青海共和盆地新近系热储层地热资源量评价与分析

Geothermal energy assessment and analysis in Neogene geothermal reservoir of Gonghe Basin,Qinghai

提出一套热储温度主控因素分析、热储温度预测方程构建和考虑单井涌水量的地热资源量评价方法体系。应用于中国共和恰卜恰地热田,结果显示该地热田新近系热储温度呈现西高东低的趋势,热储层最高温度超过160℃;利用克里格插值方法,确定热储层50 m降深对应的单井涌水量最高为3600 m^(3)/d。综合热储层温度和涌水量空间分布特征,确定了恰卜恰新近系热储层供热能力并圈定水热资源开发优势靶区,靶区内每10000 m^(2)热储层的供热能力评价可以达到18 MW。

A novel methodology for the assessment of geothermal energy at regional scale was proposed in this study,combining regression analysis,regression equation establishment for temperature prediction,and heat production potential assessment regarding the groundwater yield in the reservoir.The implementation of the methodology in the Qiabuqia geothermal field resulted in that in the Neogene geothermal reservoir of the geothermal field of interest,the temperature is high in the west,and decreases towards east.The highest temperature reached to 160℃.Maximum groundwater yield of the reservoir was estimated at 3600 m^(3)/d,corresponding to a stabilized drawdown of 50 m.Considering both spatial distribution of temperature and groundwater yield,the heat production potential was estimated and the target area for large-scale geothermal exploration in the Qiabuqia geothermal field was determined,with an average heat production rate of 18 MW per 10000 m^(2) reservoir.