Resistivity survey has been carried out at Bestari Jaya (formerly known as Batang Berjuntai). Aim to detect the underground old river channel location. The survey was done using ABEM SAS4000 resistivity meter and ABEM LUND ES10-64 electrode selector system.

Sub-surface analysis using resistivity survey has been carried out  to guide client with location of potential cavity or depression area based on resistivity value. The survey was done using ABEM SAS4000 resistivity meter and ABEM LUND ES10-64 electrode selector system.

Resistivity survey has been carried out at residence area in Bukit Jelutong. Aim to detect the underground pipe leakage and estimate the size/volume affected area. The survey was done using ABEM SAS4000 resistivity meter and ABEM LUND ES10-64 electrode selector system.

To locate groundwater accurately and to determine the depth, quantity, and quality of the water, several techniques must be used, and a target area must be thoroughly tested and studied to identify hydrologic and geologic features important to the planning and management of the resource. Resistivity technique can be used in mapping the groundwater in term of depth, length, and the cross-section of the aquifer.

Resistivity survey also can be used in determine the bedrock depth. For the hilly site in Malaysia, basically the depth of the bedrock will not greater than 100m. Resistivity survey is the alternative for seismic refraction or seismic reflection method in determine the depth of bedrock.

Resistivity survey is one of non-destructive method. Resistivity survey suitable for groundwater / aquifer detection. This geophysical method could be made near housing area without damaging personal property.  

Resistivity survey could be used to determine the depth of bedrock and mapped along the survey profile. The depth of penetration depends on the array / protocol used. For the depth of bedrock more than 70 m, pole-dipole array/protocol is the best option.

2D Electrical Resistivity Imaging 

Resistivity imaging (also known as electrical resistivity imaging (ERI) or resistivity tomography (ERT) is one of the versatile geophysical method. Resistivity imaging measure the resistivity properties of the sub-surface by assessing the potential drops between electrodes in a variety of configurations, depends on the type of geophysical survey data required. Electrical resistivity surveys can be completed using multi-electrode consist of 41 electrode for 200 m cable and 61 electrode for 400 m cable. Therefore, an ERI survey line could extend up to 400m.

Low Cost of Survey/Exploration

Electrical resistivity imaging is one of the cost effective geophysical method. If compared to seismic refraction, GPR and other methods.

Versatile Geophysical Method

This method can be applied in most environment and engineering needs. Hilly area, open area, housing area, on concrete floor, tunnel, and etc. The list below is the example of capabilities of geophysical technique in solving environmental problems. Electrical resistivity imaging with IP (Induced Polarization which is part of resistivity method) could solve all the problems listed below.

List of environmental problems and methods that can be applied to solve the problem

Fast Data Processing

By using powerful inversion software, electrical resistivity data could be process as fast as possible after data acquisition at field. If compared to gravity, magnetic, seismic refraction and seismic reflection  methods, ERI is more time consuming. 

Interactive Result Display

Our clients satisfaction and understanding are our priority. Therefore, we try our best to give interactive result with professional explanation and interpretation.

An example of 2D Resistivity Imaging Result

The purpose of geoelectrical surveys is to determine the subsurface resistivity distribution by making measurements on the ground surface. From these measurements, the true resistivity of the subsurface can be estimated. The ground resistivity is related to various geological parameters such as the mineral and fluid content, porosity and degree of water saturation in the rock. Electrical resistivity surveys have been used for many decades in hydrogeological, mining, geotechnical, environmental and even hydrocarbon exploration (Loke et al. 2011).

The Resistivity Value of Earth Materials

Basically, igneous and metamorphic rocks typically have high resistivity values. Sedimentary rocks, which are usually more porous and have higher water content, normally have lower resistivity values compared to igneous and metamorphic rocks.The resistivity of groundwater varies from 10 to 100 ohm.m. Seawater has a low resistivity values which is 0.2 ohm.m.

after Loke 2013.

Reference: Loke, M.H. 2013. Tutorial : 2-D and 3-D electrical imaging surveys