河南新商断裂对地热资源形成的控制作用及资源潜力分析

Control of Xinshang Fault on geothermal resources in Henan Province and its resource potential

新商断裂是一条几乎横贯河南的区域性深大断裂,构成了济源-开封凹陷和通许凸起两大地热单元的边界。在其及影响带附近分布着新乡-延津、兰考、民权、宁陵-商丘等大型地热田,蕴藏着丰富的中深层地热资源。该文通过分析新商断裂的构造特征和地热流体特征,系统分析了深大断裂对地热资源的控制作用,以商丘项目为例分析了其资源潜力。区内地下热水的分布特征严格受控于新商断裂的展布方向,地下热水的温度取决于盖层的厚度及围岩的放射性含量,地热资源潜力巨大,地热可采资源量约140.37×10^4 m^3/a,地热流体含热能量71.94×10^12 J/a,折合标准煤2454.6 t/a,可减少CO2排放5856.8 t/a,该研究为今后在该地区开展地热资源勘查工作具有一定的指示意义。

The Xinshang Fault is a regional deep and large fault almost across Henan Province,which forms the boundary of two geothermal units in Jiyuan-Kaifeng depression and Tongxu uplift. Xinxiang-Yanjin,Lankao,Minquan,Ningling-Shangqiu and other large geothermal fields are distributed near the zone and its influence zone,which contain rich middle-deep geothermal resources. By analyzing the structural characteristics and geothermal fluid characteristics of Xinshang Fault,this paper systematically analyzes the controlling effect of deep and large faults on geothermal resources,and takes Shangqiu project as an example to analyze its resource potential. The distribution characteristics of underground hot water in the area are strictly controlled by the distribution direction of Xinshang Fault,and the temperature of underground hot water depends on the thickness of cap layer and the radioactive content of surrounding rock,so there is great potential for geothermal resources. Geothermal recoverable resource is about 140. 37×104 m3/a,and thermal energy is about 71. 94×1012 J/a,equivalent to about 2454. 6 t/a of standard coal,and can reduce CO2 emission by 5856. 8 t/a. This study has certain indicating significance for geothermal resources exploration in this area in the future.