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| Organic type identification for mature and postmature source rock |
| LI Chun-Peng, SUI Gui-Mei, LIU Zhi Guo, YANG Song-Ling, YAN Qing-Hua, YIN Chuan |
| CNOOC Research Institute, Beijing 100028, China |
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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.
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Received: 05 April 2016
Published: 10 April 2017
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