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Depositional system of the Middle Permian Qixia Formation in the western Sichuan Basin

Wei Guoqi1,Yang Wei1,Zhu Yonggang2,Jin Hui1,Li Yuegang2,Shi Zhensheng1 and Shen Yuhong1(1.Langfang Branch of PetroChina Petroleum Exploration and Development Research Institute,Langfang,Hebei 065007,China;2.Northwest Sichuan Gas Mine of PetroChina Southwest Oil & Gas Field Company,Jiangyou,Sichuan 621700,China)  
Observation and analysis of numerous outcrops and cores as well as laboratory tests of samples from the Qixia Formation in western Sichuan Basin reveal that the formation mainly consists of bioclastic limestone,calcarenite,micrite,and leopard limestone.There are mainly three fossil assemblages,including brachiopods-algae-foraminifera,corals and thin shell brachiopods.They were formed in platform,slope and slope-basin environments respectively.Judging from geotectonic settings,bank features of platform edge and slope-basin facies,and the relationship between slope facies and platform edge facies etc,we conclude that the Qixia Formation in wes-tern Sichuan Basin is the carbonate-fringed platform depositional system with slope,platform edge bank and open platform as the main facies,of which the platform edge bank facies is widely distributed and the most favorable for hydrocarbon accumulations.
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