Accumulation Characteristics of Tight Sandstone Oil below Source Rocks and Its Major Controlling Factors:Fuyu Oil Layer in Da’an Area in Songliao Basin,NE China

摘要

1 Introduction Tight sandstone oil generally refers to the oil accumulated in tight sandstone reservoir rocks,with insitu permeability less than 0.1×10-3μm2(or surface permeability lower than 1×10-3μm2).Under normal conditions,there is no oil natural capacity in the well,or natural capacity is lower than the threshold of