Abstract：Mature and postmature source rock has an extremely low hydrogen and oxygen index, so it is difficult to identify its organic type from a Van paradigm of hydrogen-oxygen index. Nevertheless, organic matter of mature and postmature source rock is formed by the combination of various types of organic matters. The authors developed a distribution function combination method to identify organic type in the mature and postmature stage. The authors first developed a math formula of thermal evolution process, and converted samples from mature and postmature stage to immature and low mature stage. Then the authors built distribution function and synthetic organic matter distribution function of the hydrogen/oxygen index by linear combination method in a mature and postmature stage, and finally determined the type of the organic matter by the linear combination weighting in a mature and postmature stage.
李春鹏, 隋桂梅, 刘志国, 杨松岭, 闫青华, 尹川. 成熟—过成熟烃源岩有机质类型识别[J]. 物探与化探, 2017, 41(2): 219-223.
LI Chun-Peng, SUI Gui-Mei, LIU Zhi Guo, YANG Song-Ling, YAN Qing-Hua, YIN Chuan. Organic type identification for mature and postmature source rock. Geophysical and Geochemical Exploration, 2017, 41(2): 219-223.
