Evaluation of Favorable Shale Gas Intervals in Dawuba Formation of Ziyun Area, South Qian Depression

A series of qualitative descriptions and quantitative analyses was used to determine the lithofacies characteristics recognize favorable shale intervals Dawuba Formation in Ziyun area South Qian Depression. The include core description scanning electron microscope (SEM) observation. X-ray diffraction, total organic content analysis, vitrinite reflectance, maceral composition, porosity, permeability, as well gas element composition. could be divided into four members. In general, first third members showed similarly high matter with most samples range 2–2.5% higher brittle mineral a quartz 40.53% 33.21%, respectively, compared other two members, content. However, member exhibited much porosity permeability than samples. Furthermore, chiefly composed methane (average: 83.63%), while that mainly consisted nitrogen 79.92%). Hence, should regarded target.