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CORRELATIVE ANALYSIS OF BOREHOLE LOGS AND GEO-ELECTRIC SECTION WITH LITHOLOGY IN IBADAN SOUTH WESTERN NIGERIA
Categories
Table of contents
CHAPTER ONE
1.0 Introduction 1
1.1 General statement 1
1.2 Aim and Objectives 2
1.5 Review of previous work 5
CHAPTER TWO
2.0 Geologic setting 7
2.1 Regional geology 7
2.1.1 The basement complex 11
2.1.1.1 Migmatite-gneiss-quartz complex 11
2.1.1.2 Schist Belt 12
2.1.1.3 Charnokitic, Gabbroic and Dioritic rocks 14
2.1.1.4 Older granites 14
2.2 Evolution and geochronology 15
2.3 Geology of south western Nigeria 15
2.3 Geology of the study area 16
CHAPTER THREE
3.0 Methodology 16
3.1 Field procedures 16
3.2 Collection of data 16
3.3 Methodology for schlumberger 17
3.3.1 Electrode Separation and Instrumentation 17
3.3.2 Treatment of Data 18
3.3.3 Summary of field precautions 18
3.3.4 Theoretical Background 19
3.3.5 Interpretation of Resistivity Soundings 21
3.3.5.1 One-dimensional interpretation 21
3.3.5.2 Auxiliary point Method 21
3.3.5.3 Inversion method 22
3.3.6 Instrumentation 24
CHAPTER FOUR
4.0 Result and discussion 27
4.1 Resistivity and layers 27 4.2 Correlation of Borehole Log with Resistivity Data 32
4.3 Correlation of resistivity geoelectric setion 64
4.3.1 Interpretation of transverse one (1) 64
4.3.2 Interpretation of transverse two (2) 66
4.3.3 Interpretation of transverse three (3) 66
4.3.3 Interpretation of transverse four (4) 66
4.3.4 Interpretation of transverse five (5) 68
4.3.5 Interpretation of transverse six (6) 68
4.3.6 Interpretation of transverse seven (7) 68
4.4 Correlation of borehole log 72
4.4.1 Transverse 1 72
4.4.2 Trasverse 2 72
4.4.3 Trasverse 3 72
4.4.4 Transverse 4 72
4.4.5 Transverse 5 72
4.4.6 Transverse 6 72
4.4.7 Transverse 7 73
4.5 Electrical borehole logging ` 82
4.5.1 About true resistivity of formation Rt and formation resistivityy factor F 83
4.5.2 Relation between CL and F 85
4.6 Depth to basement 90
4.7 Depth to water strick 90
4.8 Porosity 93
4.9 Permeability 94
CHAPTER FIVE
5.0 Summary 98
5.1 Conclusion 99
5.2 Recommendation 99
REFRENCES
LIST OF FIGURES
Fig 1.1: Location map of study area 4
Fig 2.1: Geological map of Nigeria (After Oyawoye 1972) 9
Fig 2.2: Pan African Framework, Cratons and the Precambrian Mobile belts 10
Fig 2.3: Schist belt localities within the context of the Geology of Nigeria 13
Fig 3.1: Drilling rods 26
Fig 3.2: Overburden guide 26
Fig 3.3: Casing 26
Fig 3.4: Hammer 26
Fig 3.5: Operator stand 26
Fig 3.6: Compressor 26
Fig 4.1:-The Borehole Log and the Geoelectric resistivity Section of Agala 32
Fig 4.2:-The Borehole Log and the Geoelectric resistivity Section of Academy 34
Fig 4.3:-The Borehole Log and the Geoelectric resistivity Section of Olodo 36
Fig 4.4:-The Borehole Log and the Geoelectric resistivity Section of Alakia. 37
Fig 4.5:-The Borehole Log and the Geoelectric resistivity Section of Eleyele. 39
Fig 4.6:-The Borehole Log and the Geoelectric resistivity Section of AS Estate. 40
Fig 4.7:-The Borehole Log and the Geoelectric resistivity Section of Olowomoore 42
Fig 4.8:-The Borehole Log and the Geoelectric resistivity Section of Elelu. 43
Fig 4.9:-The Borehole Log and the Geoelectric resistivity Section of Eboda. 45
Fig 4.10:-The Borehole Log and the Geoelectric resistivity Section of Afolabi Estate. 46
Fig 4.11:-The Borehole Log and the Geoelectric resistivity Section of Oluyole 48
Fig 4.12:-The Borehole Log and the Geoelectric resistivity Section of Ade-0wu 49
Fig 4.13:-The Borehole Log and the Geoelectric resistivity Section of mi-Adio. 51
