开封凹陷区深层地热资源地质条件分析

地热资源开发利用可以调整能源结构，减少对常规能源的消耗。分析了开封凹陷区深层地热资源地质条件，对热储层埋藏条件及划分进行了研究，得出主要有新生界新近系松散岩类孔隙热储层和古近系热储层，新近系热储厚度大，自上而下分为明化镇组和馆陶组2个热储层。分析了研究区地球物理特征，得出研究区地热异常区域主要分布在开封市至陈留镇一带，地热异常高区域在研究区西北部；研究了地温场特征，得出区内恒温带深度为23 m，恒温带温度为160 ℃。开封市区的地温梯度范围为32～39 ℃/hm，平均35 ℃/hm，大于35 ℃/hm的范围为条带状，呈近南北向展布；东西向地温梯度偏低，在33～35 ℃/hm，平均34 ℃/hm，大于35 ℃/hm的范围较小。地热资源的开发利用保障了能源安全、促进节能减排目标的实现，改善生态环境质量，发展产业经济。

Analysis on geological conditions of deep geothermal resources in Kaifeng Depression

The development and utilization of geothermal resources can adjust the energy structure and reduce the consumption of conventional energy.This paper analyzes the geological conditions of deep geothermal resources in Kaifeng sag,studies the burial conditions and classification of thermal reservoirs,and concludes that there are mainly Cenozoic Neogene loose rock pore thermal reservoirs and Paleogene thermal reservoirs.The Neogene thermal reservoirs are thick and can be divided into Minghuazhen Formation and Guantao Formation from top to bottom.By analyzing the geophysical characteristics of the study area，it is concluded that the geothermal anomalous areas in the study area are mainly distributed in the area from Kaifeng City to Chenliu Town and the high geothermal anomaly area is in the northwest of the study area.The characteristics of ground temperature field are studied,and it is concluded that the depth of the constant temperature zone is 23 m,and the temperature of the constant temperature zone is 16.0 ℃.The range of ground temperature gradient in Kaifeng urban area is 3.2~3.9 ℃/hm,with an average of 3.5 ℃/hm,and the range of more than 3.5 ℃/hm is strip shaped,distributed in nearly north-south direction.The eastwest geothermal gradient is relatively low,ranging from 3.3 ℃/hm to 3.5 ℃/hm,with an average of 3.4 ℃/hm,and the range of more than 3.5 ℃/hm is small.The development and utilization of geothermal resources ensure energy security,promote the realization of energy conservation and emission reduction goals,improve the quality of the ecological environment,and develop the industrial economy.