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Evaluating the Impact of Hydraulic Fracturing on Streams using Microbial Molecular Signatures
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Evaluation of underground hydraulic fracturing using transient electromagnetic method.

Xiaoguang Wang1,2

  • 1State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China. Dwanxg@163.com.

Environmental Science and Pollution Research International
|February 28, 2019
PubMed
Summary

Transient electromagnetic tests effectively determined the hydraulic fracturing influence range, identifying water-cut areas and boosting gas extraction by up to 70%. This method enhances the evaluation of fracturing effectiveness in coal seams.

Keywords:
Electromagnetic radiationFracturing areaHydraulic fracturingLow-resistance zone

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Area of Science:

  • Geophysics
  • Petroleum Engineering
  • Mining Engineering

Background:

  • Hydraulic fracturing is crucial for enhancing resource recovery in underground formations.
  • Evaluating the effective area of hydraulic fracturing is essential for optimizing extraction processes.
  • Understanding the impact on water content and gas extraction is key to assessing fracturing success.

Purpose of the Study:

  • To determine the influential range of underground hydraulic fracturing using transient electromagnetic tests.
  • To detect water-cut areas and assess gas extraction efficiency post-fracturing.
  • To establish a method for defining and evaluating the effective area of hydraulic fracturing.

Main Methods:

  • Transient electromagnetic tests were conducted to analyze resistivity changes in coal seams.
  • Apparent resistivity variations before and after fracturing were mapped to define the influence range.
  • Water content and gas extraction tests were performed to quantify the effects of fracturing.

Main Results:

  • Water-cut areas were identified in low-resistance zones, with variations in amplitude indicating fracturing extent.
  • The effective hydraulic fracturing influence range was determined to be approximately 35 meters.
  • Gas extraction concentration increased significantly, averaging 70.22%, with effective fracturing zones extending up to 38 meters.

Conclusions:

  • Transient electromagnetic testing provides a reliable method for evaluating the effective fracturing range.
  • Hydraulic fracturing effectively increases water content and significantly enhances gas extraction efficiency.
  • The findings contribute to improving the evaluation system for hydraulic fracturing effects in coal seams.