Fig 4.14:-The Borehole Log and the Geoelectric resistivity Section of Banjo house 1. 52
Fig 4.15:-The Borehole Log and the Geoelectric resistivity Section of Banjo house 2. 54
Fig 4.16:-The Borehole Log and the Geoelectric resistivity Section of Challenge. 55
Fig 4.17:-The Borehole Log and the Geoelectric resistivity S ection of Oke-Odo. 57
Fig 4.20:-The Borehole Log and the Geoelectric resistivity Section of Mokola. 61
Fig 4.21:-The Borehole Log and the Geoelectric resistivity Section of Gbadebo 62
Fig 4.22:-The Borehole Log and the Geoelectric resistivity Section of Soka 63
Fig 4.21:-Correlation of Elewura Challenge, Seven-up Academy and Oke-Odo 65
fig 4.22:-Correlation of Alakia, Egbeda,Elelu and Ikumapayi Olodo 65
Fig 4.23:-Correlation of Agala, Mokola and As Estate and Olowomoore 67
Fig4.24:-Correlation of Jiboye,Oluyole, Banjo house 1 and Banjo house 2. 67
Fig 4.25:-Correlation of Geoelectric section of Afolabi Estate and Eleyele 69
Fig 4.26:-Correlation of Geoelectric section of Moniya and Akinyele 70
Fig 4.27:-Correlation of Geoelectric section of Eboda 71
Fig 4.28:-Correlation of Borehole Log of Challenge, Academy and Oke-Odo. 74
Fig 4.29: Correlation of borehole logs of Alakia, Egbeda, Elelu, Ikumapayi Olodo. 75
Fig 4.30: Correlation of borehole logs of Agala, Mokola, As Estate, Olowomoore. 76
Fig 4.31: Correlation of borehole logs of Omi-Adio, Oluyole, Banjo house 1 and 2. 77
Fig 4.32: Correlation of borehole logs of Afolabi Estate and Eleyele. 78
Fig 4.33: Correlation of borehole logs of Moniya, Akinyele 79
Fig 4.34: Borehole logs of Eboda. 80
Fig 4.35: Borehole logs of Soka and Gbadebo 81
Fig 4.35: 2D map showing the depth to water strick 92
Fig 4.37: The 2D Map showing the Porosity values 95
Fig 4.38: Permeability map 96
Fig 4.39: map of Ibadan showing the borehole log locations 97
Abstract
The properties of rocks varies from one geological location to another or even disappears laterally and this properties are important factors in the determination of groundwater quantity. This make this research work focused on the Correlative analysis of lithologies and borehole logs in the Basement terrain of Ibadan ,Southwestern Nigeria which falls between Longitude 3° 45̍ 00̎ - 4° 3̍ 00̎ to Latitude 7° 18̍ 36̎ – 7° 34̍ 12̎ using the Borehole logging and Geophysical Electrical Method.
A total of Twenty-two (22) Vertical Electrical Sounding Station and Borehole Log were acquired within the Study area with maximum schlumberger electrode separation of 100m. The data were presented as VES curves interpreted quantitatively by computer iteration using the WinResist Software to obtain the first order geoelectric model parameters. The results of the geoelectric investigation revealed some lithological Layer such as Clay, Laterite, topsoil, Weathered Basement, Fresh Basement.
The interpretation of the result shows that Water is struck between depth of 10m to 65m except at a Location where no water was encountered, the depth from the surface to basement within the study area ranges from 3m to 35m,the calculated Longitudinal Conductance (CL) ranges from 0.02 to 0.60, the Porosity Value is between 4.4% to 52.79%, Permeability Value ranges from 1.78 x 10-10 m/s to 2.6 x 10-3m/s and the Value of Formation Factor (F) ranges from 15.45 to 2786.89.
It can be concluded from the analyzed result that the Correlation between the Electrical Resistivity and Borehole Log shows a fair Correlation Strength and hence further logging techniques such as gamma ray, spontaneous potential should be employ to complement the work.
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