KARAKTERISASI SISTEM MULTI AKIFER DAN IDENTIFIKASI SISTEM ALIRAN PANAS SUMUR HIPERTHERMAL DAERAH PEKANBARU DAN SEKITARNYA PROPINSI RIAU

• Main Author: Moriza, Gengky
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/3038
• Institution: Institut Teknologi Bandung

The geometry and configuration of the aquifer in studies area show : 1 unconfined aquifer of 3 - 30 m thickness, 1 -3 semi confined aquifers of 5 - 25 m thickness, and 3 - 6 aquicludes of 4 - 30 m thickness. The first multy confined aquifer consists of two layers of 10 - 50 m thickness. There are 5 pumping tests to those aquifers give transmissivity (T) about 2.514 x10-4 m2/second and conductivity (k) about 9.15 x 10-6 rn/second. The second multy confined aquifers consists of 2 -3 layers of 25 - 70 meter thickness. There are 2 pumping tests to those aquifers give transmissivity (T) about 4.12 x 10-4 m2lsecond and conductivity (k) 9.15 x 10-6 misecond. <br /> The recharge area boundary of the aquifer system in the Northern part is indicated by a local boundary, while the South western part is by regional boundary. The zero internal flow line is the basement of the aquifer system, while the zero external line is the fault zone, which the Siak river (discharge area) shows the highest head. <br /> The North-South hydrogeologic cross section based on the analysis of those eight groundwater deep wells, shows 4 (four) multy aquifers, e.i unconfined aquifer has a water temperature 23 - 27°C, is classified as hypothermal; semi confined aquifer has a water temperature 27 - 30°C, is classified mesothermal; confined aquifer system consist of two groups : 1 group has a water temperature 43 - 45°C is classified as hyperthermal, while the 2 group has a water temperatur 35 - 37°C is also classified as hyperthermal. The ground water deep wells exploiting the second group of the aquifer system is located nearer the recharge area, so the water temperature is lower than the first group. <br /> Based on the temperature data of the oil well, graph showing the relationship between the depth and temperature, indicated a similarity, with the value of gradient geothermic is about 5.9°C/100 meter. It is a group showing the temperature data plotted againts the depth of the screen of the well. These data plot based on the assumption that the water temperature is the temperature of the groundwater deep in site, because the decreasing of the temperature while going up to the surface is relatively small. Using that asumption, the original sources of the hot groundwater flow of the SBR-5 is located at 330 meter depth and the SBP-16 at 340 meter depth respectively. Those evidences indicated that the increasing of heat is caused by the gradient geothermal and the fault zone do as a media of the heat