综合物化探方法探测沙湾隐伏断裂带中段

THE APPLICATION OF GEOPHYSICAL-GEOCHEMICAL METHOD TO THE DETECTION OF THE CONCEALED FAULTS IN MIDDLE SHAWAN

沙湾断裂带是珠江三角洲内的一组NW向断裂带,出露较少,以隐伏为主。在本次隐伏断裂探测过程中,采用了浅层地震反射波法、高密度电法及土壤氡气法,对沙湾断裂带中段隐伏断裂——大乌岗断裂、沙湾断裂、陈村断裂、紫坭断裂进行了综合探查,共发现7处异常,初步查明沙湾断裂带的通过位置等几何信息,为进一步进行钻孔验证奠定基础。

The Shawan fault zone in the Pearl River delta consists of a group of NW-striking faults, discontinuously exposed and con- cealed. In the detection of this group of faults, the authors adopted the integrated geophysical-geochemical method comprising geophysi- cal survey, shallow seismic reflection method and high-density electrical method as well as geochemical survey. Integrated survey was conducted for 4 concealed faults （ Dawugang fault, Shawan fault, Chencun fault and Zini fault） which belong to the Shawan fault zone. During the detection, 7 anomalies were delineated, and geometrical information concerning the fault position was preliminarily ob- tained, thus laying the foundation for drilling verification.