井温测井数据在湖北中深层地热勘查中的多效应用

Various Application of Well Temperature Logging Data in Middle-deep Geothermal Exploration in Hubei Province

井温测井作为常规物探手段,广泛应用于多数地热勘查项目。基于大量测井生产实践经验,以湖北省两处中深层地热井为例,总结在不同监测模式和监测环境下,应用井温测井数据解决地温梯度读取、高温层及涌水层识别、套管查漏、裂隙观测等实际生产问题的方法。利用静态井温监测数据和地温梯度变化曲线,可有效识别高温层,并准确采集地温梯度数据。利用动态井温监测数据和井温梯度变化曲线,可在复杂环境下有效识别涌水层,并定性判断涌水量大小。利用动态井温监测曲线的微小异常,可有效识别套管破损等固井情况。在地热勘查中充分灵活地应用井温测井数据能有效提高勘查工作效率并降低工作成本。

Well temperature logging is widely used in most geothermal exploration projects as a conventional geophysical exploration method.Based on a large number of logging production practice experience, taking two middle-deep geothermal wells in Hubei Province as an example, this paper summarizes the application of well temperature logging data in different monitoring modes and monitoring environments to solve practical production problems such as geothermal gradient reading, high temperature and water gushing layer identification, casing leak detection and fracture observation.Using static well temperature monitoring data and geothermal gradient change curve, high temperature layers can be effectively identified, and geothermal gradient can be accurately collected.Using dynamic well temperature monitoring data and well temperature gradient curve, the water inflow layer can be effectively identified in complex environment, and the amount of water inflow can be qualitatively determined.Using the small anomaly of the dynamic well temperature monitoring curve, the cementing conditions such as casing damage can be effectively identified.The full and flexible application of well temperature logging in geothermal exploration can effectively improve the efficiency of exploration work and reduce the cost of work.