青海省西宁地热田成因分析及资源评价
Genetic analysis and resource evaluation of the Xining geothermal field in Qinghai Province
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摘要: 提要：笔者通过对西宁地热田已有钻探资料和区域地热地质资料，结合近几年的勘查项目研究成果，分析了西宁地热田的埋藏条件、补径排条件、地温场及水文地球化学的特征，阐述了西宁地热田主要以大地热流为热源—低热导率岩层聚热—深循环逐渐加热受迫对流机制—构成控水控热，具有以盆地传导型面状热储为主，兼有断裂对流型带状热储特征。同时，采用热储法对西宁地热田地热资源量进行了评价，该地热田内热储中储存的热量9.343×1014 kJ，利用平均布井法计算出该地热田每年开采热量为1.12×1012 kJ，折合标准煤3.78×104 t，按地热田规模分级为中型低温地热田。初步摸清了西宁地热田分布规律以及资源量，为西宁地热田地热资源合理开发利用提供了重要依据。Abstract: Abstract: Based on available drilling data of the Xining geothermal field and regional geothermal and geological data in combination with research results of recent exploration projects, the authors analyzed burial conditions, recharge and runoff discharge conditions, geo-temperature field and geochemical characteristics of the Xining geothermal field, and pointed out that the Xining geothermal field mainly has terrestrial heat flow as the heat source, the strata with low thermal conductivity accumulate the heat, the deep circulation gradual heating forced convection mechanism causes the water control and heat control, dominated by basin conduction type planar thermal reservoir, with some characteristics of fracture convective banded thermal reservoir. The thermal reservoir method was adopted to conduct evaluation of the geothermal resource quantity of the Xining geothermal field. The heat quantity accumulated in the thermal reservoir of the geothermal field is 9.343×1014 kJ，and the annual exploited heat quantity of the geothermal field calculated by the average well deployment method is 1.12×1012 kJ, equivalent to 3.78×104 t standard coal. According to the scale classification, the Xining geothermal field should belong to the medium type low-temperature geothermal field. The distribution regularity and resource quantity of the Xining geothermal field have been ascertained, which provides an important basis for the rational development and utilization of geothermal resources in the Xining geothermal field.
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Keywords:
- Xining geothermal field /
- genetic analysis /
- resource evaluation
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