Abstract:

The insulating layers of Xinglongtai dense oil horizon in Shuguang District,Liaohe Oilfields could be divided into three types such as mudstone,sandy mudstone,argillaceous sandstone.Their properties differ differently with each other.The argillaceous sandstone possesses the highest permeability then the sandy mudstone;mudstone has the lowest permeability but possesses the highest breakpressure;the argillaceous sandstone has the lowest breakpressure. As for thermal conductivity,specific heat and thermal expansion coefficient, mudstone is the highest and argillaceous sandstone is the lowest.According to the breakpressure,midvalue radius,permeability and thickness,the insulating layers could be divided into three types and six subtypes. Among all the seven layers in the study area,four of them are fine,two of them are secondary,two of them are poor.

Key words: insulating layer, characteristics, classification, complex assessment, Liaohe Oilfield, Xinglongtai oil horizon