Integration of High Resolution Geoelectrical Resistivity and Refraction Seismic Profiling for Exploration of Groundwater

This paper presents the integration of high resolution geoelectrical resistivity and seismic refraction profiling for exploration of groundwater: case history from Chemor, Perak, Malaysia. The survey line is conducted at the intersection of two major faults where it is suspected to detect potential aquifers in limestone hardrock along the major fractures. Seismic refraction survey is used to determine the velocity of energy transmitted through the rock. Geoelectrical resistivity survey involved the use of new electrodes arrangement and sequence of measurements for Wenner-Schlumberger array and Dipole-Dipole array for geophysical field data acquisition in order to increase its data density and sensitivity to obtain high resolution 2-D subsurface imaging. The parameters that were taken into consideration while choosing the two most suitable arrays to be used were their sensitivity to vertical boundary, signal strength and total number of datum points. Data Levels Synthesization (DLS) technique also developed which involved the merging of data levels and datum points of Dipole-Dipole array and Wenner-Schlumberger array during resistivity data processing stage. DLS technique has effectively produced a high resolution 2-D geoelectrical resistivity image with enhanced horizontal and vertical resolution.