1887
  1. Home
  2. Conferences
  3. Conference Proceedings
  4. 24th European Meeting of Environmental and Engineering Geophysics
  5. Conference paper

Abstract

Summary

Electrical resistivity method of crossed square array was used to delineate subsurface fractures and estimate the secondary porosity in gneissic rocks (migmatite, granite and banded gneiss) of southwestern Basement Complex of Nigeria.

Resistivity measurements were carried out at ten (10) locations using Ohmega resistivity meter, survey was done about a common center with an electrode array expanded in four different azimuths namely 0°, 45°, 90°and 135°, at electrode spacing increment of A(2)1/2. The coefficient of anisotropy, azimuthal inhomogeneity ratio (AIR), azimuthal resistivity, fracture strike, bedrock anisotropy, and secondary porosity were then calculated from the measured apparent resistivity.

The study revealed that the measured apparent resistivity varies with the orientation of the array indicating fracture anisotropy in the subsurface. The results also showed the presence of fracture zone which are mainly oriented NE –SW direction, with few in the NW – SE direction. The coefficient of anisotropy (λ) ranges between 0.51 and 2.38, bedrock anisotropy (N) varies from 1.006 to 1.58 while calculated secondary porosity ranges between 0.00006 to 0.112.

Crossed square array data analyses evidently indicate the presence of multiple subsurface fracture zones and showed that the study area has good potentials for groundwater development.

© EAGE Publications BV
Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201802599
2018-09-09
2024-04-24

  • From This Site

    /content/papers/10.3997/2214-4609.201802599
    dcterms_title,dcterms_subject,pub_keyword
    -contentType:Journal -contentType:Contributor -contentType:Concept -contentType:Institution
    10
    5
Loading full text...

Full text loading...

References

  1. Busby, J.P.
    , (2000). The effectiveness of azimuthal apparent-resistivity measurements as a method for determining fracture strike orientations. Geophysical Prospecting, 48(4): 677–695.
     [Google Scholar]
  2. EhirimC.N, EssienE.E
    (2009) Comparative investigation of offset Wenner, square and Schlumberger arrays in electrical anisotropystudies. Scientia Africa8(2): 53–60
     [Google Scholar]
  3. RamanujamN., Nathakiti MuruganK., and Antony RavindranA.
    (2006). Azimuthal square array resistivity studies to infer active faults zones in the areas of known seismicity, Kerala- A case study. Jlnd. Geophysc. Union Vol 10, NO. 3, pp. 197–208.
     [Google Scholar]
  4. Olorunfemi, M.O. and S.A.Fasuyi
    . (1993). “Aquifer Types and Geoelectric/Hydrogeologic Characteristics of Part of Central Basement Terrain of Nigeria (Niger State)”. J. Africa Earth Sci.16(3): 309–317.
     [Google Scholar]
  5. RahamanM.A.
    (1981). Recent Advances in the Study of the Basement Complex of Nigeria. First Symposium on the recambrian Geology of Nigeria, Summary.
     [Google Scholar]
  6. Habberjam, G.M.
    (1972) the effects of anisotropy on square array resistivity measurements. Geophysical Prospect23:249–266.
     [Google Scholar]
  7. (1975) Apparent Resistivity, Anisotropy and strike measurements. Geophysical Prospectinfvang. 23, 211–247
     [Google Scholar]
  8. Habberjam, G.M. and Watkins, G.E.
    (1967) the use of square configuration in resistivity prospecting. Geophysical Prospecting, 15, 221–235.
     [Google Scholar]
  9. Lane, J.W.Jr., Haeni, F.P. & Watson, W.M.
    (1995). Use of a square-array and direct-current resistivity method to detect fractures in crystalline bedrock in New Hampshire. Ground Water, 33(3): 476–485.
     [Google Scholar]
  10. OlasehindeP. I. and BayewuO. O.
    (2011) Evaluation of electrical resistivity anisotropy in geological mapping: a case study of Odo Ara, West Central Nigeria. Afr. J. Environ. Sci. Technol.5(7):553–566.
     [Google Scholar]
  11. Taylor, R.W. and Fleming, A.H.
    (1988), Characterizing jointed systems by azimuthal resistivity surveys: Ground Water, 26, 464–474.
     [Google Scholar]
  12. SkjernaaL, JorgensenN.O
    (1993) Evaluation of Local Fracture Systems by Azimuthal Resistivity Surveys. Examples from south Norway, Int. J Application of Hydrogeology2: 19–25.
     [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201802599
Loading
Fracture Detection and Secondary Porosity Estimation in Basement Terrain Using Crossed Square Array Resistivity Method
Conference Proceedings 2018, 1 (2018); https://doi.org/10.3997/2214-4609.201802599
/content/papers/10.3997/2214-4609.201802599
/content/papers/10.3997/2214-4609.201802599
Loading

Data & Media loading...

Most Cited This Month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error