沧东断裂(天津段)特征及导水导热性质分析

沧东断裂是华北平原区一条规模较大的隐伏断裂,经历了中、新生代两个裂陷旋回,一直为地热地质工作者所关注。人工地震表明:沧东断裂是一空间构造形态上陡下缓、走向北东、北部边界已沿至蓟运河断裂附近的大型拆离断裂。以水文地质理论为基础,对沧东断裂附近地热流体的水化学场、温度场特征的研究表明:沧东断裂在下部并不具备控制天津地热热源的构造条件,但断裂上部却具有明显的将深部高位热能以热对流形式向浅部传导的特征;在水力传导方面,除局部地段稍弱外,总体上沧东断裂带在水平和垂直方向上有较强的导水能力。

Haracter and Water-temperature Conductivity of the Cangdong Fault ( Tianjin Segment)

Cangong Fault is buried structure in Huabei Plain.Its tectonic evolvement went through 2 split-collapse cycles from Mesozonic to Cenozonic.Artifical earthquake study on it indicates that it is a large-scale fault with strike NE and inclination steep in upside and even in underside.And its north borderline gets to the Jiyunhe fault.The study on the hydrochemical field of geothermal liquid and temperature field around Cangong fault suggests that the underside of Congdong fault does not possess the structural conditions to control Tianjin geothermal source,but its upside has obvious character of thermal convection that can conduct the high quality heat source from the deep to the shallow part.On hydraulic conductivity,it has strong runoff ability on horizontal and vertical direction.