Dear Okechukwu,
You may want to check this one: Musset, A.E. & Khan, M. A.: Looking into the Earth, An introduction to geological geophysics, CUP, Page 183
BTW, I have the feeling that your model is overfitted. Have you checked the errors of your resistivity parameters? It is very strange to see a relatively thin, relatively low resistivity layer (layer 4) between two high resistivity ones. (Have you corrected for changing the MN electrode distance?) I guess the resistivity of layer 5 is fixed. What is the reason to set such a high value?
Kind regards, Balázs
https://books.google.at/books?id=nzJLiPjHvCQC&printsec=frontcover&hl=de#v=onepage&q&f=false
Dear Okechukwu
you can use the attached files to get an idea about what you seeking. however, regarding to your interpretation, i think that there are mistaking in your interpretation. i saw very high resistivities with this depth. i do not know the lithology of your study area but your investigation depth is very small compared with the high variation in resistivity. you should make reinterpretation to your curve manually using Ebert method and compare the results of this method with the previous results.
I agree with Mohammed, your results are showing very unusual values which is not expected in nature. Check the values once and then follow mohammed. Further You can see book by W.Lowrie http://elibrary.bsu.az/azad/new/2194.pdf
Dear Okechukwu,
First, the electrical resistance (resistivity) values of the rocks , contain varying values are not absolute values , ie it is possible that the value of resistivity express certain sedimentary rock and the same value reflects the other rock in another area.
second, u can read this book Direct Current Geoelectric Sounding Hardcover – 1976
third, I think as mohammed and shib mentioned before there is something up-normal due to your model results (res and th.)
fourth, u can contact with me to make a new model
Please observe this table by P.V. Sharma 1986, of rock resistivity ranges. And its range values because there is no absolute resistivity value for a certain lithology due to the complex factors that effects on, like wet and dryness, electrolytic conductance , clay content , effective porosity or hydraulic conductivity , electronic conductivity of sulfides or metalic minerals content and salinity of rock brine.......etc.
Hope this will help.
Regards
Dr . Wadhah M. Shakir
I agree with the comments. The resistivity ranges are very unusual. I have read several books and papers, the best one which can really help you is a book entitled "Geophysics For Mineral Exploration Geoscientists". This book is totally fantastic, don't miss it.
I advice you to read the basic concepts of resistivity (in this book) which gives you really important insights. There is also a good graph of resistivity in different materials, rocks, etc.
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