Research on Steam Simulation of the Formation and Gasification of Siliceous Rocks

The Nadan-Hatada formation developed during the Neogene Jurasic period and has been confirmed to contain light hydrocarbons. Through gold tube thermal simulation experiments, thermal degradation components analysis, and carbon isotope analysis, samples of shale from the Green River Formation in the Utah Basin and the Woodford Shale in Oklahoma were compared. The results showed that the gaseous hydrocarbons in the shale thermal degradation products mainly originated from the initial cracking of organic matter and the secondary cracking of liquid hydrocarbons. When the rumenite content was greater than 1%, the contribution of secondary cracking of liquid hydrocarbons to gaseous hydrocarbons was significant. The production of gaseous and liquid hydrocarbons in shale and stony shale thermal degradation products was mainly controlled by the type of organic matter. The highest gaseous and liquid hydrocarbon production was observed in the I type of mudstone, while the lowest was in the III type of stony shale. The δ 13 C value of gaseous hydrocarbons in the I type of mudstone showed a local inversion when the rumenite content was less than 1.2%. This may be an indicator of low thermal evolution degree of I type of mudstone and the secondary cracking of liquid hydrocarbons into gases.