An unsaturated three-dimensional model of fluid flow and heat transfer in NW Sabalan geothermal reservoir

Mirmahdi Seyedrahimi-Niaraq, Faramarz Doulati Ardejani, Younes Noorollahi, Saeid Jalili Nasrabadi, Amin Hekmatnejad

研究成果: Contribution to journalArticle査読

3 被引用数 (Scopus)

抄録

This paper presents a 3D numerical model for the north-west (NW) Sabalan geothermal system, including the unsaturated vadose zone overlying the system, based on a conceptual model derived from data gathered from 10 deep exploration wells. To achieve the goal, the EOS3 (water-air state equation) module of the Tough2 simulator was utilized to develop the model. The model was constructed from a rectangular prism, which is 11.5 km long, 8 km wide, and variable depths ranging from 3.8–5.11 km. The 21 horizontal layers with a thickness range of 100−1000 m were expanded from the maximum height of 4110 to -1000 masl. A total of 22 rock types were distributed within the model based on the availability of rock units and geological structures derived from the exploration wells. The permeability of these rock types varied from 1.0 × 10−17 to 9.0 × 10-13 m2. The model was initially run to match the natural state of the reservoir. A close agreement was obtained between the measured data from the exploration wells, and the model results for subsurface temperatures and pressures. In the calibrated model, a high temperature upflow zone was required in the southeast part of the area (below the exploration sites D and E). This flow rises to the land surface through permeable zones, faults, and fractures, and finally appears on the earth's surface as hot springs in the northwestern part of the area. This model was then used as the initial model to predict the reservoir performance for the 50 MWe scenario. The results showed that the reservoir can generate about 45 MWe by assigning two makeup wells and remain at this level for more than 30 years.

本文言語英語
論文番号101966
ジャーナルGeothermics
89
DOI
出版ステータス出版済み - 1 2021

All Science Journal Classification (ASJC) codes

  • 再生可能エネルギー、持続可能性、環境
  • 地盤工学および土木地質学
  • 地質学

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