The Research Of Reservoir Characteristic Of East Yuaba In Northeast Sichuan Area

Based on the theory of Sedimentology and Reservoir Geology, a large number ofrelevant literature, the Core observation and relevant indoor analysis test data, wesystematically discuss reservoir characteristics and diagenesis of Xujiahe Formationof Upper Triassic in the Yuanba of northeast Sichuan Basin. And we finally expoundvarious controlling factors of reservoirs。There are five reservoir rock types, mainly including lithic sandstone and lithicquartz sandstone, feldspar lithic sandstone, followed by quartz sandstone, feldsparquartz sandstone and lithic feldspar sandstone, rich debris and poor feldspar,cuttingswith relatively high textural maturity and low composition maturity characteristics;Filler content in the main types of carbonate cements, siliceous cement and claymixed base; Lithic types is given priority to with sedimentary rock cuttings andmetamorphic rock debris, containing a small amount of magmatic rock cuttings.Reservoir of Xujiahe formation is mainly distributed in two sections of thesecond member and the fourth member of Xujiahe Formation. The second member ofXujiahe Formation own’s the highest Porosity, up to7.44%, The second better is thefourth member of Xujiahe Formation, at5.94%, the worst is the third member ofXujiahe Formation, only2.33%； Permeability aspect,the second member and thefourth member of Xujiahe Formation were similar, were0.03103-3μm2,the thirdmember of Xujiahe Formation is poorer,only0.014μm2。Studies the diagenesis in the divided into constructive diagenesis and destructivediagenesis, compaction and cementation are responsible for yuan river sandstone ofxujiahe reservoir dam area densification of the main factors; And constructivediagenesis in the dissolution of the crack is formed by the secondary pore and fractureto improve reservoir performance is the most important factor. Through the research achievements of predecessors and a large number of testand analysis data of northeast sichuan area, river rock stage for up rock B-late into C,mainly into rock B period.