Distribution Characteristics and Main Controlling Factors of Movable Fluid in Tight Sandstone Reservoir of Linxing Gasfield
To address the problem of complex microporous structure and unknown distribution characteristics and con-trol factors of movable fluid in the reservoirs of Linxing Area in the Ordos Basin,by comprehensively utilizing low-field nuclear magnetic resonance(NMR),field emission scanning electron microscopy(FESEM),X-ray diffrac-tion(XRD)analysis,nuclear magnetic resonance(NMR)imaging,and CT scanning,we quantitatively portrayed the saturation characteristics of the moveable fluids of the Upper Shihezi Formation and the Taiyuan Formation of the Linxing Gasfield,and analyzed the relations among the porosity,permeability,mineralogical composition of the rocks,microscopic porosity connectivity and the saturation of the moveable fluids.The results show that the average movable fluid saturation of the reservoirs of the Shihezi Formation in Linxing Area is 58.05％,and the average fluid saturation of the reservoirs of the Taiyuan Formation is 48.60％,and the average fluid saturation of the reservoirs of the Shihezi Formation is significantly higher than that of the Taiyuan Formation;the permeability and the percentage of porosity connectivity are the important factors influencing the movable fluid saturation of the dense sandstone res-ervoirs.The results of the study can provide a strong support for the understanding of permeability rules and the preparation of the development plan for dense sandstone reservoirs in Linxing Area.
tight sandstone gas reservoirsnuclear magnetic resonancemovable fluidsmain controlling factorsLinxing Gasfield
万方数据
维普
