Study on the Acoustic Characteristics of Rocks and Fracability in Wunan Oilfield Guo Ziyi, Hu Yongquan, Zhang Yong, Xiong Tingsong, Mao Chun, Lin Hai, Wan Youyu and Liu Shiduo E3S Web Conf., 53 (2018) 03068 Published online: 14 September 2018 DOI: 10.1051/e3sconf/20185303068