[Society of Exploration Geophysicists and Chinese Geophysical Society GEM 2019 Xi'an: International Workshop and Gravity, Electrical & Magnetic Methods and their Applications, Chenghu, China, 19-22 April 2015 - Xi'an, China (19 May to 22 May)] International Workshop on Gravity, Electrical & Magnetic Methods and Their Applications, Xi'an, China, May 19–22, 2019 - Study on electrical characteristics and mechanism of shale rocks in different sedimentary environments