Reactive geothermal transport simulation to study the formation mechanism of impermeable barrier between acidic and neutral fluid zones in the Onikobe Geothermal Field, Japan

Todaka, Norifumi ; Akasaka, Chitosi ; Xu, Tianfu ; Pruess, Karsten

Lawrence Berkeley National Laboratory

关键词: Reactive Transport Geothermal Simulation Formation Mechanism Impermeable Barrier Onikobe Geothermal Field;    15 Geothermal Energy;    Upwelling Geothermal Legacy;    Geothermal Legacy;    Simulation;   

DOI  :  10.2172/813581
RP-ID  :  LBNL--52493
RP-ID  :  AC03-76SF00098
RP-ID  :  813581

美国|英语

来源: UNT Digital Library

【 摘 要 】

Two types of fluids are encountered in the Onikobe geothermal reservoir, one is neutral and the other is acidic (pH=3). It is hypothesized that acidic fluid might be upwelling along a fault zone and that an impermeable barrier might be present between the acidic and neutral fluid zones. We carried out reactive geothermal transport simulations using TOUGHREACT (Xu and Pruess, 1998 and 2001) to test such a conceptual model. Mn-rich smectite precipitated near the mixing front and is likely to form an impermeable barrier between regions with acidic and neutral fluids.