APP下载

浅析西安市西咸新区泾河新城地热资源开发与利用

2018-04-03李四龙叶强

李四龙 叶强

【摘 要】2015年下半年,在西安市西咸新区泾河新城成功钻凿了一口地热井,查明了该地区的地层情况及热储条件。地热井成井水温86℃,通过大、中、小落程进行放水实验,評价单井可开采量为213.51m3/h;通过计算求出开采权益保护范围半径1816.14m,开采影响区直径为3632.28m;该地热井井深2750m,开采层为新近系蓝田灞河组下部,高陵群,古近系地层。

【Abstract】In the second half of 2015, a geothermal well was drilled successfully in Jinghe Xincheng, Xixian New Area, Xi'an City, and the formation condition and geothermal reservoir conditions in this area were found out. The water temperature of the geothermal well was 86 ℃. Through the experiment of large, medium and small drop, the recoverable capacity of single well is estimated to be 213.51 m3/h, through calculation, the radius of protection range of mining rights and interests is 1816.14m, and the diameter of the mining influence area is 3632.28m. The depth of the geothermal well is 2750 m, and the exploitation layer is the lower part of the Neogene System Lantian Bahe Group, the Gaoling Group and the Paleogene System.

【关键词】地热井;热储;井温

【Keywords】 geothermal well; geothermal reservoir; well temperature

【中图分类号】P62 【文献标志码】A 【文章编号】1673-1069(2018)03-0141-02

1 区域断裂构造

泾河新城位于渭河盆地内。该地区发育有泾河断裂(F1)、渭河南岸断裂(F2-1)、渭河北岸断裂(F2-2)、现将区内断裂分述如下。

泾河断裂(F1):该断层走向东西,倾向北,视倾角78°,性质为正断层,切穿第四系底界面。该断层为地层深部热源上涌提供了有利通道,但该断层为地热井施工造成一定的风险。

渭河南岸断裂(F2-1):该断裂大体沿渭河一级阶地前缘展布,经曹家堡,过草滩镇南,至八家村方向作北东东方向延展,倾向北西,为一条隐伏断层。其位置与渭河南岸断层位置相符。该断层倾角85.5°,断距随深度增加而增大,破碎带宽约135m。

渭河北岸断裂(F2-2):该断裂位于渭河北岸,西起咸阳吴家堡,向东经石家台、窑店、过马神庙北、插向泾河,总体作北东东向延展。断裂上陡下缓,倾角65~80°,总体向南倾斜,切深大于20km;但在局部地段(如窑店附近)断裂在纵深方向上发生折曲,2km以浅倾向北,以深则转向南倾。

2 地层特征与热储和盖层

地热井自上而下钻遇:第四系秦川群(Q2-4qc)、三门组(Q1s)保温盖层,新近系上新统张家坡组(N2z)、新近系上新统蓝田—灞河组(N2l+b)、新近系中新统高陵群(N1gl)、古近系(E)四个热储层。……

登录APP查看全文