Target area prediction and drilling verification of the tectonic fissure-hosted geothermal water in Meixian County, Guanzhong Plain based on the integrated geophysical exploration
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摘要: “双碳”目标背景下,地热能作为广泛分布的绿色清洁能源具有广阔的利用前景。构造裂隙型地热水因出水量大、易回灌等优势,成为当前水热型地热能开发利用的重要类型。运用区域综合物探方法,系统分析关中西部眉县城区区域构造、地层岩性、储水空间及富水性,指导热水井靶区预测和井位布局。结果表明,目标区发育3条隐伏断层,其中富水性好、规模较大的2条断层可以作为靶区断层,在此基础上将地热井布局于断层上盘靠近断层预测线的位置,垂向上沿着断层倾向方向钻穿基岩面风化带,结合断层和基岩面埋深等实际地质条件,该区地热井平均钻进基岩面以下500 m。钻井结果显示眉县地区二元结构热储发育,即新近系碎屑岩孔隙水热储和基岩裂隙水热储,完钻的8口地热井中7口井出水量超过100 m3/h,出水主要为基岩构造裂隙水,另1口井出水量较小,推测未取得基岩构造裂隙水,出水主要为新近系碎屑岩孔隙水。Abstract: To achieve the goals of peak carbon dioxide emissions and carbon neutrality, geothermal energy has great prospects for utilization as a type of widely distributed green and clean energy. The tectonic fissure-hosted geothermal water is regarded as an important type of hydrothermal energy for development and utilization because of its high water yield and easy reinjection. This study systematically analyzed the regional structures, formation lithology, water storage space, and water yield property of the urban area of Meixian County in the west of Guanzhong Plain through the regional integrated geophysical exploration, aiming to guide the target area prediction and well placement of geothermal wells. The results show that three concealed faults are present in the target area, of which two faults with favorable water yield property and large scale can be regarded as the faults of the target area. Based on this, geothermal wells were arranged near the fault prediction lines on the hanging wall of the faults, and the weathered zones of the bedrock surfaces were penetrated vertically along the dip angles of the faults. Given the actual geological conditions, such as the faults and the burial depth of the bedrock surface, the geothermal wells had an average drilling depth of 500 m from the bedrock surface. The drilling results show that there are dual-structure thermal reservoirs in the target area, including thermal reservoirs of pore water in the Neogene clastics and those of the bedrock fissure water. Among the eight geothermal wells, seven wells have a water yield of more than 100 m?/h, which mainly originates from the bedrock fissure water, and only one well has a relatively low water yield, which is mainly sourced from the pore water in the Neogene clastics.
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