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Pole-Pole Array: Electrical Resistivity Methods, Part 5

Posted by hasan on Oct 06, 2017

Electrode arrays are different arrangements of electrodes used to perform geophysical resistivity measurements. Electrode arrays were developed in order to make field measurements more efficient and data interpretation easier.

Today, we’re discussing the pole-pole electrode configuration—this is the fifth article in our series exploring 11 electrode arrays and methods. We’ve also covered the following:

AGI Pole-Pole Array Example

Pole-Dipole Array: Electrical Resistivity Methods, Part 4

Posted by hasan on Oct 06, 2017

Electrode arrays are different arrangements of electrodes used to perform geophysical resistivity measurements. Electrode arrays were developed in order to make field measurements more efficient and data interpretation easier.

Today, we’re discussing the pole-dipole array—this is the fourth article in our series exploring 11 electrode arrays and methods. We’ve also covered the following:

AGI Pole-Dipole Array Example

Dipole-Dipole​ ​Array:​ ​Electrical​ ​Resistivity​ ​Methods,​ ​Part​ ​3

Posted by hasan on Oct 06, 2017

Electrode arrays are different arrangements of electrodes used to perform geophysical resistivity measurements. Electrode arrays were developed in order to make field measurements more efficient and data interpretation easier.

Today, we’re discussing the dipole-dipole array—this is the third article in our series exploring 11 electrode arrays and methods. We’ve also covered the following:

AGI The Dipole-Dipole Array Example

Schlumberger Array: Electrical Resistivity Methods, Part 2

Posted by hasan on Oct 06, 2017

Electrode arrays are different arrangements of electrodes used to perform geophysical resistivity measurements. Electrode arrays were developed in order to make field measurements more efficient and data interpretation easier.

This is the second article in our series exploring 11 electrode arrays and methods. We’ve also covered the Wenner array. Today, we’re discussing the Schlumberger array.

 

What is the Schlumberger array?

The Schlumberger array is an array where four electrodes are placed in line around a...

AGI The Schlumberger Array Example

Wenner Array: Electrical Resistivity Methods, Part 1

Posted by hasan on Oct 06, 2017

Electrode arrays are different arrangements of electrodes used to perform geophysical resistivity measurements. Electrode arrays were developed in order to make field measurements more efficient and data interpretation easier. In this series, we’ll explore 11 electrode arrays. The first array we’ll discuss is the Wenner array.

 

What is the Wenner array?

The Wenner electrode array is the simplest of arrays; in it, the four electrodes—A, M, N, and B—are placed in line and spaced equidistant from each other. The two outer electrodes, A and B, are current electrodes,...

AGI The Wenner Array Example

A Comparison Of 11 Classical Electrode Arrays

Posted by hasan on Oct 06, 2017

Electrode arrays can be defined as various arrangements of electrodes used to perform geophysical resistivity measurements. These arrays were developed before computers and modern algorithms were available in order to make field measurements more efficient and data interpretation easier. Even with today’s automatic resistivity imaging instruments, these arrays are still used in order to ensure an even coverage of data points.

There are a number of different arrays, but only a few have been important and frequently used. These include the Schlumberger array, the Wenner array, and the...

The Streaming-Potential Method: Its 2 Main Uses

Posted by markus on Feb 28, 2017

Streaming-potential (SP) is an electrical surveying method used when fluids or electrolytes—typically water—move through porous areas in the the ground. This creates a change in voltage that can be read using a voltmeter and two electrodes. Streaming-potential is synonymous with “self-potential” and “spontaneous-potential,” though the latter two designations are used when the cause of the spontaneous voltage is chemical processes associated...

An Overview Of The Self-Potential (Spontaneous-Potential) Method

Posted by markus on Feb 15, 2017

Before we dive into details, let’s start with a primer on three different terms that are abbreviated “SP.” In this article, we’ll be discussing self-potential, which is synonymous with spontaneous-potential. The self-potential method in geophysics refers to an electrical surveying method used for looking at electrical anomalies in the ground. It is primarily used in mineral exploration. Streaming-potential, on the other hand, is caused by a fluid —typically water with dissolved minerals (an electrolyte)—moving in the ground, which causes a change in voltage. This change is detected when a...

A Closer Look At 3D Resistivity Surveys

Posted by markus on Feb 14, 2017

One-dimensional (1D) resistivity surveys are not ideal because they assume that the geological layers are horizontal and homogeneous—which is rarely the case. Two-dimensional (2D) resistivity surveys are an improvement but still an approximation, as they assume the geology continues infinitely in both directions perpendicular to the survey line. While this method is more accurate than the 1D Vertical Electrical...

3D Time-Lapse Surveys: Watching Resistivity Change Over Time

Posted by markus on Feb 13, 2017

The three-dimensional (3D) time-lapse resistivity survey is the holy grail of resistivity surveys. It is an extremely accurate and effective method that allows you to not only see the surveyed area in three dimensions—but also how the resistivity in the surveyed area changes over time. 

Method, Technology, & Applications

To perform a 3D time-lapse resistivity survey, you place your electrodes in a grid and record multiple surveys over an extended period of time. Using AGI’s ...

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