| 雄安新区深部岩溶热储探测与高产能地热井参数研究 |
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| 关键词:deep-seated geothermal reservoir exploration karst geothermal reservoir huge capacity geothermal well geothermal reservoir parameters Xiongan New Area |
| 基金项目:中国地质调查局地质调查项目(编号: DD20189112);国家自然科学基金青年基金(编号: 41602271);中国地质科学院水文地质环境地质研究所基本科研业务费(编号: SK201501) |
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| A Study of Deep-seated Karst Geothermal Reservoir Exploration and Huge Capacity Geothermal Well Parameters in Xiongan New Area |
| There are superior conditions of geothermal resources in Xiongan New Area in Hebei Province. The past exploration and development for geothermal resources in this area mainly focused on geothermal reservoirs at the depth of shallower than 1 800 m. It is an argent need to explore deep-seated karst geothermal reservoir so as to find high-quality geothermal resources. Based on D18 borehole 3 500 m deep situated in the south central part of the Rongcheng–Niutuozhen geothermal field, this paper expounds the methods, key discoveries and main parameters of karst thermal reservoir. The main conclusions are as follows: 1) the south central part of Rongcheng–Niutuozhen geothermal field with complicated geological structure is a favorable target for geothermal exploration and development, and the deep-seated karst geothermal reservoir consists of dolomite with flint-stripes and thick-chihsienella in Wumishan Formation of Jixian System; 2) there are 115 fractured karst zones at the depth of 2 120~3 500 m in D18 borehole, with the total thickness of 353 m and the porosity of 3.44%~39.8%, among which the dominant water-yielding strata are between 2 120 m and 2 300 m with the average porosity of 12.9%; 3) the temperature of D18 borehole at the wellhead is 93.1℃ during the pumping test, and the max temperature in the borehole reaches 95.05℃ at the depth of 2 120~2 300 m of high porosity, and the temperature profile in the borehole is typically inverted; it is supposed to result from intense heat convection in the depth; 4) the pumping test curve of the D18 borehole presents two-phase mixture features with water-gas; the pumping flow rate reaches 140 m3/h at water level drops of 12.1 m under the condition of the complete penetration well; and the heating potential by the single well would be 200 000 m2. All these data make D18 borehole the highest capacity geothermal well in thermal energy output in the whole area. |
| WU Ai-min,MA Feng,WANG Gui-ling,LIU Jin-xia,HU Qiu-yun,MIAO Qing-zhuang.2018.A Study of Deep-seated Karst Geothermal Reservoir Exploration and Huge Capacity Geothermal Well Parameters in Xiongan New Area[J].Acta Geoscientica Sinica,39(5):523-532. |
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