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| Palynofacies of source rocks of Liushagang Formation in East Wushi Depression, Beibuwan Basin and its significance |
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REN Yongjun1, XU Zhiyao1, LI Fulai1,2, LIU Hongyan3, XU Xinde4, YANG Xibing4
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(1.School of Geosciences in China University of Petroleum, Qingdao 266580, China;2.Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;3.No.7 Oil Extraction Factory, Daqing Oil Field Company Limited, Daqing 163517, China;4.Zhanjiang Branch, CNOOC China Limited, Zhanjiang 524057, China)
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| Abstract: |
| Using the palynofacies analyzing method,this article first studied the origin and formation environment of organic matter of the source rocks in Liushagang Formation of Paleogene, Wushi Depression, and then evaluated the hydrocarbon generation potential of the region.The results show that the source rocks originated from low salinity lakes, and the bottom and top of the El2 oil shale formation correlate with the culmination of the lakes. For the El3 and the mudstone of the middle part of El2, the biogenic origin is mixed. For the oil shale of El2, the biogenic origin is the aquatic organisms. Lastly for the El1, the biogenic origin is the higher plants. The hydrocarbon generation potential of the source rocks is mainly influenced by the amorphous organic matter(AOM) content of the oil shale of El2, whose AOM content is the highest, has the greatest hydrocarbon generation potential, the E13 takes the second place, while the El1 has the least potential. |
| Key words: Wushi Depression Liushagang Formation palynofacies phytoplankton hydrocarbon generation potential |
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