ‘Shorts’ in Parallel Circuits
➣➣➣ Division of Current in Parallel
Circuits
➣➣➣ Equivalent Resistance
➣➣➣ Duality Between Series and
Parallel Circuits
➣➣➣ Relative Potential
Dielectric Properties of Insulating Materialsrajendra purkar
Dielectric Properties of Insulating Materials, in Material Science
different material used in Power system as Insulators and their required properties and applications.
Dielectric Properties of Insulating Materialsrajendra purkar
Dielectric Properties of Insulating Materials, in Material Science
different material used in Power system as Insulators and their required properties and applications.
Ideal for school presentations, and contains a lot of interesting information. This presentation is contains good animations to make it interesting. Please forgive me for the small spelling mistakes that I have made.
The presentation describes the use of Ohmmeters in Industries having Flexible Manufacturing System. The classification of ohmmeters - Megohmmeters and Micro-ohmmeters. It's obvious that ohmmeters available and used today are of digital type. It was a seminar topic in Flexible Manufacturing System given to us.
5 Warning Signs Your BMW's Intelligent Battery Sensor Needs AttentionBertini's German Motors
IBS monitors and manages your BMW’s battery performance. If it malfunctions, you will have to deal with an array of electrical issues in your vehicle. Recognize warning signs like dimming headlights, frequent battery replacements, and electrical malfunctions to address potential IBS issues promptly.
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Experiencing difficulty opening your BMW X3's hood? This guide explores potential issues like mechanical obstruction, hood release mechanism failure, electrical problems, and emergency release malfunctions. Troubleshooting tips include basic checks, clearing obstructions, applying pressure, and using the emergency release.
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𝘼𝙣𝙩𝙞𝙦𝙪𝙚 𝙋𝙡𝙖𝙨𝙩𝙞𝙘 𝙏𝙧𝙖𝙙𝙚𝙧𝙨 𝙞𝙨 𝙫𝙚𝙧𝙮 𝙛𝙖𝙢𝙤𝙪𝙨 𝙛𝙤𝙧 𝙢𝙖𝙣𝙪𝙛𝙖𝙘𝙩𝙪𝙧𝙞𝙣𝙜 𝙩𝙝𝙚𝙞𝙧 𝙥𝙧𝙤𝙙𝙪𝙘𝙩𝙨. 𝙒𝙚 𝙝𝙖𝙫𝙚 𝙖𝙡𝙡 𝙩𝙝𝙚 𝙥𝙡𝙖𝙨𝙩𝙞𝙘 𝙜𝙧𝙖𝙣𝙪𝙡𝙚𝙨 𝙪𝙨𝙚𝙙 𝙞𝙣 𝙖𝙪𝙩𝙤𝙢𝙤𝙩𝙞𝙫𝙚 𝙖𝙣𝙙 𝙖𝙪𝙩𝙤 𝙥𝙖𝙧𝙩𝙨 𝙖𝙣𝙙 𝙖𝙡𝙡 𝙩𝙝𝙚 𝙛𝙖𝙢𝙤𝙪𝙨 𝙘𝙤𝙢𝙥𝙖𝙣𝙞𝙚𝙨 𝙗𝙪𝙮 𝙩𝙝𝙚 𝙜𝙧𝙖𝙣𝙪𝙡𝙚𝙨 𝙛𝙧𝙤𝙢 𝙪𝙨.
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Wondering if Your Mercedes EIS is at Fault Here’s How to Tell
RESIATANCE
1. 1
Electrical Properties of Rocks
and
Electrical Resistivity Methods
Resistance
Definition of an OHM
An ohm is a resistance in a conductor that produces a
potential difference of one volt when a current of one
ampere is flowing through it.
