Analysis of Thermal Storage Characteristics of the Guide Zhacang Geothermal Field in Gonghe Basin Based on Logging Data
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摘要: 青海共和盆地东部的贵德次盆扎仓地区发育复合型高温地热资源, 先后施工完成的ZR1井3000 m裂隙型热储测温151.34 ℃, ZR2井4600 m干热岩热储测温214 ℃, 展现共和盆地良好的地热资源潜力。本文首次报道ZR2井全井常规与特殊测井数据, 评价了扎仓沟花岗岩热储的孔隙度、体积密度、岩石生热率、岩石力学、地应力等关键参数, 结果显示: ZR2井温测井显示4 092.8 m温度达到180 ℃, 4602 m深度井温214 ℃; 利用电成像测井识别出两段裂缝集中发育带, 分别为4210—4220 m和4310—4320 m, 并对全孔段裂缝的产状进行了统计分析; 利用井壁崩落和三井径法, 计算该钻孔现今最大主应力方向为近南北向; 共解释岩性破碎地层(疑似含水)21.4 m/2层, 岩性较完整地层70.4 m/7层, 岩性完整地层376.1 m/27层, 高放射性地层7.6 m/2层。热储测井解释结果为系统评价热储和开发利用提供参考。Abstract: This study investigated the development of compound high temperature geothermal resources in Zhacang Area, China. Temperature measurement of 3000 m fractured thermal storage in Well ZR1 is 151.34 ℃, and temperature measurement of 4600 m dry hot rock reservoir in Well ZR2 is 214 ℃, showing serviceable geothermal resources potential in Gonghe Basin. Our approach was intented to elucidate potentially serviceable geothermal resources in the Gonghe Basin. Key parameters such as porosity, bulk density, rock heat generation rate, rock mechanics, and ground stress of Zhacanggou granite thermal storage were evaluated. Our results showed that the temperature logging of 4092.8 m was at 180 ℃ and that of 4602 m was at 214 ℃ in Well ZR2.The electrical imaging logging was used to identify two fracture concentrated development zones, which were 4210-4220 m and 4310-4320 m. The occurrence of cracks throughout this section was analyzed statistically.Additionally, using borehole wall caving and the three-bore method, the maximum principal stress direction of the borehole was calculated to be nearly north-south. A total of 21.4 m for 2 lithologic fractured strata (suspected water cut), 70.4 m for 7 lithologic complete strata, 376.1 m for 27 lithologic complete strata, and 7.6 m for 2 highly radioactive strata ware interpreted. Overall, our results show the potential of the geothermal reservoir as an energy source and pave the way for its utilization.
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Key words:
- Gonghe Basin /
- Guide /
- Zhacang geothermal field /
- dry hot rock /
- geophysical logging /
- high temperature geothermal
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