Influences of high temperature and overpressure on the thermal evolution of organic matter in the Ying-Qiong Basins, South China Sea

On the basis of vitrinite reflectance data in 10 wells in the high temperature and overpressured strata, the Ying-Qiong Basins as well as an artificial pyrolysis experiment, the influence of high temperature and overpressure on the thermal evolution of organic matter for hydrocarbon generation has been investigated. The results suggest that high temperature has an important effect on the thermal evolution and hydrocarbon generation of organic matter and especially in areas where the source rocks were intensely influenced by deeply sourced hot fluids, and the rapid heating rate resulted in an advanced evolution of organic matter deposited in a shallower burial depth