地学前缘 ›› 2020, Vol. 27 ›› Issue (3): 269-280.DOI: 10.13745/j.esf.sf.2020.3.1

• 非主题来稿选登 • 上一篇    下一篇

河北武城凸起地热田地热地质特征

王迪1,2,3(), 汪新伟2,3, 毛翔2,3, 武明辉2,3, 刘慧盈2,3, 张瑄2,3, 王婷灏2,3   

  1. 1.中国地质大学(北京) 地球科学与资源学院, 北京 100083
    2.中国石化集团 新星石油有限责任公司, 北京 100083
    3.中国石化集团 地热资源开发利用重点实验室, 北京 100083
  • 收稿日期:2019-10-11 修回日期:2020-01-02 出版日期:2020-05-20 发布日期:2020-05-20
  • 作者简介:王迪(1990—),女,博士研究生,矿物学、岩石学、矿床学专业。E-mail: wangd7707.xxsy@sinopec.com
  • 基金资助:
    中国石化集团重点科技项目“渤海湾盆地重点地区地热资源评价与开发技术政策”(JP19002);“中国典型地热田地热水水化学特征对比研究”(JKL18033)

Characteristics of geothermal geology of the Wucheng uplift geothermal field

WANG Di1,2,3(), WANG Xinwei2,3, MAO Xiang2,3, WU Minghui2,3, LIU Huiying2,3, ZHANG Xuan2,3, WANG Tinghao2,3   

  1. 1. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China
    2. Sinopec Star Petroleum Co.,Ltd, Beijing 100083, China
    3. Key Laboratory of Geothermal Resources Exploitation and Utilization, Sinopec, Beijing 100083, China
  • Received:2019-10-11 Revised:2020-01-02 Online:2020-05-20 Published:2020-05-20

摘要:

在“雄县模式”和环境压力的双重驱动下,河北地区已形成我国最大的地热供暖城市群。因此,研究武城凸起地热田地热地质特征,对河北省故城县地热开发具有重要的指导意义。本文通过测井、地震和区域地质资料,结合水化学特征、同位素测试结果的分析,系统分析了地热田的不同类型热储展布、储集层物性、地下热水补给来源和循环路径特征,并精细评价了地热资源量。结果表明武城凸起地热田热储类型主要为馆陶组砂岩热储和奥陶系岩溶热储。砂岩热储区域稳定分布,主要产水层为下馆陶组,底板埋深1 200~1 600 m,单井出水量79~123 m3/h, 井口水温52~54 ℃;岩溶热储有利区带主要分布在寒武—三叠系卷入的背斜核部,呈南北向带状展布,主要产水层为上马家沟组、下马家沟组和亮甲山组,顶板埋深2 100~2 900 m,单井出水量75~98 m3/h,井口水温82~85 ℃。地下热水来源为西部太行山脉和北部燕山山脉,热水沿着NE-SW向断裂破碎带和岩溶不整合面向上水平运移进入浅层热储,通过沧县隆起和邢衡隆起在武城凸起汇集,形成中低温地热田。地下热水质类型为Cl-Na型,最大循环深度为2 822.5~3 032.5 m,14C测年表明砂岩热储和岩溶热储年龄分别为21 ka和32 ka。明化镇组和石炭—二叠系分别为两套热储的直接盖层。武城凸起地热田地热资源量分层精细评价结果表明,热储地热资源量合计4.86×1010 GJ,折合标煤16.6×108 t。年可开采地热资源量可满足供暖面积1.1×108 m2,市场开发潜力巨大。

关键词: 武城凸起, 地热田, 砂岩热储, 岩溶热储, 资源量评价

Abstract:

Driven by the “Xiongxian model” and environmental pressure, the Hebei Province has become the largest agglomerate of urban geothermal heating in China. Therefore, studying geothermal geological characteristics of the Wucheng uplift can be significance for guiding geothermal development in Gucheng County, Hebei Province. In this paper, we studied the distribution patterns of different types of thermal reservoirs, as well as physical properties and characteristics of geothermal water recharge and circulation pathway of the reserviors, and performed geothermal resources evaluation, by combining logging, seismic and regional geological data with results of hydrochemical characteristic and isotopic analyses. The results showed that the geothermal field has two thermal reservoirs: sandstone and karst reservoirs. The former has a wide stable distribution, with the main aquifer situated in the lower Guantao Formation and a floor depth of 1200-1600 m. The geothermal water temperatures ranged between 52-54 ℃, and the well water yield was 79-123 m 3/h. The favorable zones of karst thermal reservoir are mainly distributed in the anticlinal core of the Cambrian-Triassic, extending in a N-S zonal direction, with the main aquifer in the upper Majiagou, lower Majiagou and Liangjiashan Formations and a roof depth of 2100-2900 m. The geothermal water temperatures ranged between 82-85 ℃, and the well water yield was 75-98 m3/h. The geothermal waters originate from the recharge areas of the Taihang mountains to the west and Yanshan mountains to the north, moving horizontally along the NE-SW fracture zone and the karst unconformity plane into the shallow thermal reservoir, from where they meet in the Wucheng uplift, through the Cangxian and Xingheng uplifts, to form a medium-low temperature geothermal reservoir of Cl-Na type water quality. The 14C dating results indicated that the geothermal waters of sandstone and karst reservoirs were 21 ka and 32 ka, respectively, with a recharge depth of more than 2822.5-3032.5 m. The Minghuazhen Formation and the Carboniferous-Permian strata are cap rocks of the two thermal reservoirs, respectively. According to a fine evaluation of Wucheng geothermal resources, the total geothermal reserves amount to 4.86×1010 GJ, equivalent to 16.6×108 tons of standard coal. The annual geothermal exploitation can meet 1.1×108 m2 indoor heating demand, demonstrating a huge geothermal developmental potential in the region.

Key words: Wucheng uplift, geothermal field, sandstone thermal reservoir, karstic thermal reservoir, resources evaluation

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