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Environmental Geology

, Volume 50, Issue 8, pp 1221–1233 | Cite as

Model tank electrical resistivity characterization of LNAPL migration in a clayey-sand formation

  • A. A. AdepelumiEmail author
  • A. A. Solanke
  • O. B. Sanusi
  • A. M. Shallangwa
Original Article

Abstract

A modeling tank time-lapse 2D electrical resistivity experiment was undertaken to model the leakage of petroleum products from underground pipelines into a clayey-sand aquifer. Numerical modeling was employed to simulate the electrode arrays that would resolve the post-leakage subsurface image most efficiently. Of the four arrays tested, the dipole–dipole array proved most effective and was adopted for the laboratory studies. Pre-injection surveys were conducted to assist in discriminating between features caused by hydrocarbon accumulation and those due to natural geologic variability. Subsequently, controlled injection of diesel–oil into the model tank was undertaken at regular intervals over a period of 3 days. Experimental evidence obtained from the studies indicates that high resistivity build up few hours after injection is directly related to hydrocarbon accumulation. Rather than biodegradation of the hydrocarbon, a more probable explanation for the observed decrease in resistivity observed a few hours after injection is simply that the hydrocarbons drained to a deeper level after pooling temporarily at a shallow level.

Keywords

Model tank Resistivity Leakage Hydrocarbon Modeling 

Notes

Acknowledgments

The first author is grateful to the Korea Institute of Geoscience and Mineral Resources, Daejeon, South Korea for releasing their electrical resistivity modeling and inversion program to the first author. We also thank Professor M.O. Olorunfemi of the department of Geology, Obafemi Awolowo University, Ile-Ife, Nigeria for allowing us to use the model tank in his laboratory. The authors are deeply grateful for their support.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • A. A. Adepelumi
    • 1
    Email author
  • A. A. Solanke
    • 1
  • O. B. Sanusi
    • 1
  • A. M. Shallangwa
    • 1
  1. 1.Department of GeologyObafemi Awolowo UniversityIle-IfeNigeria

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