| 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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| 引用本文：吴爱民,马峰,王贵玲,刘金侠,胡秋韵,苗青壮.2018.雄安新区深部岩溶热储探测与高产能地热井参数研究[J].地球学报,39(5):523-532. |
| DOI：10.3975/cagsb.2018.071104 |
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| 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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| 中文摘要:河北雄安新区地热资源条件优越, 以往的勘查开发层位主要在1 800 m以浅, 探测深部岩溶热储, 寻找高品质地热资源是支撑服务新区规划建设的迫切需要。本文以位于容城—牛驼镇地热田中南部的D18孔为依托, 阐明了3 500 m深度的岩溶热储探测方法、重要发现和主要参数。主要结论为: (1)容城—牛驼镇地热田中南部地质构造复杂, 是地热资源勘查开发的有利目标区, 深部岩溶热储由蓟县系雾迷山组含燧石条带、巨厚叠层石白云岩组成; (2)D18孔在2 120~3 500 m深度共发育115个岩溶裂隙带, 岩溶裂隙总厚度353 m, 孔隙率3.44%～39.8%, 其中2 120～2 300 m为主要出水层, 平均孔隙率12.9%; (3)D18孔孔口水温93.1℃, 孔内实测最高温度95.05℃, 温度峰值出现在高孔隙率发育的2 120～2 300 m孔段, 推测由深部热对流机制造成; (4)D18孔抽水试验曲线具有水-汽二相混合特征, 完井抽水流量140 m3/h, 单井供暖潜力达20万m2, 为目前发现的雄安新区范围内产能最大地热井。 |
| 中文关键词:深部热储探测 碳酸盐岩热储 高产能地热井 热储参数 雄安新区 |
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| A Study of Deep-seated Karst Geothermal Reservoir Exploration and Huge Capacity Geothermal Well Parameters in Xiongan New Area |
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| Abstract: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. |
| keywords:deep-seated geothermal reservoir exploration karst geothermal reservoir huge capacity geothermal well geothermal reservoir parameters Xiongan New Area |
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