Identification of subsurface layer with Wenner-Schlumberger arrays configuration geoelectrical method

Global Colloquium on GeoSciences and Engineering 2017

Jamaluddin^1 ; Umar, Emi Prasetyawati^2

Geological Engineering Department, School of Geosciences, China University of Petroleum, Qingdao, China^1

Mining Engineering Department, Faculty of Industrial Technology, Universitas Muslim Indonesia, Makassar, Indonesia^2

关键词: Coastal precipitation;    Geoelectric methods;    Geoelectrical methods;    Material resistivity;    Measurement methods;    Processing on software;    Resistivity values;    Wenner schlumberger;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/118/1/012006/pdf
DOI  :  10.1088/1755-1315/118/1/012006

来源: IOP

【 摘 要 】

One of measurement methods to investigate the condition of the subsurface is by using geoelectric method. This research uses wenner-Schlumberger arrays configuration geoelectrical method which is mapping resistivity that is commonly known as profiling (2D) in order to identify the lateral and vertical anomaly of material resistivity. 2D resistivity cross section is obtained from the result of data- processing on software Res2Dinv. The data were obtained along 70 m using Wenner-Schlumberger configuration with 5 m spaced electrode. The approximated value of resistivity obtained from the data processing ranged from 1000-1548 Ωm and with the iteration error 87.9%. Based on the geological map of Ujung Pandang sheet, the location of the research is an alluvium and coastal precipitation area with grain in forms of gravel, sand, clay, mud, and coral limestone. Thus, by observing and analyzing the variety of the resistivity cross-section from the inversion data, there are areas (a) showing resistivity values ranged from 0.1-0.2 Ωm which is estimated to be salt water intrusion based on the resistivity table of Earth materials, and region (b) which is a mixture of sand and clay material with the range of resistivity values between 1-1000 μm.