Treatment of Some Problems in Numerical Modeling of Geothermal Water System in Deep-Seated Basement Rocks near Tianjin
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摘要: 天津市基岩地下热水具有密度随温度变化显著、存在水岩之间热交换的特点, 采用适合于描述深层地下热水水流和热量运移的压力场和温度场控制方程, 通过对渗流场、边界条件的合理概化和对初始条件、热储层缺失区域及倾斜断层等的合理处理, 使所建立的三维数值模型变得更为有效和实用.Abstract: Geothermal waterin the basement aquifers near Tianjin is characterized by a significant change in density of the water with its temperature and an exchange of heat between the water and its surrounding rocks. This paper puts forward the governing equations of pressure and temperature for describing water flow and heat transport of the deep-seated geothermal system. The 3-dimensional numerical model established are proved more effective and practical by the reasonable generalization and treatment of the flow domain, boundary and initial conditions, missing areas of the aquifers, and tilted faults.
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Key words:
- geothermal water /
- 3 dimensional model /
- numerical modeling /
- density /
- pressure /
- temperature
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图 1 研究区基岩地质分布
F1.沧东断裂; F2.天津断裂; F3.白塘口西断裂; F4.海河断裂; F5.潘庄断裂; F6.宝坻-宁河断裂; F7.胡连庄断裂; Mz.中生界; Q—N.第四—第三系; C—P.石炭—二叠系; O.奥陶系; .寒武系; Pt.中新元古界.点线为模型边界
Fig. 1. Geological map of basement rocks in the study area
图 2 计算区边界条件和平面剖分
1.给定压力和温度边界; 2.隔水、隔热边界
Fig. 2. Boundary conditions and discretization in a horizontal plane of modeled domain
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