Analysis of Exploration Wells on Aquifer in Kaliwungu Formation and Regional Planning Recommendations

Abstract

Infrastructure development in the northern coast of Java continues to take place. The study and support of subsurface geological data and the value of hydrogeological parameters is one of the important parameters to support sustainable development. The existence of well exploration reportedly can support researchers for model validation and calibration. We carried out One-Dimensional and Two-Dimensional geoelectrical acquisition along with drilling in the Kaliwungu Formation which was lined with the Halang Formation. Ten points of one dimensional geoelectrical and two lines of geoelectrical acquisition VES method (Vertical Electrical Sounding), with a depth range of 100m Schlumberger and Wenner-Schlumberger configurations for profiling have reflected the study area dominated by aquitard (silty clay) with resistivity values < 20 ohm.m. The result of VES was then followed up by analysing the value of the well logging resistivity which was compared with the lithology of the cutting results in the 108m deep drill hole. Value of hydrogeological properties was carried out by the pumping test, were pumping test analysed using pumping cooper – Jacob single well software, and the result of hydraulic conductivity value was 6 x 10-9m/s, and the transmittivity value was 5.6 x 10-7 m2/s. Based on the Farvolden Method, the safe yield value was found to be comparable to the value according to Johson which is 3-8%.