Abstract:

Shanxi fault basin holds huge geothermal resources, especially in Jingweichang area, Yuci, where is the central of Shanxi basin. This paper applies CSMAT to look for geotherm in Yuci city in Jinzhong fault basin, and acquires the electronic structure in the depth. The collected data which have been calibrated through static correction and 2D inversion disclose the basement rock to be 500～750 m, and Ordovician lime top to be 200～2 700 m, and four hidden faults.Combined with CSAMT detects and geological data, one geothermal well is successfully completed with water temperature 95 degrees. The water quality is close to sea water. This work provides a geological reference to study the structural evolution.

Key words:  CSMAT, geotherm, fault basin, Yuci

摘要：

山西断陷盆地蕴藏着巨大的地热资源，榆次经纬厂一带位于该盆地中部，地热水资源非常丰富。应用CSAMT法在晋中断陷盆地榆次城区进行了地热勘查，获取了榆次经纬厂一带深部地层的电性结构。采集数据通过静态校正、2-D反演处理，最终确定榆次经纬厂一带基岩界面埋深500~750 m，奥陶系灰岩顶界面埋深2 000~2 700 m，勘探出未被揭露的4条隐伏断层。综合CSAMT探测结果与地质资料，确定了一眼地热井井位，通过钻孔验证，在该区成功打出第一眼深部地热井，水温95 ℃，水质分析含盐度接近海水。本次工作为该区地质构造演化提供了有意义的地质依据。

关键词: CSAMT, 地热, 断陷盆地, 榆次