世界核地质科学2025，Vol.42Issue(3)：607-617,11.DOI:10.3969/j.issn.1672-0636.2025.03.011
高温地热储层中CO2含量的确定
Determination of CO2 content in high-temperature geothermal reservoirs:A combined method of temperature-flow pressure well testing and two-phase flow simulation
摘要
Abstract
CO2 is the main component of non-condensable gas in high-temperature geothermal fluid and its existence still have important impact on geothermal development.Determining its content in high-temperature geothermal fluid is of great significance for geothermal development.The conventional sampling and testing analysis of CO2 content determination has some drawbacks,such as insufficient sampling representativeness,cumbersome implementation process and high sampling cost.Based on the pressure-temperature measurement in the wellbore during discharge tests and two-phase flow calculation,this paper proposed a new method to determine CO2 content in the geothermal reservoirs.This method only uses a large number of relatively reliable measured data of temperature and pressure,it has low cost,strong practicability and good reliability.This paper first describes the pressure-temperature measurement during discharge tests.Then constructs a model that solves the two-phase flow in the geothermal wellbore,which was verified by comparison with the commercial software WELLSIM,and determine CO2 content by using both the wellbore pressure-temperature measurement and model calculation data.Finally,the method was tested and verified by using the measured data from Gulu geothermal field in Tibet and the Ziledaer geothermal field in Turkey,and the CO2 contents in the geothermal reservoir were determined to be 1.1%and 3.2%respectively.关键词
地热/CO2/温度和压力测试/井筒/非等温两相流动Key words
geothermal/carbon dioxide/pressure-temperature measurement/wellbore/two-phase flow分类
天文与地球科学引用本文复制引用
刘军,雷宏武,孙国强,谢迎春,白冰..高温地热储层中CO2含量的确定[J].世界核地质科学,2025,42(3):607-617,11.基金项目
国家自然科学基金项目(No.U2344226和No.42472364) （No.U2344226和No.42472364）
中国核工业集团有限公司集中研发项目"地热勘查开发利用关键技术研究"联合资助 Supported by the National Natural Science Foundation of China[grant number U2344226 and 42472364]and the CNNC's centralized R&D project"Research on Key Technologies of geothermal exploration,development and utilization" （）
