拉脊山北缘断裂带地热水化学特征及成因模式
Geothermal hydrochemical characteristics and genesis patterns of the fracture zone along the northern margin of the Laji Mountains
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摘要: 拉脊山北缘断裂带上出露有大量低温资源，水温25℃以下。针对区内已施工过的不同深度地热勘查孔进行调查，均以有水无热或有热无水等告终。为全面认识并填补该地区地热资源成因机制，对地热资源的未来开发与利用提供指导，本文选取拉脊山北缘断裂带典型地热系统作为研究对象。通过深入分析9组地热水化学特征和氢氧同位素组成差异，探讨断裂带温泉水热活动成因机制。研究结果揭示，该地区地热水的化学类型主要呈现为HCO3-Ca•Mg、HCO3•SO4-Na•Ca型水和Cl-Na型；地热水赋存于相对还原的环境之中，其封闭性较为良好；地热水的补给源主要为南部基岩山区的大气降水，补给高程介于2515～4345m；深部热储温度范围在38.3~82.5℃；热储循环深度介于746~2490m；冷水混入比例在59%~81%之间。地区地热成因可分为断裂深循环型与断陷盆地型地热系统两类。此研究成果为地热资源的合理开发与利用提供了一定数据支撑。
Abstract: A large amount of low-temperature resources are exposed on the fracture zone at the northern edge of the Laji Mountain, with the water temperature below 25℃. Investigations of geothermal exploration holes of different depths that have been constructed in the area have ended in water without heat or heat without water, etc. The purpose of this paper is to fill the knowledge gap on the genetic makeup of geothermal resources in the region and to provide guidance on the future growth and use of these resources, this paper selects a typical geothermal system along the northern margin of the Lajishan fault zone as the research subject. Through in-depth analysis of the chemical characteristics and differences in the composition of hydrogen and oxygen isotopes of the geothermal waters of the nine groups, the genesis mechanism of the hydrothermal activity of the hot springs in the fracture zone was explored. The chemical types of geothermal water in this area are mainly characterized by HCO3-Ca•Mg, HCO3•SO4-Na•Ca, Cl-Na type, Stored in relatively reducing environments with good closure, geothermal water is primarily recharged by atmospheric precipitation from the southern bedrock mountainous areas, with recharge altitudes ranging from 2515 to 4345 meters. The temperature range of the deep heat reservoir is between 38.3 and 82.5°C, and the circulation depth of the heat reservoir is between 746 and 2490 meters, with a mixing ratio of cold water ranging from 59% to 81%. The geothermal genesis in the area is thus established.. The geothermal genesis in the area can be divided into two types: deep circulation fault type and faulted basin type geothermal systems. This research provides certain data support for the rational development and utilization of geothermal resources.. -
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