Fracture System Assess in Beishan Grottos, Chongqing, China Based on Multiple Geophysical Data

As a country with a rich cultural and historical heritage, there are many grottoes in China. Unfortunately, many grottoes suffer from fracture seepage due to their age, causing weathering damage that requires prompt attention, detection, and repair to preserve them for future generations. In order to preserve the historical and cultural heritage of Beishan, Chongqing, China, this study illustrates how we assess the fracture seepage system of sandstone grottoes within the Penglaizhen Formation using multiple geophysical survey techniques. They are core data, conventional logging, borehole televiewer, and ground penetrating radar (GPR). Combining these methods, borehole televiewer and core data can improve the accuracy of conventional logging for stratigraphic delineation, as well as aid GPR in finding deep stratigraphic and seepage fractures. This study provides an effective routine to find sandstone grotto fractures and achieves positive results.