Groundwater exploration using 2D resistivity method in water supply for prevention of peatland fire at Kahayan Kuala area, Central Kalimantan

Abstract

Resistivity data acquisition using the two-dimensional (2D) resistivity method has been carried out at 8 locations in the Kahayan Kuala area, Pulang Pisau District, Central Kalimantan. The aim of the study was to identify the distribution type and depth of aquifer layers and other geological materials in subsurface based on their resistivity characteristics. The study results showed that resistivity values at the northern part of the study area ranging from 13.28–282 and 2.09–88.37 ohm-meter, while at the southern part, the resistivity values ranging from 0.32–25.75 ohm-meter. At the northern part of the study area, the resistivity values range of 41.77–88.37 to 67.7–187.79 ohm-meter are peat and mud layers, range of 25.35–88.37 to 55.29–282.28 ohm-meter are sandstone layers, and range of 2.09–34.31 to 13.28–67.78 ohm-meter were clay and sandy clay layers. At the southern part, the range of resistivity values from 5.97–25.75 ohm-meter are peat and mud layers, range of 4.46 - 25.75 ohm-meter are sandstone layers, and range of 0.32–5.97 ohm-meter are clay and sandy clay layers. Sandstone layers are interpreted as confined aquifers, peat and mud layers as unconfined aquifers, and clay and sandy clay layers as non-aquifer or sealing layers. At the northern part of the survey area, the depth of aquifer layers ranging from 10–40 meter and at the southern part the depth of aquifer layers ranging from 20–50 meter.