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Controlling factors of tight sandstone in Silurian Xiaoheba Formation of Shizhu synclinorium and around area on the eastern edge of Sichuan Basin,China

WANG Yong,SHI Ze-Jin,ZHU Ping,HONG Cheng-YunState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China  
The authors chose the samples from four different sections in the same sedimentary micro-facies(sub-channel branch of delta front)in the Shizhu synclinorium and the around area on the eastern edge of Sichuan Basin,and analyze the controlling factors of the tight sandstone in the Silurian Xiaoheba Formation in terms of grain size,compaction,cementation,dissolution and the upgrowth of fractures.According to the analysis of the grain size,people don't think the sedimentary micro-facies can decide the character of the reservoir.Strong compaction and cementation are the main reasons that cause the reservoir tight,whereas dissolution and breakage can improve the physical property of the reservoir and they are the key factors for the high quality reservoir.Although the reservoir is tight in common,high quality reservoirs can still form in some favourable places.
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