R =
Ohm’s Law
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/ohmlaw.html#c1
Resistance vs Resistivity
Resistance is relevant only to a particular
measurement circuit. Units: ohms
Resistivity is an intrinsic property of all
physical materials Units: ohm-meters
Apparent Resistivity is a resistivity estimate based on a
assuming a half-space geometry. Units: ohm-meters
Electrical Resistivity vs
Electrical Conductivity
Conductivity = σ = 1/ρ (mho/meters)
Resistance = ρ (ohm-meters)
Calculating Resistance from
Resistivity
• http://www.cflhd.gov:80/agm/index.htm
2. 2
Factors Influencing Electrical
Conductivity in Rocks
Metallic Sulfide Mineral Content
Porosity (connected/effective - fractures or pores)
Clay Content
Pore saturation (% air or gas)
Water salinity (TDS)
Hydrocarbon Fluid Saturation
Rock Matrix intrinsic resistivity
Fluid temperature
Archie’s Law
Formation Factor
The conductivity of most geological formations can be fit
to Archie’s Law
Influence of Permeability
A rock with a non-conducting matrix must be permeable (connected pores) as well as porous to
conduct electricity.
Darcy's Law:
Ohm's Law:
where
Despite the similarity between Darcy’s and Ohm’s Laws, electric currents have zero
viscosity so even a narrow crack can provide an effective electrical connection between pores that not contribute to hydraulic
permeability.
Comparison of electric and
hydraulic properties.
Avg. hydraulic conductivities:
Kl, Kt
Average aquifer resistivities:
ρl, ρt
Leakance:
Lh=Σki/hi = Kt/H
Longitudinal conductance:
S= Σhi/ρi = H/ρl
Transmissivity:
Th = Σhiki= KlH
Transverse resistance:
T = Σ hiρi = Hρl
HydraulicElectrical
• http://www.cflhd.gov:80/agm/index.htm
3. 3
Electrical resistivity of rocks
with various wt % of sulfide.
Metallic Sulfide
Mineral Content
• http://www.cflhd.gov:80/agm/index.htm
Effect of Water Temperature
http://appliedgeophysics.berkeley.edu:7057/dc/figures/fig43_7.jpg
Conductivity Ranges of Various Materials
http://www.cflhd.gov:80/agm/index.htm
http://www.cflhd.gov:80/agm/index.htm
http://www.cflhd.gov:80/agm/index.htm
http://www.cflhd.gov:80/agm/index.htm
4. 4
Resistance vs Resistivity
Resistance is relevant only to a particular
measurement circuit. Units: ohms or Ω
Resistivity is an intrinsic property of all
physical materials Units: ohm-meters or Ω-m
Apparent Resistivity is a resistivity estimate based on a
assuming a half-space geometry. Units: ohm-meters or Ω-m
Calculating Resistance from
Resistivity
• http://www.cflhd.gov:80/agm/index.htm
Four Electrode Resistivity Measurement on
rock sample
… are used to avoid electrode contact resistance effects
seen in two electrode measurements.
C1 C2
current I
P1 P2
Four electrode resistivity arrays
http://www.cflhd.gov/agm/images/fig90.jpg
The Basic
Concept of an
Earth
Resistivity
Measurement
http://www.cflhd.gov/agm/images/fig91.jpg
Electrode Contact Resistance is typically much
higher than the intrinsic earth resistivity
5. 5
Electrode Contact Resistance is concentrated
around each electrode
If a standard two electrode resistivity meter were
used to measure the earth’s “resistance” we only
obtain information on the quality of the electrode
contacts – not the earth’s resistivity
http://appliedgeophysics.berkeley.edu:7057/dc/em44.pdf
Pole-Pole Array Pole-Dipole Array
http://appliedgeophysics.berkeley.edu:7057/dc/em44.pdf
Pole-Dipole Array
http://appliedgeophysics.berkeley.edu:7057/dc/em44.pdf
Wenner Array
http://appliedgeophysics.berkeley.edu:7057/dc/em44.pdf
13. 13
Fig. 5.33g (a) Fig. 5.33g (b)
Fig. 5.33g (c) Fig. 5.39g
One point removed
14. 14
C:Shortcut to Geo-CD-ROM.exe
Airborne EM Resistivity Airborne EM Resistivity
http://ece.uprm.edu/~pol/waves_review.pdf
http://appliedgeophysics.berkeley.edu:7057/dc/archie/index.html