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Tuffaceous sandstone reservoir's microcosmic heterogeneity and major controlling factors of the Nantun-Ⅰ formation in Suderte area,Hailar basin

WANG Hong-yu1,ZHANG Xiao-long2,DUAN Zhi-yong3,WEI Dong1(1.School of Energy Resources,China University of Geosciences,Beijing 100083,China;2.Exploration and Development Research Institute,Jidong Oilfield Company,Tangshan,Hebei 063004,China;3.Logging Company,Great Wall Drilling Co.,Panjin,Liaoning 124010,China)  
Tuffaceous sandstone belongs to abnormal pattern reservoir that has low porosity and permeability,and has large distribution area in many sedimentary basins.This paper aims at describing the reservoir microcosmic heterogeneity characteristics and analyzing its major control factors,which is very important to this type reservoir's predication and development.Based on the comprehensive research of the cores,thin slices,SEM,mercury-injection data,and predecessors' research outcome of Suderte area in Hailar basin,we come to the conclusion that,compared with normal sandstone,tuffaceous sandstone has more pore types and more complicated pore texture because of pyroclastics composition mixing,and has severely micro-cosmic heterogeneity correspondingly.Sedimentary mircofacies types and tuffaceous origin of sandstone are the fundamental factors effected reservoir micro-cosmic heterogeneity because they decided the lithologic composition,diagenesis type and degree.With different relative content among crystal,shard and lithic in pyroclastic grain,or different relative content between pyroclastic grain and ash matrix,sandstone has different pore texture and physical property characteristics.Diagenesis plays a key part in aggravating reservoir heterogeneity.Compaction and cementation caused sandstone "low porosity and permeability" property.But tuff composition and content difference in sandstone increased diagenesis disparity in 3D dimension space,aggravating reservoir microcosmic heterogeneity correspondingly.
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