Experimental Study On Fluid Mobility Evaluation Of Tight Oil Reservoirs In Jinghe Oilfield

The practical significance of tight oil has more and more important with the development of petroleum exploration technology.Reservoir fluid mobility on the evaluation of reservoir quality and prediction of reservoir exploitability is of great significance.Therefore,it is important to study the relationship between fluid mobility and pore structure in reservoir evaluation.In this thesis,high pressure and constant velocity mercury injection experiments were carried out for tight oil reservoir cores of chang7 and chang8 sections in Jinhe Oilfield.Then the physical parameters and pore throat structure were analyzed.The results show that the relationship between physical property of tight reservoir and conventional reservoir is similar.However,the physical properties of reservoirs cannot be judged only by porosity and permeability,because the pore structure of tight reservoir is complexThe fluid mobility was experimentally observed with the combination of centrifugation and NMR,at the same time transformed the T₂ spectrum into pore size distribution by interpolation method.Comparing the converted data with capillary pressure curves and T₂ spectra.The correspondence among the three was good.The results showed that there was a good correlation between T₂ spectrum and pore throat distribution.Combining pore throat structure with centrifugal T₂ spectrum had already converted to aperture distribution.It is concluded that the main influencing factors of the fluid mobility in tight oil reservoirs are the radius of the pore throat and the connectivity of the pore throats.