The shale gas exploration of the Longmaxi Formation in Yangtze Region China has made a significant breakthrough. As an important hydrocarbon generation organism, graptolite is widely distributed shales, but its potential still unclear. Taking shales Middle as example, this paper discusses organic petrological characteristics and contribution to buried carbon. study area can be divided into orga...

The shale of the Wulalike Formation developed in northwestern Ordos Basin is considered to be an effective marine hydrocarbon source rock. One key factors for successful gas exploration Wufeng–Longmaxi Sichuan high content biogenic silica. However, few people have studied siliceous origin shale. In this study, we used petrographic observation and element geochemistry analyze silica results show...