Perubahan Karakteristik Kimia Fluida Reservoir Wayang Windu Bagian Utara Sebelum dan Setelah Produksi Tahun 2000
Wayang Windu Geothermal Field operated since 2000 is located at West Java. The production area of this field consists of northern (Puncak Besar and Gambung reservoirs) and southern (Wayang and Windu reservoirs) that interconnect. The reservoir has shallow vapor and deep brine reservoir.
The methodology of this study is to analyze change in fluid chemistry characteristics, hydrogeochemistry, recharge effects before and after production. Based on geochemical, reservoir fluid from WWA-2 well with 4.500 to 9.000 mg/kg of Cl contents; -0,74 to -1,3 of heavy stable isotope of δ18O dan 20 mmol/mol steam of CO2/H2S gas ratio. The fluid flow as outflow to northern (MBD-1 to MBB-6) and southern (WWF-1).
Before production, dilution process in MBD-1, MBE-2, WWQ-2, and WWQ-3 with 6.500 mg/kg of Cl and -3 of heavy stable isotope of δ18O. After production, WWQ-2 and 3 wells change to vapour phase. WWQ-5 well is undergone dilution process at before and after production. MBA-4, MBA-5 dan MBB-1 wells at northern are undergone dilution process showed by increase of H2S/NH3 gas ratio and decrease range of heavy stable isotope of δ18O at 2012. This condensation process inferred related to reversal temperature in MBB-6 well which has connected to other wells in that area..
Dilution process caused by recharge water from the west and northwest Bedil through East Boundary Fault and Bedil Horst. While, condensation process caused by recharge water was controlled by Bandung Basin Boundary Fault and Malabar Caldera.