Abstract:The hole NLSD 1 is the first scientific drilling deep hole in the Nanling region, which also is one of the deepest scientific drilling projects in metallic ore districts of China, and its final depth is 2967.83 m. In order to characterize the deep structural frame of the ore concentration area, reveal the distribution characteristics of the deep mineralization belt, establish the geophysical interpretation rule of deep ore prospecting, and improve the understanding of the laws of deep mineralization of deposit, this hole was implemented continuous coring, and conducted the measuring of a variety of geophysical logging and borehole geophysical methods in the drilling process. Ultrasonic imaging logging is an advanced logging technology, which contains abundant in situ geological characteristics information, often used to analyze the geological structure and in situ stress near the hole in the oil and gas exploration. This paper applied ultrasonic imaging logging to scientific drilling in metallic ore districts, studied the ultrasonic imaging logging data of hole NLSD 1, considered that ultrasonic imaging logging images which can characterize the geological features of fractures and fracture zones of the borehole wall, are also suitable for the structural interpretation near the hole in the metal ore exploration. All the main mineralized layers (409~429 m, 430~446 m, 621~641 m, 655~666 m, 679~691 m, 696~706 m, 744~759 m, 776~788 m, 907~921 m, 1031~1042 m, 1081~ 1090 m, 1430~1439 m, and 1440~1448 m et al.) were developed fractures or fracture zones, which indicated that the logging results can illustrate the depth of mineralized layers, and explained the spatial extension characteristics of west light and east deep in the mineralized layers near the hole. Based on the vertical variation of the fracture occurrence, we inferred that the intersection depth range of the fault F1 and hole NLSD 1 is 1375.32~ 1380.79 m. Besides, the study of the relation between fracture inclination and well deviation has guiding significance for drilling hole straightening. The study results indicate that the ultrasonic imaging logging plays an important role in deep ore prospecting.