APPICATION OF GEOELECTRICAL RESISTIVITY IMAGING TO INVESTIGATE GROUNDWATER POTENTIAL
ABSTRACT
 Geoelectrical resistivity imaging using both 2D and Vertical Electrical Sounding (1D) method was carried out in Atan , Ado/Odo Ota Local Government, Ogun State ,Nigeria using the PAS earth resistivity meter.Three profiles was carried out using both Wenner and Schlumberger array configuration. The data was interpreted using RES2DINV for 2D and computer iteration method (WinResist) for VES. Results showed that there are five major layers which described the geological structure of the study area. The resistivity values ranges between 1200Ωm to 4000Ωm,
500Ωm to 1000Ωm, 400Ωm to 800Ωm , 200Ωm to 400Ωm and 60.7 Ωm to approximately 100Ωm respectively according to the structures. VES1,VES 2, VES 3 and VES 4 apparent resistivity curve shows the different layers with their corresponding thicknesses. The study area revealed that the depth to the aquifer ranges between 130m t0 140m.
TABLE OF CONTENTS
Certification ii
Dedication iii
Acknowledgements iv-v
List of Tables viii
List of Figures viii -ix
Abstracts x
CHAPTER ONE
1.1 Introduction 1 – 3
1.2 Geological Description of Underground Water 3 – 4
1.2.1 Occurrence of Groundwater 4
1.2.2 The movement of Groundwater 5 – 6
1.2.3 Transmission of Groundwater 6 – 8
1.2.4 Recharge 8
1.2.5 Leakage 8 – 9
1.2.6 Withdrawal 9
1.2.7 Aquifers 9- 11
1.3 Location of the study area 12
1.4 Aim and Objectives 14
1.5 Scope of the Study 14
1.6 Justification of the study 14
CHAPTER TWO
2.1 Literature Review and Geological Setting 15-21
2.2 Geological Setting of the study area. 21-22
CHAPTER THREE
3.1 Electrical Resistivity Theory and Methodology 23
3.1.1 Single Current Electrode at Depth 24
3.1.2 Single Current Electrode at Surface 25
3.1.3 Two Current Electrode at the Surface 25
3.2 Apparent Resistivity and Electrode Configuration 25 ” 26
3.3 Resistivity Survey 27 – 28
3.4 Field Measurement Procedure 28- 30
3.5 The Field Work Procedure 30-34
CHAPTER FOUR
4.1 Results and Interpretation 35-36
4.2 Data Collected for Profile 1 37-40
4.3 Data Collected for Profile 2 41-44
4.4 Data Collected for Profile 3 44
CHAPTER FIVE
5.1 Result, Discussion, Conclusion and Recommendation 45
5.1.1 Profile 1 Discussion 45-47
5.1.2 Profile 2 Discussion 48-50
5.1.3 Profile 3 Discussion 51-53
5.2 Conclusion 54
5.3 Recommendation 54-55
5.4 Contribution to Knowledge 55
References 56-61
APPENDIX
