延津县下新近系热储层对井采灌试验研究

为了给地热对井采灌提供示范，为地热资源开发、保护和有效管理提供依据，促进地热资源的可持续开发，研究了延津县下新近系热储层对井采灌试验。研究得出，研究区地温梯度为3.0～3.5℃/hm,延津县城一带由于新乡—商丘断裂的导热作用，地温梯度高于3.5℃/hm,热储水化学类型为Cl-Na型。热储层中存在裂隙或破碎带(高渗通道),热储层的连通构造曲折复杂，但热储层中裂隙不发育；通过分析地热流体的单井回灌试验和生产性对井采灌试验监测数据，总结地热回灌工艺流程及回灌量衰减规律，分析其原因并提出对策。研究可为河南省地热实现对井回灌—开采提供示范和指导。

Experimental study on well production and irrigation in lower Neogene thermal reservoir in Yanjin County

In order to provide a demonstration of geothermal well extraction and irrigation，provide a basis for the development，protection and effective management of geothermal resources，and promote the sustainable development of geothermal resources，this paper studies the well extraction and irrigation test of the lower Neogene thermal reservoir in Yanjin County.The study shows that the geothermal gradient in the study area is generally from 3.0 to 3.5 ℃/hm，while in Yanjin County，the geothermal gradient is higher than 3.5 ℃/hm due to the thermal conductivity of the Xinxiang-Shangqiu fault.The chemical type of thermal water storage is Cl-Na type.There are fissures or broken zones （high permeability channels） in the thermal reservoir，and the connected structure of the thermal reservoir is tortuous and complex，but the fissures are not developed in the thermal reservoir.By analyzing the monitoring data of single well reinjection test and productive well extraction and injection test of geothermal fluid，this paper summarizes the process flow of geothermal reinjection and the attenuation law of reinjection amount，analyzes the reasons and proposes countermeasures.The research can provide demonstration and guidance for the realization of well recharge-exploitation in our province.