Formation Conditions of the Dolomite Tight Oil in Fengcheng Formation of Fengcheng Area, Junggar Basin, Northwest China

1 Introduction Combined with the actual geological settings, this paper defines that the dolomite tight oil is the oil that occurs in tight reservoirs which has permeability less than lmD, which is interbeded with or closed to shale （Energy Information Administration, 2012; National Energy Board, 2011; Canadian Society for Unconventional Resources, 2011; Jia et al., 2012; Zhou et al., 2012）.