延津县下新近系热储层回灌水运移规律数值模拟研究

河南省东部新生界沉积盆地新近系—古近系形成巨厚的砂岩、泥岩孔隙、裂隙型热储层，是目前河南省地热开采的主要目的层。采用Tough2数值模拟软件，研究了不同回灌率下温度场变化、抽水井出水温度降幅与抽回灌井间距关系，氯离子运移距离与回灌率关系以及热储背景压力水头降幅与不同回灌率工况关系。研究可为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，从而促进地热资源的可持续开发。

Numerical simulation study on migration law of recharged water in lower Neogene thermal reservoir in Yanjin County

The Neogene-Paleogene in the Cenozoic sedimentary basin in eastern Henan Province has formed huge thick sandstone，mudstone pores and fractured thermal reservoirs，which are the main target layers for geothermal exploitation in our province at present.Using Tough2 numerical simulation software，the temperature field changes under different reinjection rates，the relationship between the water temperature drop of pumping wells and the distance between pumping and reinjection wells，the relationship between the chloride ion migration distance and the reinjection rate，and the relationship between the water head drop of thermal storage background pressure and different reinjection rates were studied.The research provides a demonstration for geothermal well extraction and irrigation，provides a basis for the development，protection and effective management of geothermal resources，and promotes the sustainable development of geothermal resources.