应用气体地球化学测量勘查地热系统断裂构造的研究

化探方法是勘查地热系统的有效而重要的手段。地热储与构造的关系十分密切,查明各种控制地热水的构造,是热田勘查的重要环节。本文在总结了目前用于勘查地热系统构造的化探方法的同时,重点介绍了最近几年利用气体地化测量方法探测热田构造的成果,表明壤中Hg气、²¹⁰Po、静电α卡和现场累积CO₂气体测量方法等均是行之有效的手段。而且事实证明,在勘查地热系统构造方面,多参数综合指标较单一指标效果更好,结果更可靠。它不仅可反映已知断裂,还可揭示隐伏构造。

GAS GEOCHEMICAL EXPLORATION OF FAULTS IN THE GEOTHERMAL SYSTEM

Geochemical survey is an effective and important method in prospecting for geothermal systems. As geothermal reservoirs are closely related to structu res, it is essential for us to. investigate the structures contiolling the geothermal water in the process of geothermal field exploration.This paper summarizes the geochemical methods available for detecting faults in the geothermal system, with special attention paid to some testing results of gas geochemical survey performed in the last few years for faults in geothermal fields. It is shown that such methods as mercury vapor in soil, ²¹⁰Po, Alpha-card and in-situ goil-gas CO₂ accumulative determination are all effective mneas for detecting faults in the geotheraml area. Our study has also proved that the multi-parameter survey is much more effective and reliable than the single-parameter survey. The geochemical survey can be used not only to find faults but also to disclose concealed structures in the geothermal system.