• 责任者：Yan Jiaxin (Key Laboratory of Biogeology and Environmental Geology of Ministry of Education ; China University of Geosciences ; Wuhan 430074 ; China ; Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education ; China University of Geosciences ; Wuhan 430074 ; China ) ; Ma Zhixin
• 刊名：Journal of China University of Geosciences
• 出版年：2008
• 卷期：19(5)
• 关键词：Permian ; fossil community ; habitat ; Sichuan
• 页码：p.441–450
• 图表：5 illus., 20 refs.
• issnNo：ISSN1002-0705
• isbnNo：CN42-1279/P

 Recent    achievement     in  hydrocarbon      exploration   in   Northeast    Sichuan demonstrated   that   Permian   calcareous   and   argillaceous   deposits   are   the   major   contributing   source rocks. Reevaluation on the hydrocarbon potential of the Permian strata over the whole Yangtze region is   thus   to   be   desired.   A  comprehensive   corroboration   was   carried   out   at   the   Shangsi Section Guangyuan, Northeast Sichuan, which is believed to be another promising area in South China. This article deals with the ecological and depositional conditions of the Permian strata in the section, including the Chihsia, Maokou), Wujiaping,and Dalong formations, which share  some     similarities  with   those  occurring    in  the  broad    Yangtze   carbonate    platforms.    Five  fossil communities of Mizzia-Permocalculus, Hayasakaia, Inozoan, Ostracod, and Crinoid were identified in the Yangtze region and described in detail including their components and occurrence. On the basis of the fossil communities and depositional features, 23 habitat types, mainly occurring from inner to outer shelves, were recognized at the Shangsi Section in order to reconstruct the depositional conditions and accordingly to evaluate the paleoproductivity. In addition, the subdivision of Chihsia Formation in the section    was   revised,   which   would    be  of   significance   for  the  reconstruction    of  the   Chihsian paleogeography in the study area.