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Related Concept Videos

Resistivity01:22

Resistivity

When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential ensures...

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Related Experiment Video

Updated: May 12, 2026

Soil Lysimeter Excavation for Coupled Hydrological, Geochemical, and Microbiological Investigations
10:30

Soil Lysimeter Excavation for Coupled Hydrological, Geochemical, and Microbiological Investigations

Published on: September 11, 2016

Resistivity method-based rock core orientation experimental protocol.

Jiahuan He1,2,3, Zhijuan Tang1,3, Qiang Kang1

  • 1Exploration and Development Research Institute, Southwest Oil and Gas Field Company, PetroChina, Chengdu, Sichuan, China.

Plos One
|March 2, 2026
PubMed
Summary
This summary is machine-generated.

A new non-destructive method uses radial resistivity measurements to orient subsurface rock cores. This technique improves efficiency and accuracy for geological and geomechanical analysis.

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Pore-scale Imaging and Characterization of Hydrocarbon Reservoir Rock Wettability at Subsurface Conditions Using X-ray Microtomography

Published on: October 21, 2018

Area of Science:

  • Geophysics
  • Petroleum Geology
  • Geological Engineering

Background:

  • Accurate subsurface characterization relies on proper core orientation, which is challenging for conventional drilling methods.
  • Over 99% of rock cores are acquired using traditional drilling, often lacking precise orientation data.
  • Existing orientation methods can be time-consuming and require specialized software.

Purpose of the Study:

  • To introduce a novel, non-destructive method for orienting cylindrical rock cores obtained through conventional drilling.
  • To provide a direct correlation between core measurements and downhole logs, bypassing the need for image-matching software.
  • To enhance the efficiency and scalability of core orientation for geological and geomechanical studies.

Main Methods:

  • Utilizing discrete radial resistivity measurements on full-diameter cylindrical cores.
  • Directly correlating azimuthal resistivity values with downhole electrical imaging logs.
  • Implementing a non-destructive technique to preserve core integrity.

Main Results:

  • Achieved an orientation accuracy of ±15° in anisotropic reservoirs (Well ST12).
  • Reduced measurement time to under 8 hours per sample.
  • Increased operator throughput to approximately 150 samples annually, a 3-3.75-fold efficiency gain.
  • Demonstrated improved measurement accuracy as needed.

Conclusions:

  • The proposed resistivity-based method offers a cost-effective and scalable solution for orienting conventionally acquired cores.
  • This technique enables enhanced geological and geomechanical analysis by providing reliable core orientation.
  • The non-destructive nature and efficiency gains make it widely applicable in subsurface characterization.